The ATLAS muon spectrometer comprises excellent muon trigger capabilities and high muon momentum resolution up to the TeV scale. Yet, in a small region between the barrel and end-cap parts of the muon spectrometer, a non-negligible muon trigger rate from charged particles not emerging from the pp interaction point has been observed. To prevent such fake triggers, the end of the inner ring of the muon spectrometer barrel in the barrel end-cap transition region, which is currently not equipped with trigger chambers, will be instrumented with resistive plate chambers (RPCs) in the next long shutdown of the LHC in 2019 and 2020. As the space in this region is extremely limited the present muon drift-tube chambers will have to be removed and replaced by an integrated system of thin-gap RPCs and small diameter muon drift-tube (sMDT) chambers. Final prototypes of both chambers have been successfully produced recently fulfilling all very tight spatial requirements and showing the expected performance. Results of mechanical measurements of the sMDT chamber geometry with a coordinate measurement machine show a wire positioning accuracy of better than $10$ µm. The tests of the thin-gap RPC in a high-energy muon beam at CERN show full chamber efficiency and an unprecedented time resolution better than $0.5$ ns. In the conference contribution the design, construction, and tests of the new sMDT and RPC chambers, as well as the progress of series production, will be presented.
{"title":"Phase I and II Upgrades of the ATLAS Muon Spectrometer with Integrated Small Diameter Drift Tube Chambers and Thin-Gap Resistive Plate Chambers","authors":"V. Walbrecht","doi":"10.22323/1.321.0083","DOIUrl":"https://doi.org/10.22323/1.321.0083","url":null,"abstract":"The ATLAS muon spectrometer comprises excellent muon trigger capabilities and high muon momentum resolution up to the TeV scale. Yet, in a small region between the barrel and end-cap parts of the muon spectrometer, a non-negligible muon trigger rate from charged particles not emerging from the pp interaction point has been observed. \u0000To prevent such fake triggers, the end of the inner ring of the muon spectrometer barrel in the barrel end-cap transition region, which is currently not equipped with trigger chambers, will be instrumented with resistive plate \u0000chambers (RPCs) in the next long shutdown of the LHC in 2019 and 2020. As the space in this region is extremely limited the present muon drift-tube chambers will have to be removed and replaced by an integrated system of thin-gap RPCs and small diameter muon drift-tube (sMDT) chambers. Final prototypes of both chambers have been successfully produced recently fulfilling all very tight spatial requirements and showing the expected performance. Results of mechanical measurements of the sMDT chamber geometry with a coordinate measurement machine show a wire positioning accuracy of better than $10$ µm. The tests of the thin-gap RPC in a high-energy muon beam at CERN show full chamber efficiency and an unprecedented time resolution better than $0.5$ ns. In the conference contribution the design, construction, and tests of the new sMDT and RPC chambers, as well as the progress of series production, will be presented.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124588625","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}
In this talk the recent progress in theoretical developments for single top production and top pair production in association with heavy vector bosons is reviewed. For top pair associated production, particular emphasis is put on complete-NLO predecitions, i.e.~predictions including all LO and NLO contributions in an expansion in both the strong and the electroweak couplings. For single-top production the three most relevant results that appeared this year are summarized.
{"title":"Theoretical status of single top and top associated production predictions","authors":"F. Rikkert","doi":"10.22323/1.321.0248","DOIUrl":"https://doi.org/10.22323/1.321.0248","url":null,"abstract":"In this talk the recent progress in theoretical developments for single top production and top pair production in association with heavy vector bosons is reviewed. For top pair associated production, particular emphasis is put on complete-NLO predecitions, i.e.~predictions including all LO and NLO contributions in an expansion in both the strong and the electroweak couplings. For single-top production the three most relevant results that appeared this year are summarized.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134130590","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}
The latest results on the $CP$ violation measurements in $B$ decays are reported. The measurement of the weak phase $phi_s^{soverline{s}}$ using the $B^0_s to phiphi$ decay mode is performed on a dataset corresponding to an integrated luminosity of $5,fb^{-1}$ collected in proton-proton collisions by the LHCb experiment. Results on the first ever measurement of the $CP$-violating phase $phi_s^{doverline{d}}$ using $B_s^0 to (K^+pi^-)(K^-pi^+)$ channel, based on $3,fb^{-1}$ of data, are summarised.
