This plenary talk briefly reviews recent theory progress for top quark production at the LHC and the impact of precision calculations on physics analyses in the Standard Model and beyond.
{"title":"Top quark physics","authors":"M. Schulze","doi":"10.22323/1.321.0135","DOIUrl":"https://doi.org/10.22323/1.321.0135","url":null,"abstract":"This plenary talk briefly reviews recent theory progress for top quark production at the LHC and the impact of precision calculations on physics analyses in the Standard Model and beyond.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132207935","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 motivation for dark matter searches at the LHC and the models used to perform these searches are presented. A particular focus is placed on the advantages and disadvantages of renormalisable mediator models, followed by a discussion of their central predictions. The case of mono-Higgs signals is considered in further detail for illustration, followed by an outlook on the activities of the LHC Dark Matter Working Group.
{"title":"Theory interpretations and challenges of DM searches","authors":"F. Kahlhoefer","doi":"10.22323/1.321.0128","DOIUrl":"https://doi.org/10.22323/1.321.0128","url":null,"abstract":"The motivation for dark matter searches at the LHC and the models used to perform these searches \u0000are presented. A particular focus is placed on the advantages and disadvantages of renormalisable \u0000mediator models, followed by a discussion of their central predictions. The case of mono-Higgs \u0000signals is considered in further detail for illustration, followed by an outlook on the activities of \u0000the LHC Dark Matter Working Group.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114600508","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}
Preliminary studies into the potential measurement of the (anti)deuteron production cross-section in proton-proton collisions at LHCb are presented. The expected (anti)deuteron yield is seen to be low relative to other charged tracks, but the excellent particle identification capabilities of LHCb may ensure that a measurement is possible.
{"title":"Antideuteron sensitivity studies at LHCb","authors":"S. Baker","doi":"10.22323/1.321.0078","DOIUrl":"https://doi.org/10.22323/1.321.0078","url":null,"abstract":"Preliminary studies into the potential measurement of the (anti)deuteron production cross-section in proton-proton collisions at LHCb are presented. The expected (anti)deuteron yield is seen to be low relative to other charged tracks, but the excellent particle identification capabilities of LHCb may ensure that a measurement is possible.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114338130","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}
A precise measurement of luminosity is a key component of both the ATLAS and CMS physics programmes at LHC: its uncertainty is one of the dominant systematics for both Standard Model cross section measurements and enters new physics searches. The different strategies used by the two collaborations to assess the luminosity and the methods to absolutely calibrate it are here described, together with the dominant systematic uncertainties. The preliminary luminosity uncertainty obtained for 2017 data is 2.4% for ATLAS and 2.3% for CMS.
{"title":"Luminosity Measurements in ATLAS and CMS during pp data taking at LHC","authors":"S. Valentinetti, Cms Collaborations","doi":"10.22323/1.321.0234","DOIUrl":"https://doi.org/10.22323/1.321.0234","url":null,"abstract":"A precise measurement of luminosity is a key component of both the ATLAS and CMS physics programmes at LHC: its uncertainty is \u0000one of the dominant systematics for both Standard Model cross section measurements and enters new physics searches. The different \u0000strategies used by the two collaborations to assess the luminosity and the methods to absolutely calibrate it are here described, \u0000together with the dominant systematic uncertainties. The preliminary luminosity uncertainty obtained for 2017 data is 2.4% for ATLAS \u0000and 2.3% for CMS.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127570967","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}
Procedures employed for the reconstruction of charged particle tracks used by the ATLAS experiment are outlined, and their performance in recent LHC Run 2 data is discussed, with focus on aspects such as the stability with respect to time and instantaneous luminosity, and performance within high-$p_T$ jets. The track-based alignment of the ATLAS Inner Detector is introduced, and its importance to track reconstruction is demonstrated. The current level of understanding of detector deformations affecting track parameter determination is shown, and planned future improvements are outlined. Methods devised to distinguish $b-$ and $c-$quark jets from light-flavour jets are introduced. Techniques to extract and calibrate the performance of these methods on data and Monte Carlo are examined, and their results compared. Finally, forthcoming improvements in these areas are highlighted.
