PoS(PP@LHC2016)006 http://pos.sissa.it/ , ‡ camilla.galloni@cern.ch , and Luigi Longo † ∗ , Camilla Galloni [email protected] Università degli Studi di Genova andUniversitaet INFN, Zuerich, Genova, Zuerich, Italy Switzerland Università del Salento and INFN, Lecce, Italy The Standard Model of particleof physics the is a 125 sensational GeV success,dard Higgs Model especially boson. doesn’t since address, the like the discovery However, natureasymmetry, there of the are dark neutrino matter still and oscillations, dark several theblem. energy, open the inclusion Theories matter-antimatter questions Beyond of the that general Standard Model the relativityite (BSM), and Stan- such Higgs, as Extra-Dimensions, the Supersymmetry, Extended Little hierarchy Gauge and pro- models, Compos- els, Technicolor, and Left-Right many symmetric other mod- BSM scenarios arepresent trying the to most answer recent these results questions. for In searcheslider these Beyond (LHC) the proceedings by Standard we Model the at ATLAS the andand Large CMS Hadron exotics. experiments, Col- The focusing data on are signaturesof found with a to top, signal be bottom, allows consistent tau to with set thebranching limits Standard ratio at Model. and the on 95% The the confidence non-observation massesmodels. level on of the the production hypothesized cross new section particles times for appropriate benchmark ∗ † ‡ Copyright owned by the author(s) under the terms of the Creative Commons c Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0). PP @ LHC 2016 - VII16-18 Workshop May italiano 2016 sulla fisica ppPisa, a Italy LHC On behalf of the ATLAS andE-mail: CMS Collaborations Andrea Favareto [email protected] Search for signatures with top, bottom,exotics tau and PoS(PP@LHC2016)006 1 at ˜ b 1 ( − 2 ˜ t , is con- S and 2 1 ˜ )+ t L , are searched − B ( miss 3 T ) so far. E 1 1 − − = ( R ] provides solutions to some of the ); in a large variety of models, the 3 4 , at centre of mass energy of 13 TeV. 3 , 2 2 , at centre of mass energy of 7 TeV and 20 fb 1 1 = 0 i − ˜ χ parity, defined as − R 1 ), can mix to form two mass eigenstates, L ˜ b and ) and neutralinos ( and events with large missing momentum, 2 R , 1 ˜ 0 b 1 ( ˜ = ± χ i is assumed to be the lightest supersymmetric quark (squark) and as ˜ L χ ˜ t 1 ). An additional Higgs doublet is also introduced together with its ˜ t S ] experiments with high energy proton-proton collisions to test the Stan- and 2 R ˜ t ) quark, b ( ] and CMS [ t 1 at centre of mass energy of 7 and 8 TeV, and Run 2 known as charginos ( ). In many scenarios 1 2 3 Run 1 corresponds to LHC proton-proton data from years 2011 and 2012 at the centre of mass energies of 7 TeV Run 2 corresponds to LHC proton-proton data from 2015, hence after theAll machine the technical mass stop eigenstates of are 2013-2014, ordered at by increasing mass. The ATLAS and CMS experiments has run extensive physics searches to cover as many sce- Supersymmetry is one of the most studied framework to extend the Standard Model since it The SUSY partners of the Higgs and electroweak gauge bosons mix to form the mass eigen- The Standard Model of particle physics has been very successful at describing particles and ˜ b 1 2 3 and LSP is the lightestas neutralino proof of the supersymmetry.(bottom), Even the scalar partners of the right-handed and left-handed top and 8 TeV. The collision datasets correspond to approximately 5 fb 8 TeV. the centre of mass energy of 13 TeV. The collision datasets correspond to approximately 3 fb narios as possible. Thesesupersymmetry proceedings and review a exotic selection signatures of basedRun on results 1 the among LHC the proton-proton many searches collision for data collected in provides a natural solutionpersymmetric to Standard the Model hierarchy (MSSM), problem.fermionic it (bosonic) In predicts Standard its a Model minimal new particleence bosonic formulation, with of identical (fermionic) Minimal half quantum partner Su- unit number for of except each spin for a ( differ- states open questions. In addition tothe SUSY, term there of are exotic many physics othermodels, (e.g. theoretical Technicolor, approaches Little Left-Right and grouped symmetric Composite under