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Jhep04(2015)172

Jhep04(2015)172

JHEP04(2015)172 Springer April 7, 2015 April 30, 2015 : March 20, 2015 -jets from the : missing trans- January 7, 2015 b : : of two Accepted Revised an be considerably re- Published Received 10.1007/JHEP04(2015)172 st four jets, and requiring nt. We propose benchmark spite the reduced MET, this doi: 3, no masses, and in their decay I of the LHC at 13TeV centre rance , ntegrated luminosities, depending Published for SISSA by [email protected] , c . 3 and Ana M. Teixeira 1412.6394 a,b The Authors. c Phenomenology

In the presence of a light singlino-like LSP in the NMSSM, the , [email protected] - from one Higgs decay, we find that the invariant mass τ E-mail: 91405 Orsay, France School of Physics andHighfield, Astronomy, Southampton University SO17 of 1BJ, Southampton U.K. Laboratoire de Physique Corpusculaire, CNRS/IN2P3Campus - des 24 UMR C´ezeaux, Av. 653 des Landais, F-63171 F Aubi`ere, LPT, UMR 8627, CNRS, Universit´ede Paris–Sud, b c a ArXiv ePrint: search strategy allows to see signalson for the sufficiently squark/gluino large masses. i Keywords: other Higgs decay shows clear peaks above the background. De points for such scenarios, whichcascades. differ Events in for the these squark pointsof and are mass glui simulated energy. for After thetwo run cuts I on the transverse momenta of at lea verse energy — METduced. — Instead, signature a pair of of squark/gluino Higgs production is c produced in each eve Excessive Higgs pair productionsquarks with and little gluinos MET in from the NMSSM Open Access Article funded by SCOAP Abstract: Ulrich Ellwanger JHEP04(2015)172 . 1 3 6 8 X 11 LSP , for M − NLSP ]. In particular, M ] which depend, 7 3 – – 4 f mostly 8TeV, no +LSP of a sparticle 1 X SM), ATLAS obtained plete sparticle spectrum. → l (assuming conserved R- enotes the Next-to-lightest (MET) due to the escaping ound in [ SP already put the MSSM under etric (sparticles) like ood dark candidate if production. (Decoupled , for similar squark and gluino ics beyond the orresponding to one squark plus miss T of the of the first two generations; tops and sbottoms, respectively. E few GeV) and, simultaneously, ∼ close to (just below) and decay cascades motivated by the X ˜ g LSP M M M final states are applied, these searches are less effective if, – 1 – − τ miss T + E τ + b ¯ b , gluino masses ˜ q M ]. Weaker limits are obtained within simplified models where 8 masses 1 7 TeV [ . 1 ∼ > ˜ g M This is the case if the LSP is very light ( Searches for squarks, gluinos and sparticles rely in genera Lower bounds on the masses of sparticles have been obtained [ ∼ Subsequently we use the notion “squark” for the scalar partners 1 ˜ q supersymmetric .) decay chain is always soft and carries little energy. (NLSP d for kinematical reasons, the LSP produced in the last step NL stable lightest supersymmetric particleneutral. (LSP), Since which corresponding is cuts a on g parity) on events with large missing transverse energy corresponds to a Standard Model particle, with instance, gluinos are assumed to begluinos decoupled imply in reduced the case squark of productionmasses, s the cross largest sections production and crossone sections gluino are production.) the ones In c anya case, certain these stress. lower bounds have however, on the sparticleRecent decay summaries cascades of bounds and withinfor hence various similar on scenarios the can squark be com f the scalar partners of top and bottom quarks will be denoted by s After the firstsignificant run excesses of have been the observed(SM). LHC in Amongst searches at others, for this a phys concernssquarks, centre searches gluinos, for of supersymm electroweak mass and (c.m.) . energy o 1 Introduction 3 Extraction of signals in 4 Signals for benchmark points 5 Summary and conclusions Contents 1 Introduction 2 Scenarios with little MET in the NMSSM Minimal Supersymmetric extensionM of the Standard Model (MS JHEP04(2015)172 , ]. ]. 