概述了用于ATLAS实验的带电粒子轨道重建的程序，并讨论了它们在最近的LHC Run 2数据中的性能，重点讨论了时间和瞬时光度的稳定性以及在高p_T射流中的性能。介绍了ATLAS内探测器的轨迹对准方法，论证了其对轨道重建的重要性。显示了目前对探测器变形影响轨道参数确定的理解水平，并概述了计划的未来改进。介绍了从轻味喷流中区分$b-$和$c-$夸克喷流的方法。研究了提取和校准这些方法在数据和蒙特卡罗上的性能的技术，并比较了它们的结果。最后，强调了这些领域即将进行的改进。
{"title":"Tracking, alignment, and b-tagging performance and prospects in the ATLAS experiment","authors":"N. Styles","doi":"10.22323/1.321.0225","DOIUrl":"https://doi.org/10.22323/1.321.0225","url":null,"abstract":"Procedures employed for the reconstruction of charged particle tracks used by the ATLAS experiment are outlined, and their performance in recent LHC Run 2 data is discussed, with focus on aspects such as the stability with respect to time and instantaneous luminosity, and performance within high-$p_T$ jets. The track-based alignment of the ATLAS Inner Detector is introduced, and its importance to track reconstruction is demonstrated. The current level of understanding of detector deformations affecting track parameter determination is shown, and planned future improvements are outlined. Methods devised to distinguish $b-$ and $c-$quark jets from light-flavour jets are introduced. Techniques to extract and calibrate the performance of these methods on data and Monte Carlo are examined, and their results compared. Finally, forthcoming improvements in these areas are highlighted.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128965758","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 $C!P$ violation measurements represent one of the key topic covered by the LHCb collaboration. The time-dependent $C!P$ violation measurements requires the knowledge of the flavour at production of the $B$ signal candidate, thus the flavour tagging tool represents a fundamental ingredient for this kind of analyses. In this contribution the most recent results in the flavour tagging achieved at the LHCb experiment are highlighted.
$ C !P$违和测量是LHCb合作所涵盖的关键主题之一。与时间相关的$C!P$违规测量需要在产生$B$信号候选时了解味道，因此味道标记工具代表了这种分析的基本成分。在这个贡献中，在LHCb实验中获得的风味标签的最新结果得到了强调。
{"title":"Flavour Tagging in the LHCb experiment","authors":"Davide Fazzini","doi":"10.22323/1.321.0230","DOIUrl":"https://doi.org/10.22323/1.321.0230","url":null,"abstract":"The $C!P$ violation measurements represent one of the key topic covered by the LHCb collaboration. \u0000The time-dependent $C!P$ violation measurements requires the knowledge of the flavour at production of the $B$ signal candidate, thus the flavour tagging tool represents a fundamental ingredient for this kind of analyses. In this contribution the most recent results in the flavour tagging achieved at the LHCb experiment are highlighted.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132356089","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}
Precise measurements of the Higgs boson Yukawa couplings provide important tests of the Standard Model of particle physics. This review summarizes the current status of the analyses performed by the ATLAS and CMS experiments that search for the Higgs boson decay into a pair of muons. Additionally, two measurements in the Higgs boson decay channel into a pair of tau leptons are presented. The first analysis discussed was performed by the ATLAS collaboration and targets Higgs bosons produced via vector boson fusion and gluon fusion. The second presented analysis is a search performed by the CMS collaboration targeting Higgs bosons produced in association with a vector boson.
{"title":"Experimental results using the decay of the Higgs boson to tau leptons and muons","authors":"M. Meyer, Cms Collaborations","doi":"10.22323/1.321.0152","DOIUrl":"https://doi.org/10.22323/1.321.0152","url":null,"abstract":"Precise measurements of the Higgs boson Yukawa couplings provide important tests of the Standard Model of particle physics. This review summarizes the current status of the analyses performed by the ATLAS and CMS experiments that search for the Higgs boson decay into a pair of muons. Additionally, two measurements in the Higgs boson decay channel into a pair of tau leptons are presented. The first analysis discussed was performed by the ATLAS collaboration and targets Higgs bosons produced via vector boson fusion and gluon fusion. The second presented analysis is a search performed by the CMS collaboration targeting Higgs bosons produced in association with a vector boson.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128053217","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}
Results from the Dijet resonance search using 35.9 $mathrm{fb^{-1}}$ of pp collision data collected with the CMS experiment at the LHC in 2016 running will be shown, with emphasis on wide resonances, for resonance masses above 1.6 TeV and focusing on simplified models of Dark Matter for the interpretation of the experimental results.
