471 research outputs found
Author Correction: A portrait of the Higgs boson by the CMS experiment ten years after the discovery (Nature, (2022), 607, 7917, (60-68), 10.1038/s41586-022-04892-x)
No full textCorrection to: Nature Published online 4 July 2022 In the version of this article initially published, CMS Collaboration author names, affiliations and acknowledgements were omitted and have now been included in the HTML and PDF versions of the article.SCOAP
Author Correction: A portrait of the Higgs boson by the CMS experiment ten years after the discovery
No full textIn the version of this article initially published, CMS Collaboration author names, affiliations and acknowledgements were omitted and have now been included in the HTML and PDF versions of the article.Publisher versio
A portrait of the Higgs boson by the CMS experiment ten years after the discovery
Get PDFIn July 2012, the ATLAS and CMS Collaborations at the CERN Large Hadron
Collider announced the observation of a Higgs boson at a mass of around 125
GeV. Ten years later, and with the data corresponding to the production of 30
times larger number of Higgs bosons, we have learnt much more about the
properties of the Higgs boson. The CMS experiment has observed the Higgs boson
in numerous fermionic and bosonic decay channels, established its spin-parity
quantum numbers, determined its mass and measured its production cross sections
in various modes. Here the CMS Collaboration reports the most up-to-date
combination of results on the properties of the Higgs boson, including the most
stringent limit on the cross section for the production of a pair of Higgs
bosons, on the basis of data from proton-proton collisions at a centre-of-mass
energy of 13 TeV. Within the uncertainties, all these observations are
compatible with the predictions of the standard model of elementary particle
physics. Much evidence points to the fact that the standard model is a
low-energy approximation of a more comprehensive theory. Several of the
standard model issues originate in the sector of Higgs boson physics. An order
of magnitude larger number of Higgs bosons, expected to be examined over the
next fifteen years, will help deepen our understanding of this crucial sector.Comment: Replaced with the published version. Added the journal reference and
the DOI. All the figures and tables can be found at
http://cms-results.web.cern.ch/cms-results/public-results/publications/HIG-22-001
(CMS Public Pages). THis version contains the author list and acknowledgment
Combination of inclusive top-quark pair production cross-section measurements using ATLAS and CMS data at = 7 and 8 TeV
Get PDFA preprint version of this article is available at arXiv:2205.13830v2 [hep-ex], https://arxiv.org/abs/2205.13830 . Submission istory: [v2] Tue, 5 Sep 2023 12:43:58 UTC (484 KB). Comments: 59 pages in total, author lists starting at page 24, 4 figures, 6 tables. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2018-39 and at https://cms-results.web.cern.ch/cms-results/public-results/publications/TOP-18-014/index.html . Report number: CERN-EP-2021-222.A combination of measurements of the inclusive top-quark pair production cross-section performed by ATLAS and CMS in proton-proton collisions at centre-of-mass energies of 7 and 8 TeV at the LHC is presented. The cross-sections are obtained using top-quark pair decays with an opposite-charge electron-muon pair in the final state and with data corresponding to an integrated luminosity of about 5 fb−1 at √s = 7 TeV and about 20 fb−1 at √s = 8 TeV for each experiment. The combined cross-sections are determined to be 178.5±4.7 pb at √s = 7 TeV and 243.3+6.0−5.9 pb at √s = 8 TeV with a correlation of 0.41, using a reference top-quark mass value of 172.5 GeV. The ratio of the combined cross-sections is determined to be R8/7=1.363±0.032. The combined measured cross-sections and their ratio agree well with theory calculations using several parton distribution function (PDF) sets. The values of the top-quark pole mass (with the strong coupling fixed at 0.118) and the strong coupling (with the top-quark pole mass fixed at 172.5 GeV) are extracted from the combined results by fitting a next-to-next-to-leading-order plus next-to-next-to-leading-log QCD prediction to the measurements. Using a version of the NNPDF3.1 PDF set containing no top-quark measurements, the results obtained are mpolet=173.4+1.8−2.0 GeV and αs(mZ)=0.1170+0.0021−0.0018.SCOAP3