9 miss 26 T miss T – E E , most 23 ], or the LSP additional 12 with subse- icle decays, M terms in [ is played by ) ∗ ( due to a light X Z ) ∗ ( miss T t the LSP has only ers from the MSSM E , always leading to a /Z nsion of the Standard ) been studied before in ∗ X e MSSM-like sparticles nant limits on such sce- ], but the emphasis was ( -like LSP happens inside all sparticle masses below k and gluino masses from 57 W to 125 GeV + osons. Since these can be ) , ∗ ], and renders more natural ( ly coupled to the MSSM-like the NMSSM was also briefly ated due to the other decay 46 ], so-called photini [ t their decay cascades end up . Only subsequently does the ve to standard supersymmetry nto the LSP, skipping the step 16 o-like LSP could be in principle W , ino, the fermionic component of 11 esulting jets have been proposed ], while preserving the attractive ]. The possible reduction of , 41 ]. The role of the “true” LSP can 9 , ] is that the role of 22 58 14 – – 40 14 – s) into 9 17 52 (but not ruled out by LEP). Such light . BR Z M miss T E – 2 – is the 125 GeV Higgs , although additional X leading to . decays generate boson) could also play that role. In the general MSSM ) -problem of the MSSM [ ∗ Z ( µ ] and the NMSSM [ 51 ,Z ) – ∗ ( ]. 27 , W 14 actually originate from searches for many hard jets as in [ 12 solves the miss T S E ] and in a variant of the NMSSM including non-renormalisable 125GeV of the SM-like [ + LSP. However, if this step is not present in nearly all spart 10 ]. ∼ 61 X ] we studied in detail to which extent the reduction of ] where the coupling of the two Higgs doublets of the MSSM to an – 14 15 → 59 , The production of Higgs bosons from cascades has Scenarios of that kind have been discussed in [ In [ The NMSSM denotes the Next-to-Minimal Supersymmetric exte On the other hand, in extensions of the MSSM it is possible tha 45 1TeV, but consistent with constraints from the LHC. The domi which makes corresponding scenarios somewhat moresearch sensiti channels. quent leptonic decays of due to a softer LSP in such decays was observed in [ in [ mainly on neutralino decaysconsiderably boosted, as analyses additional of the sources substructure of of the Higgs r b One particular feature of the scenario presented in [ features of thethrough MSSM. the presence Besides of the anthe additional Higgs singlet neutralino superfield). sector, (the singl The thesparticles. singlino NMSSM can A be diff scenario adiscussed with light in LSP, such [ weak a soft singlino-like LSP in singlino of the NMSSM [ Model [ gauge singlet field a value of be played by athe light detector — (provided otherwise the it decay behaves like of the the true MSSM LSP) [ squarks (and sleptons) would thenNLSP prefer to decay directly i A possible Standard Model particle singlino in the NMSSMthe can run alleviate I the of lower the∼ bounds LHC. We on presented squar a “worst case scenario” with soft LSP for configurations of masses as stated above. “MSSM-like LSP” (now the NLSP) decay into the “true” LSP + weak couplings to(squarks, all gluinos sparticles etc.) present avoid(provisionally) direct in in decays the the into “MSSM-like MSSM. the LSP”, LSP, Then bu typically th the bino non-SM-like Higgs bosons (or the narios with little such a scenario cannot be realisedvery in light practise: and whereas a a wino- bin or -like NLSP have a mass close variants of the MSSM [ Higgs bosons have very small branching ratios ( existing lower bounds onprocesses with sparticle an masses energetic are LSP and hardly large allevi a NMSSM-specific Higgs boson lighter than JHEP04(2015)172 w miss T hter NLSP E M ] on final . Instead, , and prac- he effective 14 in all decay miss T LSP E miss + LSP. (Decays T M ], a loss of . The “worst case E + H 14 SM H asses in the 1-1.5TeV , would be difficult to → hmark points differ in H M study benchmark points and jets. Here we study nding benchmark points ly possible in the general l in [ miss & T analysis and the dominant als of two Standard Model- ons, E ], on the possible excessive t on the final signatures). In r in the NMSSM if a domi- miss T ades is always assumed to be m. energy run II at the LHC. gnals of two Standard Model- and, accordingly, a bino-like r masses are assumed to be E ing via gluinos and/or gluinos 14 mostly bino-like NLSP on large cuts on hmark points and discuss which NLSP arios. Section 5 is devoted to a p NLSP 125 M H + singlino cascade and, moreover, it X → – 3 – ] is relatively small, which we do not assume here is still strongly reduced, making standard searches for 15 in the bino above the background, concentrating as in [ 1 can be extracted (above the Standard Model background) miss T H E SM directly decay into quarks and the bino in order