models,issues Higgs, mentioned etc.) Extra-Dimensions, above, Extended and that Gauge predict address a rich as phenomenology well accessible some at the of LHC. the open 1. Supersymmetry supersymmetric partner. In orderassumed to that preserve the the multiplicative baryon quantum number numberserved. (B) In and this lepton framework number(L),particle SUSY it (LSP) particles is is are stable produced and in a candidate pairs for and dark the matter. lightest supersymmetric dard Model and perform searchesextensions for of the physics Standard Beyond Model, the Supersymmetry Standard (SUSY) Model. [ Among the possible their interactions. There are howeverdress. several The open unexplained questions phenomena that and thethe problems Standard matter-antimatter like Model asymmetry, the the doesn’t nature ad- neutrinothe of oscillations, hierarchy dark the problem, matter suggest inclusion and that of the darkyond general universe energy, the we relativity observe and Standard requires Model theoretical developments (BSM).ATLAS Be- [ The Large Hadron Collider (LHC) at CERN has provided the Search for signatures with top, bottom, tau and exotics Introduction PoS(PP@LHC2016)006 ] 0 1 ˜ χ 10 miss T ) as ¯ b [ 1 (1.2) (1.1) b E ˜ b ± 1 ˜ χ → ] ] ] ] ] ] ] ] b 6 6 7 9 4 g invariance jet respec- , 10 10 12 respectively ) → 8 th 2 j 1 1 ( and ˜ ˜ t − 0 1 SU ˜ χ } ¯ t )] t t ATLAS [ ] & CMS [ ] & CMS [ r 5 5 ] & CMS [ ,~ → , and the contransverse 2 , ] & CMS [ ) and the 2 4 7 11 g T is neglected; in this way and 2.3 fb lept t m 4 1 P ~ lept ( − 2 ) and bottom squarks ( ] and can be considered an es- T 1 2 ˜ t ATLAS [ m T jet , T p ) ATLAS [ ATLAS [ ATLAS [ P ~ t q lepton ( soft term − ,~ ) ) ) ) ) 1 1 th ˜ ˜ q q i ± ± ± 0 0 0 ] that looks at ˜ jet ( ( T ˜ ˜ ˜ lept χ χ χ 6 miss T t P ~ m m ( ( ( [ P ~ E ( 5 GeV ATLAS [ m m m − T 10 GeV ATLAS [ ) in the final state, the studied signal models ), top squaks ( 100 GeV ATLAS [ is the scalar sum of the transverse momenta 2 × > > << << m ] ) = b [ g 2 )+ 2 ) ) ) ) 0 1 T ˜ ˜ 1 1 )+ g g ˜ ± ˜ 1 jet t χ T ˜ 0 H ( ( b 1 2 ˜ ( , χ ( ˜ E max χ 1 ) = ( m m ˜ m t ( { m ( ± 1 m + m ˜ χ 1 m miss t ( P ~ ∆ jet T ) = m = ; while ) = t 1 E r ˜ min t ~ [ ± 1 ( + ˜ t χ miss T q q m ~ ( H m ) = ) = 2 2 and ) and bottom quarks ( jet t T , lept 1 , H 0 0 . Other useful variables used for other searches, like the 1 1 0 1 1 ˜ ˜ ˜ χ χ χ jet ( miss soft term T are the transverse momentum of the lept 0 1 tW bW bW H i ( ˜ CT χ 2 ¯ jet t m T T → → → is the magnitude of the vector sum of the jet P 0 1 0 m 1 ] ATLAS analyses, were the leptonic stransverse mass, ± ± ± 1 0 1 1 1 . → ˜ 0 ˜ 1 χ χ ˜ ˜ ˜ ˜ χ 1 ¯ χ χ ˜ χ t ¯ χ b 11 miss b t ¯ T t 1 b b t [ ˜ b and t t soft term takes into account the calorimeter deposit not associated with any objects. H 0 i 1 → → , defined as ˜ → → → χ → → → SUSY models analyzed by ATLAS and CMS with a final state characterized by a top quark or 1 1 miss T 1 1 1 b Signal Model SUSY masses spectrum Experiment lept ˜ ˜ ˜ T ˜ ˜ CT ˜ ˜ ˜ b g g b g t t t E P m → the Thanks to the increased Run 2 LHC centre of mass energy (13 TeV), the sensitivity to a To better discriminate the supersymmetric processes from the Standard Model ones, in addi- 1 4 ˜ b decay processes, due to theto all exhibit hadronic-final large state values request,of of the the target jets, SUSY events are expected a better separation between signalshould and contribute background to should be obtained since only the neutralinos timate of the missing transverse momentum when the where shown in Tab. possible discovery is higher than theexperiments one reached were in able Run 1. to For exploredata this collected the reason, in both possibility 2015, ATLAS of and consisting CMS a in supersymmetry an integrate discovery luminosity already of with 3.2 the fb leading to a potentially large production cross-sections at the Large Hadron Collider (LHC). for the two experiments. Insignatures particular, focusing with the top attention quarks on ( SUSYessentially processes involve characterized the by pair production of gluinos ( ˜ were used. For example in the CMS multi-jets analysis [ or mass, tion to the missing transverse momentum, other kinematic variables based on or correlated