PoS(EPS-HEP2019)713 https://pos.sissa.it/ ∗ [email protected] Speaker. An opinionated and informal recapincluding of some highlights aspects from of the flavour physics, EPS neutrinos,frontier HEP high-density collider 2019 QCD, physics, astrophysics conference and and in some energy thoughts Ghent, about the future. ∗ 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). European Physical Society Conference on High10-17 Energy July, Physics 2019 - EPS-HEP2019 - Ghent, Belgium Jon Butterworth Highlights of EPS HEP 2019 Department of Physics & Astronomy, UniversityE-mail: College London PoS(EPS-HEP2019)713 B .A − K + K and Jon Butterworth − difference of the ] and now used in π 3 σ + π ]. The time-integrated CP ]. There are some tensions, 1 2 [ ) ππ , , a level which has not changed with KK σ ) decays to both , 0 π ¯ D K / 0 D → respectively. These results were also discussed D 1 ( − 1 0 ∗ , and in particular the ratios and angular variables, mixing from LHCb and ATLAS were also presented, − DK s µ B + → 0 µ B and 99.7 fb 1 or − − e + e level, between different measurments, worth mentioning to emphasise the importance of σ That we are now into an era of precision, high statistics neutrino physics was amply illustrated The purpose of this write-up, as with the talk, is not to be definitive but to give an editorialised For the rest of the contribution, I will stick to the physics. There was a lot of it. Impressive advances were reported in flavour physics, with Katharina Müller presenting the Müller also presented an updated combination of measurements of the unitarity triangle angle , incuding a new measurement in the by the dataset of atmospheric neutrino events collected by SuperKamiodande [ hadrons to Kaons and either the increased precision from includingis part compelling of as the evidence Run for 2by physics Marco data. beyond Nardecchia in the While his no SM summarywhich individual (BSM), of measurement these taken is and together readily other (and accommodated comparisons) as there bywatch, is pointed extensions especially a out suggestive to as pattern the more SM.Belle LHC II This luminosity data is are is clearly on included anluminosities the and and, horizon, interesting the with space as detector the to already we accelerator recording heard currently collisions. on from its Francesco commissioning Forti, track to high 3. Neutrinos global fits, with a “postage stamp” style slide shown by Gioacchino Ranucci containing 50,000 using integrated luminosities of 4.9 by Johannes Albrecht. The main focus inwhere the his consistency talk with the however SM was is on at level semi-leptonic of decays around 2.5 of at the 2 measuring this angle in severaldepending different upon ways, the since process. new Updates physics of may manifest itself differently asymmetry is measured in neutral charmed hadron ( point of view on what waswill a packed mostly and be exciting to meeting. other Asthe (mostly befits such plenary) assumption a talks these contribution, at references will the bepersonal conference, selection, included and I in I will will the not not originalworld dwell include on cup, contributions. figures, a which on satisfying Although took semi-final it placewith and is a Ghent during a stunning for the final me necessarily conference, from fromtalk even the now cricket though by on. they the I will European will always Physicalthe say be UK Society, though and especially associated that most bearing it of in was the rest a mind of privilege the Europe to turbulent at be politics present. asked between to give this 2. Flavour Physics first observation of charge-parity violation in charm decays, by LHCb [ Highlights 1. Introduction γ measured value from zero, indicating dominantlythe direct Standard CP Model violation (SM). and The roughly uncertainties in compatible the with SM prediction are greater than those in the data. combination of the new LHC Run 2 result with the Run 1 result gives a 5.3 PoS(EPS-HEP2019)713 Jon Butterworth “useful more generally in the iden- 2 and top are now an important feature of physics at the LHC. a are beginning to constrain both the neutrino mass hierarchy H ]. It seems from this that a multiplicative rather than additive , 4 ν Z , W . 