报道了$B$衰变中$CP$违和测量的最新结果。利用$B^0_s to phiphi$衰变模式对LHCb实验中质子-质子碰撞中收集到的$5,fb^{-1}$的综合光度数据集进行了弱相位$phi_s^{soverline{s}}$的测量。总结了基于$3,fb^{-1}$的数据，利用$B_s^0 to (K^+pi^-)(K^-pi^+)$通道首次测量$CP$ -违反相位$phi_s^{doverline{d}}$的结果。
{"title":"LHCb measurements on CPV in $B$ decays ($Brightarrow 3h$, $phi_s$, charmless $B$ decays)","authors":"E. Govorkova","doi":"10.22323/1.321.0175","DOIUrl":"https://doi.org/10.22323/1.321.0175","url":null,"abstract":"The latest results on the $CP$ violation measurements in $B$ \u0000decays are reported. The measurement of the weak phase $phi_s^{soverline{s}}$ \u0000using the $B^0_s to phiphi$ decay mode is performed on a dataset \u0000corresponding to an integrated luminosity of $5,fb^{-1}$ collected in \u0000proton-proton collisions by the LHCb experiment. Results on the first ever \u0000measurement of the $CP$-violating phase \u0000$phi_s^{doverline{d}}$ using $B_s^0 to (K^+pi^-)(K^-pi^+)$ channel, \u0000based on $3,fb^{-1}$ of data, are summarised.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130142295","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}
Studies of soft particle production play an important role in understanding the physics of heavy-ion collisions. Measurements of hadron yields are well described by grand-canonical thermal models in heavy-ion collisions, while an enhancement of strangeness production is observed in smaller collision systems. Several species of hadronic resonances are observed to be suppressed in central nucleus-nucleus collisions, likely due to scattering effects in the hadronic phase. The production mechanisms of nuclei can be studied through measurements of their yields, flow, and coalescence parameters. Hadron transverse-momentum spectra can be shaped by various effects, including radial flow and recombination; studies of the pT spectra of identified hadrons with different masses and quark content can help to gauge the importance of such effects for different system sizes. Recent measurements by the ALICE Collaboration related to these topics will be presented for a wide range of system sizes in pp, p–Pb, Pb–Pb, and Xe–Xe collisions at LHC energies.
{"title":"New results on soft particle production in heavy-ion collisions with ALICE","authors":"A. Knospe","doi":"10.22323/1.321.0217","DOIUrl":"https://doi.org/10.22323/1.321.0217","url":null,"abstract":"Studies of soft particle production play an important role in understanding the physics of heavy-ion collisions. Measurements of hadron yields are well described by grand-canonical thermal models in heavy-ion collisions, while an enhancement of strangeness production is observed in smaller collision systems. Several species of hadronic resonances are observed to be suppressed in central nucleus-nucleus collisions, likely due to scattering effects in the hadronic phase. The production mechanisms of nuclei can be studied through measurements of their yields, flow, and coalescence parameters. Hadron transverse-momentum spectra can be shaped by various effects, including radial flow and recombination; studies of the pT spectra of identified hadrons with different masses and quark content can help to gauge the importance of such effects for different system sizes. Recent measurements by the ALICE Collaboration related to these topics will be presented for a wide range of system sizes in pp, p–Pb, Pb–Pb, and Xe–Xe collisions at LHC energies.","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":"2018-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127921718","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}
In the upcoming upgrades for Run 3 and 4, the LHC will significantly increase Pb-Pb and pp interaction rates. This goes along with upgrades of all experiments, ALICE, ATLAS, CMS, and LHCb, related to both the detectors and the computing. The online processing farms must employ faster, more efficient reconstruction algorithms to cope with the increased data rates and data compression factors must increase to fit the data in the affordable capacity for permanent storage. Due to different operating conditions and aims, the experiments follow different approaches, but there are several common trends like more extensive online computing and the adoption of hardware accelerators. This paper gives an overview and compares the data processing approaches and the online computing farms of the LHC experiments today in Run 2 and for the upcoming LHC Run 3 and 4.