to alleviate SM ] (in order to reduce as much as possible H q H pair, the invariant masses of the latter near the Higgs mass. ] relied, for reasons stated above, on the production of a lig 14 b ¯ 14 b corresponds to a NMSSM-specific Higgs scalar with a mass belo H of the NMSSM [ and a s eff ′ µ τ +singlino, hence + LSP occur only if the NLSP has a higgsino component, i.e. if t Z SM H → → was investigated in [ To this end we present benchmark points with squark/gluino m The case where In the next section we present the scenarios and the correspo In the present paper we concentrate, in contrast to [ parameter 750GeV (the precise values of their masses have little impac Z µ NLSP tically all sparticle decay cascades terminate by a last ste range, which arethe not excluded decay by cascades;∼ searches if from stops/sbottoms run appear I. therein, The thei benc like 125 GeV Higgs bosons each case we perform simulations and attempt to extract sign is somewhat above the sum of a Higgs and LSP masses observe in standard supersymmetry search channels relying NLSP mass somewhat above 125 GeV,NMSSM. as The main such purpose scenarios of arefor the equal present squark/gluino paper production is to which, propose due and to the reduction of in order not to miss squark/gluino production at the 13TeV c. M As described in(associated the to Introduction the and LSP)nantly in discussed singlino-like sparticle LSP in decay is more cascades light, detai the can mass occu of the typically of their properties cansummary help and to conclusions. distinguish the various scen 2 Scenarios with little MET in the NMSSM in more detail.backgrounds. In In section section 3 4 we we collect the describe results the for the simulations, benc the scenarios” discussed in [ supersymmetry less efficient. The aimlike is then 125 GeV to see Higgs whether bosons si processes); here we consider the Standard Model-like was assumed that squarks ˜ for simplicity.) states with 2 production of pairs of Standard Model-like 125GeV HiggsNMSSM-specific bos Higgs boson scenarios with longer squarkdecaying decay via cascades: stops/sbottoms. squarks The decay finalbino step in the decay casc as much as possible the constraints from searches based on JHEP04(2015)172 ] ≪ 64 miss T ) E LSP LSP de- 150 GeV merits a NMSSM- M s (possibly ]. ∼ → = 125 GeV, + miss T 66 H H , E M M 65 ( f parameters of the − squark/gluino masses below. Hence we do not (using CheckMATE [ fractions of the involved rated luminosity — such 1 TeV, taken re squarks decay via glu- NLSP ts P1 — P8 are shown in ransverse momenta of the lowed, 2-body decays into y their squark ∼ eproduced at least approx- ch this chain is as short as M uino are unstable under ra- = 130 GeV, airs of the first two genera- luinos heavier than squarks on instead of are squark mass parameters.) ark-antisquark, squark-gluino ightly heavier than — almost ks of the first two generations companied by hard jets. harginos or heavier + LSP. Direct production of er than squarks can undergo 3- into the bino-like NLSP and the NLSP ]) while the squark/gluino masses 125 xcept for the anomalous magnetic M 14 H as we have checked using we choose values such that the bench- ose from flavour physics (B decays). BR ˜ g 2 → M is not very sensitive to the masses of the 4TeV for P2. Both squark and gluino pro- bosons can lead to neutrinos, and the . 1 Z +LSP as long as miss T ∼ – 4 – E or H ± → W as obtained from Prospino at NLO [ tot σ and gluino masses for the decay NLSP ˜ q M BR ]. ’s is often sufficient to make standard supersymmetry searche ν 63 , 62 [ ] it was found that the loss of 14 , and we verified that this also holds for the signals obtained = 3 GeV and 100% 4.4.0 The subsequent benchmark points will not be defined in terms o Points P1 and P2 are examples of short decay chains; for P1 the In [ For the squark masses The benchmark points considered here include scenarios whe This also ensures that all phenomenological constraints (e 2 NLSP LSP duction contribute to theare assumed total to production decay crosstions, democratically section. and into squarks all G lighter squark-quark than p gluinos with 100% separate analysis. including isolated leptons)or sensitive heavier to neutralinos these with scenarios. subsequent Higgs pair producti NMSSM but, for convenience,sparticles. in terms However, of these masses areimatively and