13 θ ], and highly boosted 5 [ At the time, I thought I understood something about elliptical Feynman diagramsAs from predicted, the jet substructure analysis has proved itself Several examples were shown by Wolfgang Adam, Lucia Di Ciaccio and Andreas Hoecker, The new regimes probed, and the new precision achieved with QCD theory, means that, as also When we discuss the search for “new physics”, it grates on me sometimes, since as we probe tification of hadronically decaying massivemass” particles which have energy large compared to their fascinating talk by Claudeinteresting Duhr. and useful This advance on understanding the now boundaries between escapes physics me, and mathematics but there. it seems there is an combination of the corrections is a better approximation to the fully coherent result. Several new results were shown, including amass very by direct measuring technique the from mass CMSThere of of measuring are a the “fat” interesting top jet questions containing aboutwill three how place subjets these on from techniques the the will decay detectors,the change, of scales if a and are even top such what higher that quark. demands boosts these they particles are will available need at to future be treated colliders, as and partons when in the also initial and final state with (to give just a fewasymmetry examples) impressive (including results new on calculations diboson production, of2 top NNLO TeV cross spin in sections transverse correlations), and momentum) prompt and photonsfrom a ATLAS. (now dilepton+photon As out Giulia measurements Zanderighi to with made the clear, fullability for Run to the 2 full make data exploitation exclusive of set calculations, these implementingto measurements the data our kinematic in cuts the which fiducial allowand phase comparisons much space progress. of the measurement, is essential and is an areapointed out of by intense Zanderighi, effort there istions now a to need be for incorporated both together QCDthe and in high electroweak calculations. luminosity higher LHC order (HL-LHC) This correc- era. needallel An will session early by become step German more in Sborlini, this in urgent direction theof throughout form was Drell-Yan of in dilepton a fact production coherent shown QED [ in and a QCD par- higher-order calculation Highlights events split into 19 different analysisration samples, of each the with event enough characteristics. statisticsdata to principally As allow from detailed discussed T2K explo- by and Francesca(with No Di the Lodovico normal and hierarchy Sylvia marginaly(with Pasquale, favoured) a and non-zero value the marginally CP favoured). Reactortions violating experiments to phase are characterising in also making the the major physics PMNSthe contribu- of matrix mixing the angle neutrino sector, particularly with their measurements of above the electroweak symmetry breaking scalein with a ATLAS and sense CMS, new. everything wein We measure are a is measuring region of what physics arewe previously sometimes are unexplored. previously validating unseen Every our processes, time ideasregime. we and about By do always the the so standards fundamental and of find constituents most agreement fields, and this with forces is SM, in new physics. a qualitatively new 4. New “Standard Model” Physics PoS(EPS-HEP2019)713 ], 7 , new 6 really Jon Butterworth 3 ], of just how special the Higgs boson is. It can be seen 9 is feasible, or show that different mechanisms are justified and how they arise. AA ], a system thought, before LHC data, to be too small to manifest such a thing. As 8 and pp , Salerno, Adam and Hoecker showed a plethora of new results, many using the full LHC Run 2 Even if you don’t buy my claim that most of the measurements from the LHC are new physics, Jet substructure also featured as a powerful tool in heavy ion physics and the study of high- ep , dataset. ATLAS and CMS have established thecharged existence fermions, of as Higgs couplings well to as the theond third gauge generation generation bosons. — muons New and studies charm. wereenough The shown limits to on are have the still pursuit interesting factors above of sensitivity theDifferential the to SM, cross sec- but any sections are upward for getting deviations, close Higgs andcouplings production and more evolve decay precision as test is expected whether promised. withthe is Higgs (for it self example) pointlike, coupling whether transverse requires its much momentum.and more any data, Direct precision with requiring measurement observation a possible of future with hadronwith the collider, a full just degree HL-LHC, as of a model-independence measurement