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

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Searches for long-lived particles with LHCb 寻找具有LHCb的长寿命粒子
Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018) Pub Date : 2018-09-05 DOI: 10.22323/1.321.0281
Elena Dall'Occo
{"title":"Searches for long-lived particles with LHCb","authors":"Elena Dall'Occo","doi":"10.22323/1.321.0281","DOIUrl":"https://doi.org/10.22323/1.321.0281","url":null,"abstract":"Many theories with physics beyond the Standard Model involve particles with a detectable decay length from the interaction point. This contribution summarises the LHCb approach to long-lived particle searches, with some highlights on specific studies performed with Run I data.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114789319","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}
引用次数: 1
Searches for unconventional signatures with ATLAS 用ATLAS搜索非常规特征
Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018) Pub Date : 2018-09-05 DOI: 10.22323/1.321.0283
R. Kopeliansky
{"title":"Searches for unconventional signatures with ATLAS","authors":"R. Kopeliansky","doi":"10.22323/1.321.0283","DOIUrl":"https://doi.org/10.22323/1.321.0283","url":null,"abstract":"A review of exotic unconventional detector-signatures searches performed by the ATLAS experiment is presented. General introduction to unconventional searches is included, as well as selected detailed results based on data collected during early sqrt{s} = 13 TeV pp collisions at the LHC.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126225655","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}
引用次数: 0
New results on hard probes in heavy-ion collisions with LHCb 硬探测器与LHCb重离子碰撞的新结果
Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018) Pub Date : 2018-09-05 DOI: 10.22323/1.321.0221
F. Fleuret
{"title":"New results on hard probes in heavy-ion collisions with LHCb","authors":"F. Fleuret","doi":"10.22323/1.321.0221","DOIUrl":"https://doi.org/10.22323/1.321.0221","url":null,"abstract":"Since 2013, the LHCb collaboration extended its physics programme to the study of ion collisions. Thanks to its unique tracking and PID capabilities in the forward rapidity region, the LHCb detector can provide important results on heavy flavour production in proton-lead and lead-lead collisions at LHC. Moreover, LHCb has the unique capability to operate in a fixed-target configuration and study proton and ion-beam induced reactions on gaseous targets. In the following, we report on the results and performances on open and hidden heavy-flavour hadron production in proton-lead, lead-proton and lead-lead collisions, recorded in collider mode, and in proton-nucleus collisions, recorded in fixed target mode.","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":"2018-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125076781","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}
引用次数: 0
$brightarrow sll$ results from CMS $b右小写$是CMS的结果
Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018) Pub Date : 2018-09-05 DOI: 10.22323/1.321.0183
A. Boletti
{"title":"$brightarrow sll$ results from CMS","authors":"A. Boletti","doi":"10.22323/1.321.0183","DOIUrl":"https://doi.org/10.22323/1.321.0183","url":null,"abstract":"The flavour changing neutral current decays are interesting probes for new physics searches. The angular distributions of $b to s ell^+ ell^-$ transition processes of both $mathrm{B}^0 to mathrm{K}^{*0} mu^ +mu^-$ and $mathrm{B}^{+} to mathrm{K}^{+} mu^+mu^-$ decays are studied using a sample of proton-proton collisions at $sqrt{s} = 8~mathrm{TeV}$ collected with the CMS detector at the LHC, corresponding to an integrated luminosity of $20.5~mathrm{fb}^{-1}$. Angular analyses are performed to determine the angular parameters $P_1$ and $P_5'$ for $mathrm{B}^0 to mathrm{K}^{*0} mu^ +mu^-$ and $A_{FB}$ and $F_{H}$ parameters for $mathrm{B}^{+} to mathrm{K}^{+} mu^+mu^-$, as functions of the dimuon invariant mass squared. All the measurements are consistent with the standard model predictions.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128698647","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}
引用次数: 0