to Table 1: bottom quark signature. Forwhich each experiment has of developed them analys(es). it A has 100% Branching been Ratio specified (BR) the is assumed SUSY for masses all spectrum thea decays. assumed consequence and bottom squark may also be light, being bound to top squaks by Search for signatures with top, bottom, tau and exotics PoS(PP@LHC2016)006 7 is ± is 1 ˜ χ α T ; in 0 1 1 b E ˜ ˜ χ b m → / 1 ) ˜ and t 1 where ) and then 0 ˜ χ 2 ) 1 jet . On the right ˜ b m 0 1 − ˜ miss χ T b − ¯ P ~ b N · 1 b ˜ 2 b α T m P ~ variables leading to → ( − g CT m miss T and ˜ E 0 1 excess has been observed α T ˜ χ E ¯ t is bounded from above by the ( σ t 2 no significant excess has been 2 T + → 1 . In contrast with this choice, in χ 2 m g 1 m instead has a bound at 135 GeV for + 2 α CT are the mass and transverse momentum of some m m α T p ~ decays, ) = could be considered to be a variable formed χ and 2 m ]. T , α WW 6 α m m 3 , 0.72. m . , χ 2 6 ± analysis, where a 2.3 and m ¯ t 0 1 miss t T plane [ + ˜ P χ ~ 2 , t | α T miss T ), asking for a different number of b-jet ( P ) in all possible combinations that satisfy the kinematics of ~ ; for → miss t ( T plane as shown in Fig. H r jet 2 T P ~ ~ 1 | , ˜ t − m t miss N t q q T ~ P ~ miss T H H processes are not limited. and − t is the mass of the invisible particle, which is usually assumed to be zero. 1 ˜ t T r χ ,~ H t m is defined as q ~ is defined as T m miss T into two parts ( E , indicates the transverse mass 2 α miss m t T P ~ + m 2 | α T P ~ In the left plot the observed numbers of events and the corresponding Standard Model background | while q 5 For data interpretation the two experiments use a different approach. CMS prefers to define Leptons and jets are sorted withThe respect transverse to mass their transverse momenta, from the most energetic to the lowest one. With exception of the ATLAS 12 events were observed, against the expected 5.50 5 6 7 events whereas for production of bottom squark pairs the limit is given by ¯ t defining 6 regions in the several orthogonal Signal Regions and to combinethis them is in case the no case excess is ofdifferent observed. the ranges For CMS of instance multi-jets jet analysis multiplicity where ( 72 signal regions were defined considering this way for a signalupper-bound model is with pushed a up bottom to squark 800 mass GeV. of 800 GeV and a neutralino massless the the definition of the 6 regions in the equal to mass of the W boson while in one of the signal regions, for all the analysis shown in Tab. the event and calculating the transverselower mass limit for on each the decay mass branch; offinal the a state resulting pair-produced with value SUSY the is particle given the that best could have decayed to the observed predictions in the 72 signal regions defined by CMS for the search of ˜ the ATLAS analyses it is possiblethe to one have with the the definition best of sensitivity different is non-orthogonal considered SRs and for only the final results. For example for the Figure 1: from dividing analysis to look to bottom squark models, where a large mass difference between observed and, as a consequence, limits on the SUSY particles masses have been set at 95% CL. In Search for signatures with top, bottom, tau and exotics tively present, three signal regions wherea defined not just statistically increasing independent the definition cut ofavoid on the bias the SRs; in the a analysis. choice between them is therefore obliged to visible particle. The parameter t PoS(PP@LHC2016)006 , 3 → / 5 g X signal model 0 1 ˜ χ ¯ t t → processes are shown g 0 1 ˜ χ b → 1 ˜ b and ) or exotic charges 5/3 or -4/3 ( ± 1 ˜ B χ , b T ]. In the bottom part the ATLAS limits for 10 GeV, are reported together with the CMS 5 → )+ ] . They are defined as colour-triplet spin-1/2 1 ˜ t ± 1 , ˜ 16 χ 0 1 ( ˜ χ 4 m ¯ b ]. These particles can be SU(2) singlets or doublets b 17 ) = 1 → ˜ t ( g m ] is shown together with the exclusion plot relatives to the ˜ , ˜ 0 1 14 ˜ χ ¯ t t → g ]. 