requires of a the lepton total collider. Higgs width as a new force, of alocal different nature symmetry, to no the quantised gauge interactionstime. charge. known so The It far. up There is is andand deeply no down-quark neutron underlying connected Yukawa masses, couplings to and determine thus theatoms the the vacuum (and stability relationship structure thus of between the of nuclei. size the space- The ofthe proton the electron electroweak Universe?). vacuum. Yukawa controls The The the top Higgs size self-coupling quarktransition, of controls Yukawa decides and the the (in (thermo)dynamics therefore part) of might the the be stability EWUniverse. of phase responsible The Higgs for Boson the really dominance is of special. matter over antimatter in the with interesting effects seen whichisions should help must characterise be the done medium.collisions with However, [ care, such compar- given the obersvation of collective effects even in proton-proton physics. Christoph Grojeancontext in of proposals the for ECFA future session colliders [ on Sunday gave a powerful reminder, in the Jan Fiete Grosse-Oetringhaus strikingly put it,smallest this system challenges in two paradigms which attools the once. for heavy-ion What proton-proton “standard is physics model” the remainheavy remains standard? ion valid? studies, Traditional And high-energy often physics can sociologicallyunderlying and QCD the and is traditional scientifically standard the same rather theory, distant, andee the must aim grow must be together. to demonstrate The that unified description for perhaps you will agree with Roberto Salerno’s statement that Higgs physics, at least, is 6. The Higgs density QCD. An array of impressive newpelitsa results and was Carlos shown Albert by Salgado Marco Lopez. Van Leeuwen,observing The Dennis differences impact Pere- between of the the subjet medium momenta on in QCD proton-proton splitting and is heavy studied ion by collisions [ Highlights showers. Present theoretical tools are likelya to reasonable require estimate. substantial development for us even to make 5. High Density QCD PoS(EPS-HEP2019)713 ] actually 10 Jon Butterworth Sn wire toward 16 T 3 4 We also learned that the so-called “neutrino floor”, the point in sensitivity at which detec- The anomalously large number of positrons seen by AMS (shown by Barbara De Lotto) re- Our newest messenger, gravitational waves, continues to surprise and excite. One surprise to And so to something on future prospects. Much of this hangs on development of accelerator Finally on the Higgs, Francesco Riva detailed how intertwined the Higgs sector is with many The progress in searching for Dark Matter was described by Igor Garcia Irastorza, Carlos tors looking directly for Darkteractions, is Matter not scattering a off hard normaldetectors, floor, directional matter “more detection start and of seeing time a modulation solar swampland” offering in neutrino possibilities the for in- sinking words below of it. mains de intriguing los – something Heros. interesting is Anisotropic goingAnd on the there, whether IceCube it map is of Darkthe Matter-related the Universe, or not. neutrino with sky the shown obviousannihilation, by potential amongst other Elisa for things. Bernardini identifying offers point a sources truly perhaps new from view Darkme of Matter was the fact that the– “chirp” via pattern of tidal a distortion neutron – star implicationsCarlos merger, for as Albert the shown Salgado equations by of Lopez. Patricia state Schmidt, The of has lower prospect high frequencies of density should the QCD, allow as Einstein impending discussed telescope, mergers by channels, to which is be with spotted mouth-watering. its earlier sensitivity and to thus observed in more 8. The Future, and Beyond the Standard Model technology, of which we heardAssman summaries in from Catarina the Biscari final inprotons session in the the ECFA of SPS session (shown the by and Olivier plenaries.in Ralph Bruning the in the AWAKE Highlights proton-driven parallel plasma sessions), included 2 wakefieldtested GeV operational experiment, electron at crab a acceleration FNAL dipole cavities magnet to for demonstrator 14 so Tesla far with an end goal of 15 T, and work on Nb excludes some ultra-light Dark Matter models, inI which such think black a holes do reflection not form. of(at This a best) is resurgence partly delayed. in This model isIrastorza. building also and