Measurement of the Higgs Self-Coupling in the HH ➝ VVbb Channel at the FCC-hh Collider FCC-hh对撞机HH ~ VVbb通道中希格斯自耦合的测量
Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018) Pub Date : 2018-09-05 DOI: 10.22323/1.321.0090
E. Fontanesi, S. Braibant
{"title":"Measurement of the Higgs Self-Coupling in the HH ➝ VVbb Channel at the FCC-hh Collider","authors":"E. Fontanesi, S. Braibant","doi":"10.22323/1.321.0090","DOIUrl":"https://doi.org/10.22323/1.321.0090","url":null,"abstract":"The measurement of the Higgs self-interaction is an important test of the Standard Model (SM) electroweak symmetry breaking sector. Sensitivity to the Higgs self-coupling for m$_{H}$ = 125 GeV is evaluated through the measurement of the non-resonant di-Higgs production final states in proton-proton collisions at a future hadron collider with a center-of-mass energy of 100 TeV. The parton-level generation of the signal and the backgrounds is performed by using MadGraph5$_$aMC@NLO; then, the Delphes framework is used for a fast parametrization of the FCC-hh detector response. The considered decay channels are $HH to VVbbar{b}$, where $V=Z,W$. For the non-resonant SM signal in an ideal detector parametrization, a precision of O(10%-20%) on the SM cross-section can be estimated in the $bbar{b}ZZ(4l)$ and $bbar{b}WW(lnu jj)$, respectively, corresponding to a precision of O(14%-40%) on the Higgs trilinear coupling.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125013985","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}
引用次数: 0
Search for $tbar t H$ production in high-$p_mathrm{T}$regimes with the ATLAS detector 用ATLAS探测器在高p_ mathm {t}$区域搜索$tbar $ H$产量
Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018) Pub Date : 2018-09-05 DOI: 10.22323/1.321.0005
S. Biondi
{"title":"Search for $tbar t H$ production in high-$p_mathrm{T}$regimes with the ATLAS detector","authors":"S. Biondi","doi":"10.22323/1.321.0005","DOIUrl":"https://doi.org/10.22323/1.321.0005","url":null,"abstract":"The associated production of the Higgs boson with a pair of top/anti-top quarks ($tbar t H$) is the only process providing the direct access to the measurement of the Yukawa coupling between the Higgs boson and the top quark. The presented results exploit the data collected during 2015 and 2016 by the ATLAS experiment during LHC collisions at a center-of-mass energy of 13 TeV. Multivariate analysis techniques are used in order to discriminate the signal from the very large backgrounds arising mainly from top-quark pair production. In addition, for the first time the analysis uses algorithms specifically designed to cope with the challenging reconstruction of hadronically decaying high-$p_mathrm{T}$ bosons and top quarks. The combined best fit value of the signal strength is found to be $0.84^{+0.64}_{-0.61}$, while a value greater than $2.0$ is excluded at 95% confidence level while the expected upper limit is $mu < 1.2$ in the absence of a $tbar t H$ signal.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127769091","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}
引用次数: 0
Experimental BSM prospects at the HL-LHC 在HL-LHC的实验BSM展望
Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018) Pub Date : 2018-09-05 DOI: 10.22323/1.321.0261
K. Hoepfner, Atlas Collaborations
{"title":"Experimental BSM prospects at the HL-LHC","authors":"K. Hoepfner, Atlas Collaborations","doi":"10.22323/1.321.0261","DOIUrl":"https://doi.org/10.22323/1.321.0261","url":null,"abstract":"This paper presents examples from the wealth of physics studies to determine the achievable sensitivity at the high-luminosity LHC. Beyond-the-standard-model (BSM) searches concern new heavy bosons, supersymmetric models, exotic signatures with displaced leptons and many more.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133829470","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}
引用次数: 0
Comparison studies for b tagging variables in data and simulation. 数据与仿真中b标记变量的比较研究。
Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018) Pub Date : 2018-09-04 DOI: 10.22323/1.321.0077
G. Paspalaki