chosen branching by such suitable that they parameters can of be the r NMSSM from the latter vary these masses and choose for all benchmark points mark points are not ruled out by searches at the run I at the LHC are slightly above the lower bounds from thehave LHC somewhat more run pessimistic I values (i.e. of for the standard supersymmetry searchare channels). assumed All degenerated. squar As stated above, the points differ b Tools moment) tested in NMSSMTools are satisfied, in particular th M M and gluino-gluino cross sections heavier than in the “worst case scenario” studied in [ possible: decoupled stops anddegenerate sbottoms, with and — squarks. gluinos onlydiative (Squarks corrections sl much and lighter would than imply theThe an gl unnatural squark, tuning gluino of and b table stop/sbottom 1, where masses we of also include the the eight sums of poin squark-squark, squ cay chains, and for completeness we start with points for whi top-stop or bottom-sbottom pairs. Decayare chains left involving aside c here as their decays via scenarios are observable in searches for two Higgs bosonsinos, ac leading to more(s)particles jets involved in in the thebody final last state decays decay into but step. two with Gluinos quarks reduced light and t a bino or, if kinematically al we show that — for not too heavy squarks and large enough integ particles involved in the decay NLSP JHEP04(2015)172 d ∼ ) into 0 2 arge, qχ ut left- 100%. BR → ∼ R ) q 0 2 (˜ qχ BR ain, right-handed → nd the correspond- [fb] 168 169 168 920 169 321 q 1645 1874 (˜ on the stop/sbottom ghter than gluinos, in tot ∼ ∼ ∼ ∼ ∼ ∼ top or sbottom masses ∼ ∼ σ r than squarks: for the BR ghter than squarks. Now ecay with 100% ) in order to be compatible ) and the sum of squark-gluino re defined. r production to the signals. s discussed below) and would gluinos and the corresponding e signal rates also remain valid [GeV] ino masses have to be somewhat –P8. b ˜ : 750 : 750 : 750 : 750 M ˜ ˜ t t b b ˜ ˜ ) into gluinos and the corresponding 100% (P6), and squarks decay with M M M M or ∼ decoupled decoupled decoupled decoupled ˜ BR t = 750GeV to comply with current LHC ) b ˜ M b ˜ b ˜ t, . Hence, instead ofM varying the stop/sbottom → – 5 – g top (˜ m [GeV] 900 1010 1410 1300 1410 1110 1300 1200 ˜ g BR − . ˜ g 0 2 M M q χ → into gluinos and the corresponding quarks, to allow for gluino 2-body decays. As before, gluinos can be ˜ 100% into gluinos. Herewith all relevant masses (summarise q [GeV] q 1500 1400 1100 1500 1400 1000 1400 1100 ∼ ˜ q top BR 100%, while right-handed squarks, due to the larger hyperch → M m 100% (P5) or 70%. g ∼ BR − ∼ ) ∼ ˜ g ˜ g ) of 30% into the bino-like NLSP and the corresponding quark, b ) ˜ t q ˜ t M g P4 P5 P6 P7 P8 P1 P2 P3 q Point → BR → → L g q (˜ R (˜ into the bino-like NLSP and the corresponding quark, q of about 30% (assumed to be precise) into the bino-like NLSP a (˜ BR . Squark, gluino, stop and sbottom masses (unless decoupled BR BR BR BR For the points P7 and P8, gluinos are lighter than squarks. Ag Points P5 and P6 correspond again to gluinos slightly heavie For the remaining points P5–P8 we assume stops or sbottoms li Points P3 and P4 correspond to scenarios where gluinos are li in table 1) and branching fractions of the benchmark points a handed squarks with squarks are assumed to decay partially (with 70% quark, with a 100% masses, we choose a sufficiently large value, gluino, top + stopmasses, or provided bottom these are + below sbottom, the signals depend very little decrease even further forfor heavier stops/sbottoms; heavier stops/sbottoms. hence th limits, but weThese neglect contributions contributions are found from to stop/sbottom be very pai small (after the cut slightly heavier or lighter than squarks,larger but (depending squark on and glu whetherwith we the have light limits stops fromshould or the be sbottoms run large I enough. of the We LHC. observed For that, the as same long reason, as s gluinos d fact lighter than quarks one can assume that the left-handed squarks fully decay into Table 1 have ing quarks, leaving 70% 30%, corresponding quark: ˜ production cross sections at NLO for the benchmark points P1 JHEP04(2015)172 algo- f the ]. Jets ] where T ]. (The k 69 14 66 , 65 leptons and at τ re rich in hard jets, on the squark/gluino er cascades, with the cay directly into the -tag efficiency of 