reflected exploration, in now the the increased WIMP interest miracle in is axion searches as described by from companies engaged in the Futuredevelopments will Circular be Collider critical project. for The the long-term success future (and of speed) the of field. such of the processes measuredmeasure at such things, the we LHC are,the – within parameters dibosons, the of context the top of Higgs and sector theyou – SM, agreed more. or that making doing Higgs powerful Higgs physics This consistency physics ismany tests without implies new of a of physics, the that Higgs, you other as when measurements now he ATLAS have and we styleshas to CMS it. yet accept are shown my So, producing, itself. earlier even if if claim no that trace so of are BSM physics 7. Dark Matter, Astroparticle Physics and Cosmology de los Heros and Kfirthe Blum. famous picture Amongst of the the items black which hole were at the fresh centre news of to the me giant was elliptical the galaxy fact M87 that [ Highlights PoS(EPS-HEP2019)713 Jon Butterworth ], where the GAMBIT 11 5 scattering, and we see an event with two isolated WW I will take the opportunity to highlightThe a few potential other of techniques and machine ideas learning, of long growing importance. extant around the periphery of the field, is now being And finally, the field of particle physics really must get to grips with Open Data. The culture When it comes to interpretation of searches too, we need to on the one hand provide the data in Nearer in time, we have LHC Run 3 and the HL-LHC era approaching. Isabell Melzer- In my opinion, while there is still important scope for novel signatures not yet covered (for A clearer idea of exactly what is being measured, in terms of separating theoretical interpre- realised in many different particleoffer if and used astroparticle judiciously. physics applications,but Jet will substructure and in has has already my much been view moreof continue mentioned future to and to colliders. hardly grow The counts in sameincorporating as importance, goes both new, for including QCD the and in electroweak theoretical the higher-order advances corrections. evaluation needed of to the calculate potential such variables in astrophysics should beobservations an is example; already the public fact isbehind that collaboration immensely LIGO firewalls. impressive, data Of when from course, thewithout the the effort, Higgs technical first and issues discovery gravitational brings are data challenges. wave different. are But Release still in of data the is final not analysis, data produced by our experiments system is used to show thatthere rumours still of allowed the parameter death points ofthough for the swathes MSSM any of may and the be all exaggerated. multidimensionalthere values are Not parameter of even only space neutralino some are regions and are of chargino indeed SUSY mass parameter ruled space (even out which are by marginally LHC favoured over data) the but SM. such a way that a searchsignatures, for and one model on may the be other readilytoward hand reinterpreted making in we more terms should of general be others statements movingthe with about away latter similar from approach whole was simplified classes given benchmark of by models Peter theory. Athron An in his excellent parallel example session of talk [ leptons and missing energy inCarlo the says detector, it should came from we top reallystate, quarks? and be What do subtracting about any it off-shell subtraction tops? because latertheory as It our to part is Monte calculate of often the the better interpretation. final to states This measure that throws a down are final a actually challenge measured, to of the course, as discussed above. Pellmann and Marie-Helene Genest showed thefor results BSM of physics, many none ingenious and ofThis important which is searches itself have is revealed great anythingscribed progress other by and than Giuliano is increasingly Panico having and stringent a alluded limits. few profound to years, impact several I on times believe already the we in theoretical need, this field, and contribution. will as Over see, was the a de- next profound changeexample, of exotic approach here. long-lived particles,things disappearing still tracks, to non-standard be jets,precise, dreamt model-independent and up) measurements probably the which other can main beexclusive emphasis confronted SM with of predictions. increasingly the