14 ] and Composite Higgs [ 15 decay [ 0 1 ˜ χ b → ], under the assumption that 1 ˜ b 10 In the top part of the figure the summary of exclusion limits relative to ˜ [ ± 1 ˜ the exclusion limits for ˜ χ process obtained by the ATLAS experiment (right) [ ). Vector-like quarks are expected to couple preferentially to third-generation quarks and they b Vector like quarks (VLQ) are non chiral fermions predicted by a large variety of theories All the results provided by the two collaboration are valid only under the assumption of sim- 2 3 0 1 / ˜ 4 χ → ¯ b − 1 ˜ obtained by the CMS experimentb (left) [ ones for the fermions whose left- and right-handed chiralunder components the have weak-isospin the SU(2) same gauge transformation group properties [ BSM, like Little Higgs [ Figure 2: 2. Vector like quarks and resonances and have the same charge as the top or bottom quarks ( can have both charged and flavor-changing neutral current decays. plified models with a branchingpresent in ratio the equal theory, to worse exclusion 100%.are limits expected can in In be the fact, obtained SR if because due of to additional the the decays lower fact branching processes that ratio. are less signal events Search for signatures with top, bottom, tau and exotics Fig. together with the Run 1 results when available. t Y PoS(PP@LHC2016)006 ] ], 30 19 -tagged b . ATLAS quark under Ht , T ], colorons [ Zt , , both experiments 18 Ht Wb , or Higgs bosons decays → Zt Z , , T quark mass range between W Wb T → system is reconstructed and inves- T coupling in production. A search [ T -tagged, using as main discriminating Zt W ), with and T Wb 5 -jets, the high scalar sum of transverse momenta of b ]. ] selects events in the lepton plus jets final state with 27 29 , -like bosons in extended gauge theories [ 26 , W 25 , 24 , -like or Z in the lepton plus jets final state, characterised by an isolated electron 23 , -pair production with significant branching ratio to a Higgs boson and a X T 22 + Ht → ] and models with extra dimensions, such as Kaluza-Klein (KK) excitations of glu- ] for VLQ 20 TT ]. These models predict resonances in the TeV mass range. Resonant Standard Model 28 21 quark into a Higgs boson and a top quark is searched for, events are selected requiring at quarks can be also singly produced assuming For pair produced vector like quark of charge 2/3 ( T The decay products of such high masses resonances can be boosted, i.e. have large momentum Final states with heavy flavor quarks and third generation leptons are interesting also for other T was performed by the CMS collaborationlike in lepton plus jet finalleast state. a Since Higgs-tagged the jet decay and the of invariant a mass vector- spectrum of the in boosted topologies [ have update the Run 1 results witha the search data [ collected in 2015. The ALTAS collaboration performed 2.1 Vector like quarks large number of jets and at least a large cone jet, which is top quark, axigluons [ ons, electroweak gauge bosonsmodel or [ gravitons in various extensions of the Randall-Sundrum (RS) variable the minimal invariantjets. mass between For both all experiments, the nois combinations significant observed, of excess and of the 95% events lepton above CLseveral the and branching lower Standard a limits ratio Model are hypotheses expectation assuming derivedand on contributions CMS the only observe mass from 95% of700 confidence the GeV level vector-like and (CL) 900 lower GeValready limits for improving all on the possible Run the values 1 of limits the of about branching 50-100 ratios GeV into the three decay modes, object production could be visiblesystem. in In the this reconstructed TeV range, invariant bothRun mass ATLAS 2 spectrum and centre CMS of of experiments, mass the thanks energy, finalin have to state 2015 the the same as increase sensitivity in the to the one newand LHC processes collected performed with in again the with Run dataset the 1. collected 2015 data. Thus, many analysis performedcompared in to Run their masses, 1 so were that optimized hadronic their quarks final and decay bosons products decays can that be adecay very single products. collimated. hadronic This jet Techniques means with that for a exploit largeto the radius reject encompasses presence all background of its from substructure standard withinwithin QCD this the jets jet same and bunch are reduce crossing employed the (pile-up).employ dependence Despite similar on differences