{"title":"Data processing and online reconstruction","authors":"D. Rohr","doi":"10.22323/1.321.0257","DOIUrl":"https://doi.org/10.22323/1.321.0257","url":null,"abstract":"In the upcoming upgrades for Run 3 and 4, the LHC will significantly increase Pb-Pb and pp interaction rates. \u0000This goes along with upgrades of all experiments, ALICE, ATLAS, CMS, and LHCb, related to both the detectors and the computing. \u0000The online processing farms must employ faster, more efficient reconstruction algorithms to cope with the increased data rates and data compression factors must increase to fit the data in the affordable capacity for permanent storage. \u0000Due to different operating conditions and aims, the experiments follow different approaches, but there are several common trends like more extensive online computing and the adoption of hardware accelerators. \u0000This paper gives an overview and compares the data processing approaches and the online computing farms of the LHC experiments today in Run 2 and for the upcoming LHC Run 3 and 4.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133288371","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}
Hard probes - final state particles related to an interaction with large momentum transfer or mass scale - play a distinguished role in the discovery and the study of the Quark-Gluon Plasma (QGP), a phase of deconfined quarks and gluons reached at high temperatures in heavy ion collisions. In heavy ion collisions, parton scatterings with a large momentum transfer ($1/Q ll 1$ fm/$c$) occur prior to QGP formation and thus provide a source of coloured probe particles for the QGP created in the later stage of the reaction. The hard scattered partons and the subsequent parton shower interact strongly with the QGP and its constituents via elastic and radiative processes before hadronization into jets of observable particles. Thus, the comparison to jet and high-$p_T$ observables in pp (vacuum) potentially probes their modification due to medium effects. One of the key observables in the discovery and investigation of these jet modifications has been the nuclear modification factor $R_{AA}$, for which new results on charged particle production in different colliding systems are presented and the question of apparant suppression in peripheral Pb-Pb collisions is addressed. Fore more differential studies of the jet sub-structure and hence the parton shower evolution in the medium, recent results on jet grooming in heavy ion colisions are presented.
{"title":"New results on hard probes in heavy-ion collisions with ALICE","authors":"C. Klein-Bosing","doi":"10.22323/1.321.0222","DOIUrl":"https://doi.org/10.22323/1.321.0222","url":null,"abstract":"Hard probes - final state particles related to an interaction with large momentum transfer or mass scale - play a distinguished role in the discovery and the study of the Quark-Gluon Plasma (QGP), a phase of deconfined quarks and gluons reached at high temperatures in heavy ion collisions. In heavy ion collisions, parton scatterings with a large momentum transfer ($1/Q ll 1$ fm/$c$) occur prior to QGP formation and thus provide a source of coloured probe particles for the QGP created in the later stage of the reaction. The hard scattered partons and the subsequent parton shower interact strongly with the QGP and its constituents via elastic and radiative processes before hadronization into jets of observable particles. Thus, the comparison to jet and high-$p_T$ observables in pp (vacuum) potentially probes their modification due to medium effects. One of the key observables in the discovery and investigation of these jet modifications has been the nuclear modification factor $R_{AA}$, for which new results on charged particle production in different colliding systems are presented and the question of apparant suppression in peripheral Pb-Pb collisions is addressed. Fore more differential studies of the jet sub-structure and hence the parton shower evolution in the medium, recent results on jet grooming in heavy ion colisions are presented.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128871904","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}
The CMS experiment implements a sophisticated two-level triggering system composed of the Level-1, instrumented by custom-design hardware boards, and a software High Level Trigger. A new Level-1 trigger architecture with improved performance is now being used to maintain high physics efficiency for the more challenging conditions experienced during Run II. The upgraded trigger benefits from an enhanced granularity of the calorimeters to optimally reconstruct electromagnetic objects. The performance of the new trigger system is presented, based on proton-proton collision data collected in 2017. We highlight the performance of the upgraded CMS electron and photon trigger in the context of Higgs boson decays into final states with photons and electrons. The selection techniques used to trigger efficiently on these benchmark analyses are presented, along with the strategies employed to guarantee efficient triggering for new resonances and other new physics signals involving electron and photon final states.
{"title":"The Level-1 CMS electron and photon trigger for the LHC Run II","authors":"Pantelis Kontaxakis","doi":"10.22323/1.321.0073","DOIUrl":"https://doi.org/10.22323/1.321.0073","url":null,"abstract":"The CMS experiment implements a sophisticated two-level triggering system composed of the Level-1, instrumented by custom-design hardware boards, and a software High Level Trigger. A new Level-1 trigger architecture with improved performance is now being used to maintain high physics efficiency for the more challenging conditions experienced during Run II. The upgraded trigger benefits from an enhanced granularity of the calorimeters to optimally reconstruct electromagnetic objects. The performance of the new trigger system is presented, based on proton-proton collision data collected in 2017. We highlight the performance of the upgraded CMS electron and photon trigger in the context of Higgs boson decays into final states with photons and electrons. The selection techniques used to trigger efficiently on these benchmark analyses are presented, along with the strategies employed to guarantee efficient triggering for new resonances and other new physics signals involving electron and photon final states.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"203 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133088721","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}
We discuss the recent results obtained in the context of PDF determination with the inclusion of logarithmic resummations and their phenomenological applications.