precise experiments It and establishing whether should is or shift such not we toward confrontation face making aas in desert BSM my above physics the is view electroweak concerned. symmetry-breaking that Such scale,to measurements, gives as provide including far us the those of main the the legacy best Higgs, of seem the chance likely LHC, of to an me exacting challenge laidtation down from to measurement, future is model needed. builders. Thisthe implies detector not acceptance, only but measuring also inAn in fiducial what example: regions is reflecting if considered we background are and aiming what to is measure considered signal. Highlights PoS(EPS-HEP2019)713 Jon Butterworth (2018) no.7, 072001 (2002) 096014 97 65 (2019) no.21, 211803 (2018) 165 doi:10.1007/JHEP08(2018)165 122 (2019) 041 doi:10.1007/JHEP08(2019)041 1808 6 1909 [LHCb Collaboration], Phys. Rev. Lett. [LHCb Collaboration], JHEP [Super-Kamiokande Collaboration], Phys. Rev. D et al. et al. et al. doi:10.1103/PhysRevLett.122.211803 [arXiv:1903.08726 [hep-ex]]. doi:10.1103/PhysRevD.65.096014 [hep-ph/0201098]. [arXiv:1906.08297 [hep-ex]]. [arXiv:1805.11948 [hep-ph]]. doi:10.1103/PhysRevD.97.072001 [arXiv:1710.09126 [hep-ex]]. With the ongoing results from the LHC experiments, Belle II arriving, HyperK and DUNE I apologise to anyone I didn’t represent well, or at all, here. I already thanked the organisers [1] R. Aaij [2] R. Aaij [3] K. Abe [5] J. M. Butterworth, B. E. Cox and J. R. Forshaw, Phys. Rev. D [4] L. Cieri, G. Ferrera and G. F. R. Sborlini, JHEP on the horizon, continuing improvement inengagement theoretical and between experiment particle techniques physics, and aan astrophysics deepening exciting and snapshot nuclear of physics, aso. this field week I still has did digesting not provided themass mention implications directly charged-lepton of (its flavour value, the measurements, and results or whetherprospects of experiments there. it the probing is The main the last Majorana impression neutrino or decade I Diracattention or took in away to from nature), the the but far conference there is future, arerichness that and also while of we exciting it data, need contains and to therefore many pay possibility,much uncertainties, which work the should to next do inspire few to and make years excite this us promise a all. a reality. great But there isfor still the invitation. I would alsoof like Ghent to and thank its them brewers, and for the hosting local and organisers, attending colleagues, a and superb the conference. city References Highlights is part of the store ofthe human LHC knowledge, side, and CMS is have notsome led ours of the which to way has keep in been to opening used ourselves byby a in theorists Matthias subset to the of Schott, develop long new early a term. results, LHC member and On comparisons. data as of for shown ATLAS, in physics to This a analysis, perform parallel shows session openexperiments. opening cross-checks, new However, up such measurements our and activity dataconcern – to is especially by some, technically a and possible,would member may and be of even useful, a a be rival mistake. for discouraged collaborationwithin collider or the – While collaborations, seen causes there attempting as are, to a control forto what threat example, address colleagues by do those legitimate with the concerns, concerns public and collaborations. aboutfreedom. data in is shortage not my This Open of the opinion effort way data, crossesshould and an be its unacceptable at analysis, least line tolerated in willthis by terms in direction even of anyway. the the We academic most should end sceptical. go be enthusiastically, External not good pressures dragging are our for feet. pushing science the and field in innovation,9. and Conclusion PoS(EPS-HEP2019)713 Jon Butterworth (2019) no.1, L1 875 (2018) no.14, 142302 120 (2010) 091 doi:10.1007/JHEP09(2010)091 1009 7 [CMS Collaboration], Phys. Rev. Lett. [CMS Collaboration], JHEP [Event Horizon Telescope Collaboration], Astrophys. J. [ALICE Collaboration], arXiv:1905.02512 [nucl-ex]. et al. et al. , arXiv:1905.03764 [hep-ph]. et al. et al. et al. doi:10.3847/2041-8213/ab0ec7 [arXiv:1906.11238 [astro-ph.GA]]. [arXiv:1009.4122 [hep-ex]]. doi:10.1103/PhysRevLett.120.142302 [arXiv:1708.09429 [nucl-ex]]. [9] J. de Blas [8] V. Khachatryan [6] A. M. Sirunyan [7] S. Acharya [11] P. Athron [GAMBIT Collaboration], arXiv:1910.05906 [hep-ph]. [10] K. Akiyama Highlights