tools in multiple to the identify interactions algorithms, (tag) ATLAS jets and compatible CMS with top-quark, numerous extensions to the Standardplings to Model, third that generation predict quarks and gaugein leptons. the interactions production Massive with new of enhanced particles Standard could cou- Modelwith manifest particles massive as color-singlet pairs. resonances Examples of such resonances include models or muon with high transverseThe momentum, search large exploits missing the transverse high momentum multiplicity and of multiple jets. Search for signatures with top, bottom, tau and exotics all final state objects, and theas presence of large-radius boosted, hadronically-decaying jets. resonances reconstructed The CMS search [ PoS(PP@LHC2016)006 , ]. ν ` tb ) is 31 tb → → ( 0 0 W W W decay. These 0 ] for 34 bqq → bW s) decaying to top-antitop 0 Z → t -tagged events, being events with b function that keeps into account the top boson reconstruction differs between the 0 quark are set to be 960 GeV and 940 GeV, 2 Z production is found and upper limits on the χ X ¯ boson decaying to top and bottom quarks and t t 0 W can be excluded in the mass range from 300 GeV 6 0 boson like resonances ( Z W bosons with purely right handed couplings, the observed ), jets, and missing transverse energy is analyzed. Events 0 µ , W e , a signal would appear as an excess of events with high trans- τν is found and 95% CL upper limits on its production cross-section 0 → 0 ]. Both selections are optimized for heavy resonance masses, where W W 33 , 32 ] for 35 quark to Standard Model particles, respectively. T Both ATLAS and CMS search for heavy Other heavy top quark partners of charge 5/3 are looked for with data collected by CMS [ Resonances compatible with a heavy gauge In the search [ -tagged jets enriched in backgrounds. A bump in the invariant mass spectrum of the leptons have been performed by CMS with the 2015 dataset. In the search [ b verse mass, where the Standard Model background istau low. and Events missing are energy selected compatible requiring with an hadronic thejets neutrino faking presence. tau To leptons, suppress isolation background fromdates. requirements QCD are At applied high in masses conesmasses around the below the limits 1 hadronic TeV obtained the tau from Run candi- 1 thethe limits two 2015 still analyses, data profits sequential from are Standard the already larger Model statistics more of stringent, 2012 data. but for Combining quark pairs in thedecays 2015 leptonically data, looking [ for one top quark decaying hadronically while the other to 3.3 TeV at 95% CL. 2.2 Resonances respectively. The search exploits events withleptonic two final different state. signatures: No significant same-signlimits excess dileptons on is the as observed mass well in of as the a data a right and semi- handed observed and 95% left CL handed exclusion the top quarks have largedecay Lorentz-boosts. and two This or more results quarks in reconstructed non-isolated in leptons a single from jet the from the Search for signatures with top, bottom, tau and exotics tigated for “bumps” compatible withbackgrounds new is resonances. observed. No For significant a mass excesstions of over above 1000 Standard 0.9 GeV, Model pb production and cross 0.6 sections pb timescoupling are branching of excluded frac- the at 95% confidence level, assuming left and right handed jets are identified using top-tagging algorithms. The a final state signature with a lepton ( two experiments: CMS assignsjets the to the lepton hadronically and decaying the one jet minimizing to a the leptonically decaying top and the are further divided in categories depending on the number of mass resolution, evaluated in simulations; ATLAS insteadclosest chooses jet to to assign the to the lepton. leptonic No top the evidence for resonant production cross section of heavy resonancesnarrow width for scenarios, various limits width are and set physics4 between models TeV (CMS) 100 are or pb set. 5 and TeV(ATLAS), showing In 70 how the the fb two for experiments masses reach between very similar 500 sensitivities. GeV and no searched. No evidence of a times branching fraction are set.95% For CL lower limit is 