{"title":"Hunting for wide resonances in the dijet mass spectrum at CMS","authors":"D. Karasavvas","doi":"10.22323/1.321.0060","DOIUrl":"https://doi.org/10.22323/1.321.0060","url":null,"abstract":"Results from the Dijet resonance search using 35.9 $mathrm{fb^{-1}}$ of pp collision data collected with the CMS experiment at the LHC in 2016 running will be shown, with emphasis on wide resonances, for resonance masses above 1.6 TeV and focusing on simplified models of Dark Matter for the interpretation of the experimental results.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117311412","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}
A search for a new scalar particle decaying to a pair of photon-jets---collimated groupings of photons---is performed with the ATLAS detector at the Large Hadron Collider. The dataset of $ pp $ collisions at a centre-of-mass energy of $ 13~mathrm{TeV}$ was collected in 2015 and 2016, corresponding to an intergrated luminosity of $ 36.7~mathrm{fb}^{-1} $. Photon-jets arise when a high-mass scalar particle decays into a pair of light particles, which consecutively decay to photons. When these light particles are highly boosted, their decay to photons lead to photon-jets. Candidate events with a pair of photon-jets are searched for in events containing two reconstructed photons with high transverse energy. No statistically significant excess of events from the background expectation is observed. The results are interpreted in the scenario of a scalar particle with a narrow width ($ X $) decaying into a pair of spin-0 particles ($ a $). Upper limits are placed on the product of the cross-section and branching ratios $sigma times {mathcal {B}}(X rightarrow aa) times {mathcal {B}}(a rightarrow gamma gamma)^{2}$ and $sigma times {mathcal {B}}(X rightarrow aa) times {mathcal {B}}(a rightarrow 3pi^{0})^{2}$ for the ranges $ 200~mathrm{GeV}
{"title":"Search for pairs of highly collimated groupings of photons at 13 TeV with the ATLAS detector","authors":"Y. Kano","doi":"10.22323/1.321.0013","DOIUrl":"https://doi.org/10.22323/1.321.0013","url":null,"abstract":"A search for a new scalar particle decaying to a pair of photon-jets---collimated groupings of photons---is performed with the ATLAS detector at the Large Hadron Collider. The dataset of $ pp $ collisions at a centre-of-mass energy of $ 13~mathrm{TeV}$ was collected in 2015 and 2016, corresponding to an intergrated luminosity of $ 36.7~mathrm{fb}^{-1} $. Photon-jets arise when a high-mass scalar particle decays into a pair of light particles, which consecutively decay to photons. When these light particles are highly boosted, their decay to photons lead to photon-jets. Candidate events with a pair of photon-jets are searched for in events containing two reconstructed photons with high transverse energy. No statistically significant excess of events from the background expectation is observed. The results are interpreted in the scenario of a scalar particle with a narrow width ($ X $) decaying into a pair of spin-0 particles ($ a $). Upper limits are placed on the product of the cross-section and branching ratios $sigma times {mathcal {B}}(X rightarrow aa) times {mathcal {B}}(a rightarrow gamma gamma)^{2}$ and $sigma times {mathcal {B}}(X rightarrow aa) times {mathcal {B}}(a rightarrow 3pi^{0})^{2}$ for the ranges $ 200~mathrm{GeV}","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":"2018-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129936695","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 rich dynamics available within the decay of heavy flavour baryons provides a laboratory to study the interplay between strong and weak dynamics, as well as allowing many amplitudes in which physics beyond the Standard Model can enter. This contribution will highlight several recent results from the LHCb experiment on $CP$ and baryon number violation.
{"title":"$CP$ violation and related measurements with baryons at LHCb","authors":"A. Pearce","doi":"10.22323/1.321.0188","DOIUrl":"https://doi.org/10.22323/1.321.0188","url":null,"abstract":"The rich dynamics available within the decay of heavy flavour baryons provides a laboratory to study the interplay between strong and weak dynamics, as well as allowing many amplitudes in which physics beyond the Standard Model can enter. This contribution will highlight several recent results from the LHCb experiment on $CP$ and baryon number violation.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132314150","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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