70% ]. A similar approach, b of the Standard Model osons, as is the case of 61 s clarified in comparing next-to-leading (red) Higgs ion DELPHES [ – re performed by means of squark-gluino production.) eading Higgs bosons of the 59 ulation; the production cross , ble — is achieved (see below) ered. However, we found that ospino at NLO [ cally decaying 45 panel). ] for showering and hadronisation. no, squark-antisquark and gluino- 68 collisions at 13TeV are simulated using final states pp 40GeV and assume a − τ > – 6 – 15 jets for each event, was employed in [ + T . p τ = 0 + b R ¯ b ] (part of the Delphes package) using the anti- 70 : the masses of the originally produced squarks and gluinos 1 ] which includes Pythia 6.4 [ -jets of 10%, and from light quark/ jets of 1%). c 67 ].) 73 , 4TeV for P2, 1.3/1.5TeV for P7), but the transverse momenta o . -tagged jets we require 72 b 1 ∼ -tagged jets. b ]. For . Spectra of the transverse momenta of the leading (blue) and 71 In principle, the decay products of strongly boosted Higgs b The average transverse momentum of the Higgs bosons depends For the analysis we try to profit from the fact that the events a rithm [ point P2, can be analysed using substructure methods [ based on the construction of “slim” only scenarios with short squark decay cascades were consid are similar ( were constructed by Fastjet [ The emission of one additionalsections hard jet for was the allowed four ingluino the distinct sim production squark-squark, processes squark-glui weredominant obtained contributions separately always by come Pr The from output squark-squark was and given in StdHEP format to the detector simulat MadGraph/MadEvent [ MadAnalysis 5 [ leading Higgs bosonNLSP, peak but near somewhat below 700GeV 400GeVsquarks for decaying for P7, P2, into in gluinos where which and squarks one stops. finds de long (These analyses we Figure 1 Events due to squark/gluino production from the spectra of thepoints transverse P2 momenta and of the P7 leading in and figure subl masses and, notably, on the length of the decay chains. This i 3 Extraction of signals in bosons for the benchmark points P2 (left panel) and P7 (right least two background — keeping the signalif acceptance we as require large that as signal possi events contain at least two hadroni (mistag efficiencies from and each event contains two Higgs bosons. A strong reduction JHEP04(2015)172 > ical . fake from . The miss T τ 2 -decays E b 300 GeV, spectrum om QCD. 4 jets has e system.) . > of 30 GeV. . Especially miss T = 0 E miss T miss T R E E ard 400 GeV, -tagged jets which are b > vents with less boosted ut on T spectrum becomes harder e ones with large average P , the softest rate some h are shown in figure ds to satisfactory results. h channels with sizeable cuts miss T ’s in the final state implies that E from leptonic top decays can be τ ay cascades, which typically lead of the two o he miss T bb 4, and require at least two such jets . E M neutrinos. In addition, leptonic = 0 τ R – 7 – fake rate (and notably the unusually large 2- τ 40GeV were required, and a small lower cut on > T for the benchmark points P3 (left panel) and P7 (right panel) P miss T are quite soft for all the benchmark points due to the kinemat 100GeV for the 4 leading jets, respectively. E -tagged or not) with transverse momenta > miss T b ]) is much smaller, which helps to suppress the background fr -jets with E 100GeV, but if such cuts were imposed, then most of the events b 14 ∼ > . ( inside such jets are added to the invariant mass of th R . Spectra of miss will always be due to the escaping T E , 200 GeV and miss T -tagged. Then we define the invariant mass b E At least 4 jets ( > 30GeV was applied. At least two miss T Compared to analyses based on slim jets, the use of more stand In our analysis the following cuts were applied: We construct jets with a jet cone radius The spectra of • • Figure 2 E closest in ∆ for cascades via top quarks, as in points P5 and P7, This simple approach workstransverse for momenta all of benchmark HiggsHiggses points; whose bosons even mass lead can th to be reconstructed sufficiently this many way. e rate observed in [ relatively large. Finally, also for short decay cascades, t for heavier squarks and gluinos. Among the benchmark points the additional advantage that the is observed for the point P3, the hardest for the point