2.4 TeV, being currently the most stringent limits in this channel. τν PoS(PP@LHC2016)006 -hadrons R -hadrons may be singly R 13 TeV corresponding to an ]. The Pixel subsystem of the -parity. The lifetime of these = R 37 s -hadrons the lower mass limit at ) as the LLP, and of colored meta- R √ ˜ -hadron. τ R -hadrons [ slepton ( R τ 7 13 TeV corresponding to an integrated luminosity of = s √ ]. Candidates are asked to have signatures of anomalously 38 [ ] predict the existence of meta-stable sleptons, in particular in ) in split SUSY. Squarks and gluinos can hadronize with either 1 g 36 − -parity-violating coupling. Because of their large mass, LLPs are expected R ) and gluinos ( ˜ q significantly below 1) and, if charged, to have a specific ionization higher than any β , an Inner Detector (ID)-only search, potentially sensitive to meta-stable gluino 1 plus a 100 GeV neutralino are excluded at the 95% confidence level, with lower mass limit − 1), thereby having a measurable time-of-flight, and to release an anomalous amount of energy According to these signatures, ATLAS and CMS performed several searches. ATLAS recently Massive, long-lived particles (LLPs) are predicted by a wide range of physics models that Long-lived particles, with lifetimes from around 1 ns to several tens of ns, can either travel As mentioned before, heavy LLPs are predicted by several extensions of the Standard Model. ¯ q < q β ranging between 740 GeV and 1590 GeV. In the case of stable not reaching farther sub-detectors, orATLAS to detector stable is gluino used toand measure to the search ionization energy for lossbackground such expectations of highly is reconstructed ionizing observed. charged particles. Gluino particles to R-hadrons with No lifetimes significant above deviation 0.4 ns from and Standard decaying Model the 95% confidence level isdetector 1570 searches, GeV. mainly ATLAS and intendedfor CMS for heavy experiments stable stable are R-hadrons. charged also particles performing produced In full- in particular pp CMS collisions published at high a energy search deposition in thedata silicon are tracker consistent and with longof the time-of-flight expected long-lived to background gluinos, the and stops muon1590 limits and detectors. GeV on staus for the gluinos, The are are cross set. the section most for stringent Corresponding to production date. lower mass limits, ranging up to 3.2 fb published, with the 2015 LHC data at Gauge-Mediated SUSY Breaking (GMSB) with the stable squarks ( ˜ a light Standard Model quarkcharged, doubly system charged or or a neutral, gluon, theying can forming processes either with a change the their detector electric material,LLPs charge or by should decay nuclear be in scatter- the produced detector( at given their the finite LHC lifetime. as Heavy while massive passing through particles. the detector. They They may are also expected interact like to heavy move muons. slowly integrated luminosity of 2.4 fb extend the Standard Model.including supersymmetric LLPs models arise that in either proposed violate solutions or to conserve the gauge hierarchy problem, distances comparable to the size ofcan the decay ATLAS and far CMS from detectors the andby primary thus both appear interaction experiments to point. exploiting be different stable, Wide-ranging techniques, or searcheserage. with some for nontrivial LLPs overlaps are in performed lifetime cov- 3.1 Stable and meta-stable Massive particles Some Supersymmetry models [ Search for signatures with top, bottom, tau and exotics 3. Long-Lived Particles searches particles depends on the mass difference betweenand the on particle the and size the of lightest any stable SUSY particle, Standard Model particles of unit charge at high momenta. to be slow ( PoS(PP@LHC2016)006 v π particles. The v π -quarks then hadronize decays in the Inner De- v v π , a hidden sector scalar boson which hs Φ 8 8 TeV. The first analysis is sensitive to long-lived mixes with = 8 TeV collected at the LHC, have been performed by Φ s = √ s -quarks hadronize into showers of . √ v T p -quarks, in analogy with QCD. The that instead decays deep inside the calorimeter is reconstructed v , produced by quark-antiquark annihilation decays into the