{"title":"Comparison studies for b tagging variables in data and simulation.","authors":"G. Paspalaki","doi":"10.22323/1.321.0077","DOIUrl":"https://doi.org/10.22323/1.321.0077","url":null,"abstract":"The identification of jets originated from b quarks is crucial for a broad range of physics analyses. Various b tagging algorithms exist at CMS and are further developed with the use of the machine learning techniques. Constant monitoring of the basic quantities provided to the high-level taggers is fundamental to ensure a good tagging performance and to spot potential issues in the data taking. We present a comparison between the proton-proton collision data collected by the CMS detector in 2016 and simulation. The comparison is between the input variables used by the heavy flavour tagging algorithms and the taggers distributions in several event topologies.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127849340","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}
引用次数: 0
Production of pions, kaons and protons in Xe--Xe collisions at $sqrt{s}_{rm NN}$ = 5.44 TeV $sqrt{s}_{rm NN}$ = 5.44 TeV的Xe—Xe碰撞中介子、介子和质子的产生
Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018) Pub Date : 2018-09-04 DOI: 10.22323/1.321.0085
S. Ragoni
{"title":"Production of pions, kaons and protons in Xe--Xe collisions at $sqrt{s}_{rm NN}$ = 5.44 TeV","authors":"S. Ragoni","doi":"10.22323/1.321.0085","DOIUrl":"https://doi.org/10.22323/1.321.0085","url":null,"abstract":"In late 2017, the ALICE experiment recorded a data sample of Xe--Xe collisions at the unprecedented energy in A--A systems of $sqrt{s_{rm{NN}}} = 5.44text{ TeV}$. The $p_{rm T}$ spectra at mid-rapidity ($|y| < 0.5$) of pions, kaons and protons are presented. The preliminary $p_{rm T}$ spectra are obtained by combining independent analyses with the Inner Tracking System (ITS), the Time Projection Chamber (TPC), and the Time-Of-Flight (TOF) detectors. This paper focuses on the details of the analysis performed with TOF and in particular on the performance implications of the special Xe--Xe run conditions. The peculiarity of this data set comes from the experimental conditions: because of the lower magnetic field of the ALICE solenoid ($B = 0.2text{ T}$, lower than the nominal $0.5text{ T}$) we expect to explore a $p_{rm T}$ region unattainable before. A comparison between the yields at different centrality bins will also be provided.","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":"2018-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130088202","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}
引用次数: 2
New results on soft particle production in heavy-ion collisions with ATLAS 用ATLAS研究重离子碰撞软粒子产生的新结果
Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018) Pub Date : 2018-09-04 DOI: 10.22323/1.321.0218
A. Trzupek
{"title":"New results on soft particle production in heavy-ion collisions with ATLAS","authors":"A. Trzupek","doi":"10.22323/1.321.0218","DOIUrl":"https://doi.org/10.22323/1.321.0218","url":null,"abstract":"The measurement of flow $v_2$-$v_5$ harmonics in Xe+Xe collisions at the energy of $sqrt{s_{NN}}$ = 5.44~TeV were recently performed in the ATLAS experiment at the LHC. Results on the $p_T$ and centrality dependence of $v_n$ harmonics are presented. A comparison of the measured $v_n$ to Pb+Pb results and theoretical predictions is shown. The data indicate stronger event-to-event fluctuations of $v_n$ harmonics in the Xe+Xe collision system as compared to Pb+Pb collisions. For Pb+Pb collisions at the energy of $sqrt{s_{NN}}$ = 5.02 TeV, the modified Pearson's correlation coefficient for event-wise the mean transverse momentum and the square of the magnitude of flow harmonics is also. Significant, non-zero correlation coefficients for $v_2$, $v_3$ and $v_4$ harmonics are obtained. The coefficients weakly depend on the transverse momentum range of the selected particles. The coefficient for the second order harmonic is negative in peripheral events, has a significant positive value for mid-central events and drops in the most central collisions. Measured Pearson's coefficients are compared to model predictions.","PeriodicalId":346295,"journal":{"name":"Proceedings of Sixth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2018)","volume":"61 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120926493","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}
引用次数: 0
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