P7. Bot the latter approach fails for scenariosto with less long boosted squark Higgses. dec Instead, a more standard method lea point P7 could possiblyon also be discovered in standard searc (from Higgs decays or cascades via stops/sbottoms) can gene points like P3 would be missed. Hence we use only a mild lower c to be reasons discussed in the Introduction. Still, requiring tw some JHEP04(2015)172 ’s). We ’s), and τ τ s for circa , but also to at, given the bb osed to be above M ’s depends on their for these points are τ eV Higgs boson into ctically pure singlets asses below 125GeV. ts of 5% of all signal events n the couplings of such . bottom pair production rd jets (see above), two ions to the signal region production, possibly to- 5 vel (and two fake utions to the signal region on of four bottom quarks; ir production, also possibly and possibly fake e that the acceptances are ∼ About 0.33% of the top pair rlying sparticle spectrum. d to originate from 65. Hence the acceptances for ints, the signals of Higgs bosons . 0 06fb. Comparing the signal cross ... 160GeV was defined; not only this . 30fb (P4), i.e. all are well above the 0 . < 35 0 63%, only . ∼ 0 bb 031fb from bottom pair production, i.e. ∼ ∼ . ∼ 0 ’s). τ ∼ < M ’s are required, with invariant masses ranging – 8 – τ are dominated by the requirement of 2 hadronic 3 ), hence on the kinematics of their production. For ) − T P 10 → × 3 fb (P3) and . -quarks with an invariant mass in the signal region. The τ 1 b ( bosons together with bottom or top quark pairs. All SM after the cuts described in section 3 are summarised in ∼ Z BR bb fb. 3 M − ’s, and 2 ’s satisfying the criteria of our cuts, while this only occur τ ’s from τ τ ’s from Higgs decays. The efficiency for hadronic 7% and (improving with τ 35 fb (P2), T . ∼ 0 P , increasing with increasing squark/gluino masses. Note th ) 3 ∼ τ − 2 10 → × for the points P1–P4. The cross sections in the signal region 029fb from top pair production and . 3 125 (Additional Higgs bosons with massesto below 60GeV avoid constraints must from be LEP, pra such and pairs to which avoid would decays of reducelight the its additional 125G observed Higgs signal bosons rates. to a The bino must be very small.) remain sensitive to possible additional Higgs bosons with m allows to take into account uncertainties in the measuremen from 20GeV to 160GeV,100GeV the (which sum further of suppresses their fake transverse momenta imp Finally a (large) signal region 60GeV At least two hadronically decaying 0 H 1 fb (P1), First, the spectra of 06fb all together. The sum of all other background contribut . ( . • • ∼ 3 0 figure energy and their contain 2 hadronic the benchmark points we have an efficiency of the benchmark points of about 1-2 ∼ BR was found to be below 10 pair production with 2 hard jets at the parton le 4 Signals for benchmarkIn points this section we discuss the propertiesas of well the as benchmark po other observables which allow for hints on the unde sections with theabout production 1-2 cross sections in table 1, we se 0.03% of the bottomof pair events. Finally we obtained contrib events contained two have simulated 300 000events top using the pair same production procedure events as for and the 500 benchmark 000 points. backgrounds get strongly reducedhadronically by decaying the combined cuts on 4 ha by far dominant contributions topair the production signal together region were with foun 1 hard jet at the parton level ( gether with 1-2 hard jetstogether at with the 1-2 parton level; harddirect bottom production jets quark of at pa the parton level; the producti Various SM backgrounds have been considered: top quark pair background cross section in the signal region of ∼ JHEP04(2015)172 > -jet (for T b right ough 3 P − 10 45 fb (P5), . × 0 4 . ∼ 1 P8 1.4 0.46 -jets (with ∼ b P7 3.3 s P1–P8, as well as the 0.56 the nature of the decay ard jet multiplicities are bles differ considerably for %-90%) nor by the cuts on P6 se points are 2.0 2.1 integrated luminosity will be ents. Then, the signals of a 1 cceptances of − 100 GeV) and d thus on the strongly interacting P5 2.7 0.45 > for points P3 and P8 (all normalised . T 5 integrated luminosity; since the event 2 P P4 1 1.8 0.30 − of integrated luminosity are required for a after the cuts described in section 3 for the 1 − bb P3 1.3 0.7 – 9 – M ). Again, event numbers in the signal regions 46fb (P8), i.e. still above the background cross 2 . can be well visible above the background, even for 0 b ¯ P2 2.1 b 0.35 ∼ for points P2 and P4; extreme cases of high and low 5 P1 3.1 1.9 ] 3 − for the benchmark points P1 and P2 (left panel), and P3 and P4 ( 10 bb [fb] (for P7), the signal rates — if visible — can provide at least r × M 56fb (P7) and 3 . 