hid- 0 v -parity-conserving SUSY models that do not have large missing ). The hidden sector consists of a confining gauge group that Z . The v π R v q ¯ q v q ]. No significant excess above the background expectation is observed → 40 is unconstrained and could be quite long. If a 0 v Z -quarks ( π v are pair-produced and each decays to a pair of Standard Model fermions. The v of 2012 data collected at π 1 -hadrons out of its v − ] and CMS [ -particles that can decay back to Standard Model particles. The lightest hidden sector of proton-proton collisions at 39 v 1 − a Standard Model sector scalar boson makes can decay to lifetime of the to particles tector (ID) or indisplaced the vertex Muon (DV). A Spectrometer (MS),as it a jet can with be an unusual reconstructeddata energy quality. as signature that a most non-standard traditional searches reject asa having massive poor communicator, lifetime is a free parameter. Stealth SUSY: a class of transverse momentum signatures. Thisplaced scenario gluon jets results per in gluino decay one resulting prompt in gluon two DVs. and two dis- den sector via Many extensions to the Standard Model include the production of particles that are neutral, In Anomaly-Mediated Supersymmetry Breaking (AMSB) models, the lightest chargino is Two searches for direct chargino production based on a disappearing-track signature, using • • • weakly-coupled and long-lived that canparticular, decay three models to are final-states studied containing with the several ATLAS hadronic experiment: jets. In for candidate tracks with largeobtained. transverse In momentum, the and AMSB scenarios, constraintsmass ATLAS on and below chargino CMS 270 excluded properties GeV at and are 95% 260 GeV confidence respectively. level a chargino 3.3 Displaced vertex ATLAS [ nearly mass degenerate withis the that the lightest chargino neutralino. haslow-momentum a charged considerable One pion. lifetime prominent The and feature low-momentum predominantlyto charged decays of pion its into track these large a is scenarios neutralino displacement rarely plus and reconstructeddecaying a due chargino a is small typically number recognized of asthe a interactions outer “disappearing tracking in track” volume. the that Ad-hoc has trackingfinding reconstruction few system, the algorithms associated therefore, disappearing-track hits for in short a signature tracks suffersmaterial, are from charged needed, charged leptons because hadrons losing interacting muchbremsstrahlung, in and of short-length the their tracks detector originating momenta from dueresulting a in to combination anomalously of scattering high wrong with space-points values and material or large 20.3 fb Search for signatures with top, bottom, tau and exotics 3.2 Disappearing tracks ATLAS performed two searches forusing the 20.3 decay fb of neutral, weakly interacting, long-lived particles PoS(PP@LHC2016)006 . d γ τ c decays ]. Three d γ 45 ] or decaying 8 TeV collected 43 = decays, collimated s d respectively of 2012 γ √ 1 − ) is used. The second search EM ]. Events that contain jets with E / 41 decaying to muons, with and 18.6 fb d ]. Secondary vertices in the ID are 1 γ HCal − 42 E decaying to an electron/pion pair. The range of decays to muons. The last topology select all 9 d d γ γ of proton-proton collisions at 1 − decaying into an electron/pion pair, and from the last ID pixel layer d γ 8 TeV. = s √ ]. The data sample used correspond to 20.5 fb decaying to a muon pair and one d 44 ) mixes kinetically with the Standard Model photon. If the hidden photon is the lightest γ d γ A similar analysis has been performed by CMS that published a search for pair production of Several possible extensions of the Standard Model predict the existence of a hidden sector Similar analyses, based on the presence of displaced vertices, has been published also by CMS, No significant excess of events over the expected background are found, and limits as a func- A search for LJs in a sample of 20.3 fb decaying to electron/pion pairs innetic the fraction Hadronic is Calorimeter. needed to The reduce requirementare the of consistent Standard low with Model electromag- background multi-jet expectations, background. upper Since limits