Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)最新文献

{"title":"Muon Identification and Isolation efficiencies on Run II data with the CMS experiment","authors":"P. Manteca","doi":"10.22323/1.321.0068","DOIUrl":"https://doi.org/10.22323/1.321.0068","url":null,"abstract":"The performance of muon identification and isolation efficiencies in CMS has been studied on data collected in proton-proton collisions at 13 TeV at the LHC on the full 2016 dataset. The efficiencies have been computed with the tag-and-probe method, in different periods of data taking. Results obtained using data are compared with Monte-Carlo predictions.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132152397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Forward Physics with the LHCf Experiment","authors":"A. Tricomi","doi":"10.22323/1.321.0207","DOIUrl":"https://doi.org/10.22323/1.321.0207","url":null,"abstract":"In 2016 the LHCf experiment has fulfilled its original \u0000 goal of measuring the spectra of the neutral particles \u0000 produced in the very forward direction at LHC at the highest \u0000 energy ever available. The main purpose of these measurements \u0000 is indeed to provide the Cosmic Ray and High Energy Physics \u0000 communities with a missing unique set of information for the \u0000 improvement of the hadronic interaction models used to \u0000 simulate air showers development produced in the interaction \u0000 of primary High Energy Cosmic Rays (HECR) with the Earth \u0000 atmosphere. The last data sets collected by the LHCf \u0000 experiment have been obtained during p+p collisions, at an \u0000 energy of 13 TeV in the CM frame, and p+Pb collision, at an \u0000 energy of 5.2 TeV and 8.1 TeV in \u0000 the nucleon-nucleon CM frame. A review of the main results of LHCf and of the \u0000 recent and on-going activities will be presented.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"269 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123288366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Searches for Dark Matter with CMS","authors":"S. Ahuja","doi":"10.22323/1.321.0284","DOIUrl":"https://doi.org/10.22323/1.321.0284","url":null,"abstract":"A summary of the current status of dark matter searches from the CMS experiment is presented, using up to 35.9 fb$^{-1}$ of data collected at 13 TeV in 2016. Various analyses covering mono-object searches along with searches for dark matter mediators are presented. The results are interpreted using simplified models for dark matter.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"745 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115132273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On the spin correlations of final leptons produced in the annihilation processes $e^+ e^- to mu^+ mu^-, tau^+ tau^-$ and in the high-energy two-photon processes $gamma gamma to e^+ e^-, mu^+ mu^-, tau^+ tau^-$","authors":"V. Lyuboshitz, V. Lyuboshitz","doi":"10.22323/1.321.0001","DOIUrl":"https://doi.org/10.22323/1.321.0001","url":null,"abstract":"The electromagnetic processes of annihilation of $(e^+ e^-)$ pairs, \u0000 generated in high-energy nucleus-nucleus and hadron-nucleus collisions, \u0000 into heavy flavor lepton pairs are \u0000 theoretically studied in the one-photon approximation, using the technique of \u0000 helicity amplitudes . For the process $e^+e^- rightarrow mu^+mu^-$, it is \u0000 shown that -- in the case of the unpolarized electron and positron -- the final \u0000 muons are also unpolarized but their spins are strongly correlated. For the \u0000 final $(mu^+ mu^-)$ system, the structure of triplet states is analyzed and \u0000 explicit expressions for the components of the spin density matrix and \u0000 correlation tensor are derived. It is demonstrated that here the spin correlations \u0000 of muons have the purely quantum character, since one of the Bell-type \u0000 incoherence inequalities for the correlation tensor components is always violated \u0000 ( i.e. there is always one case when the modulus of sum of two diagonal components \u0000 exceeds unity ). Besides, the additional contribution of the weak interaction of lepton \u0000 neutral currents through the virtual $Z^0$ boson is considered in detail, and \u0000 it is established that, when involving the weak interaction contribution, the \u0000 qualitative character of the muon spin correlations does not change. \u0000 \u0000 On the other hand, the theoretical investigation of spin structure for the \u0000 processes of lepton pair production by pairs of photons ( which, in particular, \u0000 may be emitted in relativistic heavy-ion and hadron-nucleus collisions ) is \u0000 performed as well. For the two-photon process $gamma gamma rightarrow \u0000 e^+ e^-$, it is found that -- quite similarly to \u0000the process $e^+ e^- \u0000 rightarrow mu^+ mu^-$ -- in the case of unpolarized photons the final electron \u0000 and positron remain unpolarized, but their spins prove to be strongly correlated. \u0000 Explicit expressions for the components of the correlation tensor and for \u0000 the relative fractions of singlet and triplet states of the final $(e^+ e^-)$ \u0000 system are derived. Again, here one of the Bell-type incoherence inequalities \u0000 for the correlation tensor components is always violated and, thus, spin \u0000 correlations of the electron and positron have the strongly pronounced quantum \u0000 character. \u0000 \u0000 Analogous analysis can be wholly applied as well, respectively, to the annihilation process \u0000$e^+ e^- rightarrow tau^+ tau^-$ and to the two-photon processes $gamma gamma rightarrow mu^+ mu^-$, $gamma gamma rightarrow tau^+ tau^-$, \u0000 which become possible at considerably higher energies.