0 − Point signal 10 we display the spectra of ∼ σ spectra are normalised to 100fb 4 × accept. [ 3 bb . 3 M . Spectra of . Cross sections in the signal region for the benchmark point ∼ 0 fb (P6), Additional observables, which can help to shed some light on The In figure . 2 ’s, not by the cuts on jets (reducing the event rates by only 80 -jets. These acceptances are summarised in table 40GeV) in the events whichthe have various passed benchmark the cuts. points.shown Both in Extreme observa the cases left panel of of high figure and low h cascades, are the abundances of hard jets (with information on the initial squark/gluonSUSY cross spectrum. sections, an P8) to multiplicities are shown in the right panel of figure panel). are small for P5, P7 and P8; several 100fb statistically relevant number of signal events. Given the a numbers per bin are small for P2 and P4, several 100fb Table 2 Figure 3 b points P5–P8. The cross sections in the signal region for the corresponding acceptances. τ P2 and P4 despite the large widths of the peak in this channel. required to see125 a GeV statistically Higgs boson relevant decaying number into of signal ev ∼ section in the signal region (see table JHEP04(2015)172 eft -jets -jets right b b of the hard R quark pairs. b ’s to satisfy our τ appear in the gluino d more t panel). nto two cades: large hard jet mul- sed jet algorithm.) gluinos. Including two grated luminosity and suffers . Instead of showing diagrams inos lighter than squarks, such to define the ratio te number of events per bin. (Of 100GeV) to the number of events -jets from the lowest order matrix b > T P of the number of events with 3 or more – 10 – jets − b R 100GeV) multiplicities for the benchmark points P2 and P4 (l > T for the benchmark points P5 and P6 (left panel), and P7 and P8 ( P bb M -jet multiplicities for the benchmark points P3 and P8 (righ integrated luminosity). b -jet multiplicities indicate whether top or bottom squarks 1 b . Hard jet (with . Spectra of − The The jet multiplicities provide information on the decay cas element — not all of which are tagged, but QCD radiation can ad Again it is useful to define a ratio cuts), each event for P7 and P8 contains a priori six from one Higgs boson (as the other Higgs necessarily decays i decay cascades, and are more pronounced if squarks decay via to 100 fb panel), and panel). number of events with 6 or more hard jets (with Figure 5 Figure 4 with 5 or less hardsomewhat less jets. from This statistical ratio fluctuationscourse, than is the it independent absolu still of depends the inte on the cuts applied, and even on the u tiplicities appear generally forthat benchmark squarks points decay with dominantlyof (or glu these exclusively) multiplicities via for gluinos all points, we find it convenient JHEP04(2015)172 os miss T and y be E hard 1. With R ∼ < jets − 1 except for P5 b decay cascades all R ∼ < P8 4.3 .e. squarks decaying 16.3 ∼ < signature of sparticle 5 t squark/gluino masses . of integrated luminosity; uinos (as for P7 and P8), miss T P7 6.4 6.8 1 ategies not relying on large eV range, where the small E -jets. The ratios − n NLSP with a mass slightly anching fractions into given ishable since the benchmark b ategies relying on two Higgs can be observed: t can still be optimised (con- ia top/stop have sizeable increases also with the squark upper bounds on squark/gluino 2 (actually P6 00 fb 0.79 0.63 sed observables would give strong ∼ < hard R 3 indicates longer squark cascades via P5 1.6 1.0 hard ∼ > R P4 10.6 0.37 hard final state leads to large signal-to-background R τ – 11 – 2 b P3 3.4 0.25 LSP + Higgs decay, the ), which allows to distinguish them from points P6/P8, as defined in the text for the eight benchmark points P1–P8. 2 → P2 0.70 0.09 jets − b R final states) after realistic detector simulations. This ma P1 0.54 0.09 and b 6. 5. Once gluinos can decay into stops/sbottoms, but for gluin . 