observed are events derived as a function of the LLP decay distances targeted by this topologyHadronic extends Calorimeter, from for the last IDup pixel to layer the up first to trigger the plane end of of the the MS, for the during 2012, has been performed by the ATLAS experiment and described inbeyond detail the in Pixel [ Detector upwith to one the first trigger plane of the MS. The second topology select LJs that is weakly coupled tocoupling the to visible one. the Standard Dependingdecay on Model, the back some structure to unstable of Standard hidden the Modelthe hidden states particles hidden sector with may sector and and sizeable be its the branching produced Standardphoton, fractions. Model at couple In colliders via the and the scenario vector portal, where a light hidden photon (dark 3.4 Lepton-Jets state in the hidden sector, it decays back to Standard Model particles. From searching for long-lived particles decaying to final states that include di-leptons [ tion of proper lifetime arelong-lived particles reported and for for Z’ the and decay Stealth of SUSY benchmark the models. Higgs boson and other scalar bosons to required to have high tracknot come multiplicity from and interactions high inside the mass.isolated detector with material. respect In The to addition MS the the ID track ones segments secondary are and vertices to required must have to high be number of hits. data collected at topologies are defined. The first topology select LJs with all Search for signatures with top, bottom, tau and exotics particles that decay toelectromagnetic Standard calorimeter Model or particles inside producing thelarge jets hadronic energy calorimeter at deposit in [ the the outer hadronic calorimeterIn edge and addition of isolated with a the respect dedicated ATLAS tocalorimeter ID-tracks trigger and are the based selected. one in on the large electromagneticemploys calorimeter ratio “non-standard” ( techniques between for reconstructing the decay energy verticesing of deposit to long-lived particles in jets decay- the in hadronic the inner detector and muon spectrometer [ to di-jets [ jet-like structures containing pairs ofLJs), and electrons which and/or are muons produced far and/or from charged the pions primary (Lepton-Jets, vertex of the event, may arise. PoS(PP@LHC2016)006 , = s √ lepton τ , JINST 3 (2008) , ATLAS-CONF-2016-007. of proton-proton collisions at TeV in final states with jets and two , JINST 3 (2008) S08004. 1 , arXiv:1602.09058. TeV pp collisions with the ATLAS detector − 13 = , ATLAS-CONF-2016-009. 13 s = √ s √ 10 of ATLAS data , ATLAS-CONF-2015-066. 1 , arXiv:hep-ph/9709356 [hep-ph]. − TeV pp collisions of ATLAS data in a sample of 19.7 fb 13 TeV 8 = 13 , arXiv:1602.06581. s = , arXiv:1603.04053. √ s √ Search for direct top squark pair production in final states with two leptons in Search for Bottom Squark Pair Production with the ATLAS Detector in The ATLAS Experiment at the CERN Large Hadron Collider Search for supersymmetry at Search for gluino-mediated stop and sbottom pair production in events with Search for top squarks in final states with one isolated lepton, jets, and missing 13 TeV Search for new physics with the MT2 variable in all-jets final states produced in Search for direct top squark pair production in the single lepton final state at The CMS experiment at the CERN LHC Search for supersymmetry in the multijet and missing transverse momentum final = s √ A Supersymmetry Primer , CMS-PAS-SUS-16-002. 13 TeV pp collisions using 3.2 fb 13 TeV ]. The number of observed events is found to be in agreement with the expected standard = = 46 s s pp collisions at √ √ proton-proton Collisions at transverse momentum in state in pp collisions at 13 TeV S08003. same-sign leptons or three leptons with the ATLAS detector ATLAS-CONF-2015-067. b-jets and large missing transverse momentum in Many extensions of the standard model predict new scalar or vector bosons, called leptoquarks (LQ), which carry ATLAS and CMS collaborations are conducting a wide range of searches for BSM processes, 8 [8] CMS Collaboration, [9] CMS Collaboration, [7] ATLAS Collaboration, [6] CMS Collaboration, [3] S. P. 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