我们讨论了在包含对数恢复及其现象学应用的PDF测定的背景下获得的最新结果。
{"title":"Recent progress in PDF theory","authors":"M. Bonvini","doi":"10.22323/1.321.0205","DOIUrl":"https://doi.org/10.22323/1.321.0205","url":null,"abstract":"We discuss the recent results obtained in the context of PDF determination with the inclusion of logarithmic resummations and their phenomenological applications.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124704381","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}
The $W$ boson is a short lived particle which does not interact strongly. Thus its production rate measured in lepton decay channels can be compared between lead-lead and proton-proton collisions as a direct test of both binary collision scaling and the possible modification of parton distribution functions due to nuclear effects (nPDF). In Run 2 the ATLAS experiment has recorded 0.49 nb$^{-1}$ of lead-lead collision data at the center-of-mass energy of 5.02 TeV. The available $W$ boson sample is increased by a factor of eight relative to the Run 1 data sample collected at 2.76 TeV. This study presents $W^+$ and $W^-$ boson production yields measured differentially in lepton pseudorapidity and as a function of centrality.
{"title":"Measurement of W boson production in Pb+Pb collisions at 5.02 TeV with the ATLAS detector","authors":"P. Janus","doi":"10.22323/1.321.0022","DOIUrl":"https://doi.org/10.22323/1.321.0022","url":null,"abstract":"The $W$ boson is a short lived particle which does not interact strongly. Thus its production rate measured in lepton decay channels can be compared between lead-lead and proton-proton collisions as a direct test of both binary collision scaling and the possible modification of parton distribution functions due to nuclear effects (nPDF). In Run 2 the ATLAS experiment has recorded 0.49 nb$^{-1}$ of lead-lead collision data at the center-of-mass energy of 5.02 TeV. The available $W$ boson sample is increased by a factor of eight relative to the Run 1 data sample collected at 2.76 TeV. This study presents $W^+$ and $W^-$ boson production yields measured differentially in lepton pseudorapidity and as a function of centrality.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"2017 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115149621","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}
M. Antonelli, O. Blanco-García, M. Boscolo, S. Guiducci, M. Ricci, M. Rotondo, A. Lorenzon, D. Lucchesi, S. Rossini, S. Vanini, M. Zanetti, G. Ballerini, C. Brizzolari, V. Mascagna, M. Prest, M. Soldani, A. Bertolin, F. Gonella, S. Ventura, F. Anulli, F. Collamati, F. Iacoangeli, L. Bandiera, G. Cavoto, R. Nardo, E. Vallazza
These proceedings introduce a new proposal for a low-emittance muon collider. A low-emittance muon beam is obtained from the process e$^+$e$^-rightarrowmu^+mu^-$ with positrons at the threshold energy of 45 GeV. A first test beam to validate the low-emittance muon production concept will be presented.
这些程序介绍了一种低发射介子对撞机的新方案。在e $^+$ e $^-rightarrowmu^+mu^-$过程中获得了具有45 GeV阈值能量的正电子的低发射介子束。将提出验证低发射度μ子生产概念的第一个测试光束。
{"title":"New proposal for low-emittance muon collider","authors":"M. Antonelli, O. Blanco-García, M. Boscolo, S. Guiducci, M. Ricci, M. Rotondo, A. Lorenzon, D. Lucchesi, S. Rossini, S. Vanini, M. Zanetti, G. Ballerini, C. Brizzolari, V. Mascagna, M. Prest, M. Soldani, A. Bertolin, F. Gonella, S. Ventura, F. Anulli, F. Collamati, F. Iacoangeli, L. Bandiera, G. Cavoto, R. Nardo, E. Vallazza","doi":"10.22323/1.321.0256","DOIUrl":"https://doi.org/10.22323/1.321.0256","url":null,"abstract":"These proceedings introduce a new proposal for a low-emittance \u0000muon collider. A low-emittance muon beam is obtained from the process e$^+$e$^-rightarrowmu^+mu^-$ with positrons at the threshold energy of 45 GeV. A first test beam to validate the low-emittance muon production concept will be presented.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124747588","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}
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