0 ∼ > hard jets or 4 ∼ < R − hard jets b γ R − 2 R b b jets R − b 40GeV) to the number of events with exactly 2 R > T . The ratios are summarised for the eight benchmark points in table 3. P would also be required for the run II at 13TeV c.m. energy. with gluinos decaying into top/stop); gluinos as for P3, P4, P7 and P8. Of course, directly into a quark and the bino), have still heavier than squarks — as for P5 and P6 — we have 0 masses, as is visible when comparing P1/P2 and P3/P4. stops/sbottoms in gluino decays andwe squarks heavier have than gl have Points P1, P2, P3 and P4 without stops/sbottoms in the gluino Points P1, P2, P5 and P6, with gluinos heavier than squarks (i Despite the statistical fluctuations, the following trends These (peculiar) features appear clear and easily distingu We have proposed benchmark points corresponding to differen jets • • − miss b T R above the threshold for the NLSP hints on the underlying sparticle spectrum. 5 Summary and conclusions In the presence of a light singlino-like LSP in the NMSSM and a points correspond to simplifiedchannels. models with Still, (mostly) together with 100% the br signal rates, the discus in which gluinos decay via bottom/sbottom pairs. production is considerably reduced.masses In from these the scenarios run the IE at the LHC are alleviated, and search str (with from leptonic top decays (see figure Table 3 Finally, we recall that points P5/P7 with gluinos decaying v ratios for all massessidering, and decay e.g., cascades 2 considered here, bu required for squark/gluino massessignal cross at sections or after beyond our cuts the would 1.4/1.5T require several 1 bosons in the final state. The proposed 2 and decay cascades, and studied the prospects for search str JHEP04(2015)172 ]. , l licities SPIRE ommons IN [ (2014) 319 e . 64 (2014) 055 (2011) 012 06 ]. 11 d also influence searches ng Network HiggsTools tial Training Network IN- JHEP TeV –proton collision SPIRE rt from the ERC advanced , arXiv:1309.0528 JHEP ]. IN , redited. ]. tegies for these cases for the ]. , = 8 ][ s lead to more boosted Higgs, et substructure techniques. s s for direct neutralino/ √ SPIRE , ]. SPIRE = 8 TeV SPIRE IN s IN IN persymmetryPublicResults ][ √ ][ ][ Study of LHC Searches for a and Ann. Rev. Nucl. Part. Sci. SPIRE , IN ][ Status and Implications of arXiv:1302.6587 [ =8 TeV proton-proton collisions using the ATLAS – 12 – s Stealth Supersymmetry Lessons for SUSY from the LHC after the first run √ arXiv:1308.1841 would be reduced as well, and two Higgs bosons would arXiv:1107.5055 [ [ arXiv:1404.7191 [ (2013) 351 miss ), which permits any use, distribution and reproduction in T ]. ]. ]. arXiv:1405.7875 E 63 [ Search for new phenomena in final states with large jet multip Search for squarks and gluinos with the ATLAS detector in fina (2013) 130 SPIRE SPIRE SPIRE (2012) 081 IN IN IN Search for new physics in the multijet and missing transvers (2014) 2801 10 11 ][ ][ ][ CC-BY 4.0 (2014) 176 This article is distributed under the terms of the Creative C C 74 09 JHEP JHEP , Naturalness and the Status of Supersymmetry , The State of Supersymmetry after Run I of the LHC collaboration, collaboration, collaboration, JHEP , arXiv:1105.5135 arXiv:1411.1427 arXiv:1402.4770 momentum final state in proton-proton collisions at ATLAS experiment data and missing transverse momentum at [ Many Jets Beyond-the-Standard-Model Searches at the LHC [ ATLAS Ann. Rev. Nucl. Part. Sci. Eur. Phys. J. https://twiki.cern.ch/twiki/bin/view/AtlasPublic/Su CMS [ states with jets and missing transverse momentum using The scenario with a light singlino-like LSP in the NMSSM woul [1] [9] J. Fan, M. Reece and J.T. Ruderman, [7] E. Halkiadakis, G. Redlinger and D. Shih, [8] [4] J.L. Feng, [5] N. Craig, [6] I. Melzer-Pellmann and P. Pralavorio, [2] [3] [10] M. Lisanti, P. Schuster, M. Strassler and N. Toro, any medium, provided the original author(s) and source are c References the signal significance could be further increased by using j in this regime, in which the heavier supersymmetric cascade for direct stop/sbottom pair production,production. as In well all as these searche cases, grant Higgs@LHC, and(PITN-GA-2012-316704). from the European Union InitialOpen Traini Access. run II at the LHC remain to be devised. Acknowledgments U. E. and A. M. T.VISIBLES acknowledge support (PITN-GA-2011-289442). from U. European Union E. 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