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132430477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Latest results on diboson and multiboson production from ATLAS experiment","authors":"T. Kharlamova","doi":"10.22323/1.321.0287","DOIUrl":"https://doi.org/10.22323/1.321.0287","url":null,"abstract":"These proceedings are presenting an overview of the diboson and multiboson production cross-section results obtained by the ATLAS collaboration using proton-proton collisions at the LHC at CERN. The note is focused on the latest measurements of $ZZ$, $W^±Z$, $W^+W^-$ production at $sqrt{s}$=13 TeV, of $W^+W^-$ and $W^±Z$ production in the semileptonic final state at 8 TeV and of triboson production at 8 TeV. Constraints on anomalous triple and quartic gauge boson couplings obtained from these measurements are briefly discussed as well. At present the measured cross sections are found to be in agreement with the Standard Model predictions within the estimated uncertainties.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114871343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Prototype of Machine Learning “as a Service” for CMS Physics in Signal vs Background discrimination","authors":"L. Giommi, D. Bonacorsi, V. Kuznetsov","doi":"10.22323/1.321.0093","DOIUrl":"https://doi.org/10.22323/1.321.0093","url":null,"abstract":"Big volumes of data are collected and analyzed by LHC experiments at CERN. The success of this scientific challenges is ensured by a great amount of computing power and storage capacity, operated over high performance networks, in very complex LHC computing models on the LHC Computing Grid infrastructure. Now in Run-2 data taking, LHC has an ambitious and broad experimental programme for the coming decades: it includes large investments in detector hardware, and similarly it requires commensurate investment in the R&D in software and computing to acquire, manage, process and analyze the shear amounts of data to be recorded in the High-Luminosity LHC (HL-LHC) era. \u0000 \u0000The new rise of Artificial Intelligence - related to the current Big Data era, to the technological progress and to a bump in resources democratization and efficient allocation at affordable costs through cloud solutions - is posing new challenges but also offering extremely promising techniques, not only for the commercial world but also for scientific enterprises such as HEP experiments. Machine Learning and Deep Learning are rapidly evolving approaches to characterising and describing data with the potential to radically change how data is reduced and analyzed, also at LHC. \u0000 \u0000This work aims at contributing to the construction of a Machine Learning ``as a service'' solution for CMS Physics needs, namely an end-to-end data-service to serve Machine Learning trained model to the CMS software framework. To this ambitious goal, this work contributes firstly with a proof of concept of a first prototype of such infrastructure, and secondly with a specific physics use-case: the Signal versus Background discrimination in the study of CMS all-hadronic top quark decays, done with scalable Machine Learning techniques.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115386703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Jets plus $gamma$/Z in ATLAS","authors":"B. Giacobbe","doi":"10.22323/1.321.0195","DOIUrl":"https://doi.org/10.22323/1.321.0195","url":null,"abstract":"Recent measurements performed by ATLAS involving the associated production of jets with \u0000prompt photons or Z bosons in proton-proton collisions at sqrt(s) = 13 TeV at LHC are presented. \u0000Differential cross-section measurements of such processes with respect to several kinematic variables \u0000and in different phase-space regions are used to probe both the QCD and EW sectors of \u0000the interactions. Experimental results are compared to state-of-art calculations and Monte Carlo \u0000simulations.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"145 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126815494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SUSY at the LHC","authors":"B. Dutta","doi":"10.22323/1.321.0160","DOIUrl":"https://doi.org/10.22323/1.321.0160","url":null,"abstract":"In this talk I discuss the status of supersymmetry(SUSY) models in the light of the current experimental data from the Large Hadron Collider (LHC). I discuss the surviving SUSY scenarios and their possible origins. I also discuss the search strategies to investigate these models at the ongoing LHC.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125351917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Production, spectroscopy and properties of heavy hadrons","authors":"M. Galanti, A. Alice, LHCb collaborations","doi":"10.22323/1.321.0132","DOIUrl":"https://doi.org/10.22323/1.321.0132","url":null,"abstract":"In this report I will describe the latest results of the ALICE, ATLAS, CMS, and LHCb experiments in the fields of production, spectroscopy, and properties of heavy hadrons. In particular, I will concentrate on measurements of quarkonium production cross sections, polarization, and mass, on measurements of production cross sections and lifetimes of open heavy flavors, on the recent observations of new states and decay modes, and on other searches for new and exotic hadrons.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127532682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Overview of jet quenching and energy loss in heavy-ion collisions","authors":"L. Apolinário","doi":"10.22323/1.321.0219","DOIUrl":"https://doi.org/10.22323/1.321.0219","url":null,"abstract":"This talk covers the latest theory developments related to the jet-quenching phenomenon and energy loss in nucleus-nucleus collisions with a focus on the lead-lead system. In particular, an attempt is made to interpret the latest heavy-ion results in the jet physics sector using a broad range of observables e.g. inclusive $R_{AA}$, dijet asymmetry, jet fragmentation functions and sensitivity of jet substructure to jet-induced medium response.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134624205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}