Alignment of the CMS silicon strip tracker during stand-alone commissioning
Get PDFThis is the Pre-print version of the Article. The official published version of the paper can be accessed from the link below - Copyright @ 2009 IOPThe results of the CMS tracker alignment analysis are presented using the data from cosmic tracks, optical survey information, and the laser alignment system at the Tracker Integration Facility at CERN. During several months of operation in the spring and summer of 2007, about five million cosmic track events were collected with a partially active CMS Tracker. This allowed us to perform first alignment of the active silicon modules with the cosmic tracks using three different statistical approaches; validate the survey and laser alignment system performance; and test the stability of Tracker structures under various stresses and temperatures ranging from +15C to -15C. Comparison with simulation shows that the achieved alignment precision in the barrel part of the tracker leads to residual distributions similar to those obtained with a random misalignment of 50 (80) microns in the outer (inner) part of the barrel.This work has been supported by: the Austrian Federal Ministry of Science and Research; the Belgium Fonds de la Recherche Scientifique and Fonds voor Wetenschappelijk Onderzoek; the Academy of Finland and
Helsinki Institute of Physics; the Institut National de Physique Nucléaire et de Physique des Particules / CNRS, France; the Bundesministerium für Bildung und Forschung, Germany; the Istituto Nazionale di Fisica Nucleare, Italy; the Swiss Funding Agencies; the Science and Technology Facilities Council, UK; the US Department of Energy, and National Science Foundation. Individuals
have received support from the Marie-Curie IEF program (European Union) and the A. P. Sloan Foundation
Erratum to: Measurement of the top quark mass with lepton+jets final states using pp collisions at √s = 13 TeV (The European Physical Journal C, (2018), 78, 11, (891), 10.1140/epjc/s10052-018-6332-9)
No full textThe Original Article was published on 02 November 2018Copyright © CERN for the benefit of the CMS collaboration 2022. 1 Erratum to: Eur. Phys. J. C (2018) 78:891 https://doi.org/10.1140/epjc/s10052-018-6332-9
In this article the author name Luigi Calligaris was incorrectly written as A. Calligaris. The original article has been corrected.SCOAP3
Erratum to: Search for new physics in dijet angular distributions using proton-proton collisions at s = 13 TeV and constraints on dark matter and other models (The European Physical Journal C, (2018), 78, 9, (789), 10.1140/epjc/s10052-018-6242-x)
No full textCopyright © CERN for the benefit of the CMS collaboration 2022. 1 Erratum to: Eur. Phys. J. C (2018) 78:789 https://doi.org/10.1140/epjc/s10052-018-6242-x
In this article the author name Luigi Calligaris was incorrectly written as A. Calligaris. The original article has been corrected.SCOAP
Measurement of WZ and ZZ production in pp collisions at √s = 8 TeV in final states with b-tagged jets
Get PDFOpen Access This article is distributed under the terms of the Creative
Commons Attribution License which permits any use, distribution, and
reproduction in any medium, provided the original author(s) and the
source are credited.
Funded by SCOAP3 / License Version CC BY 4.0.Measurements are reported of the WZ and ZZ production cross sections in proton-proton collisions at s √ =8 TeV in final states where one Z boson decays to b-tagged jets. The other gauge boson, either W or Z, is detected through its leptonic decay (either W→eν , μν or Z→e + e − , μ + μ − , or νν ¯ ). The results are based on data corresponding to an integrated luminosity of 18.9 fb −1 collected with the CMS detector at the Large Hadron Collider. The measured cross sections, σ(pp→WZ)=30.7±9.3(stat.)±7.1(syst.)±4.1(th.)±1.0(lum.)pb and σ(pp→ZZ)=6.5±1.7(stat.)±1.0(syst.)±0.9(th.)±0.2(lum.)pb , are consistent with next-to-leading order quantum chromodynamics calculationsBMWF and FWF (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, and FAPESP (Brazil);
MES (Bulgaria); CERN; CAS, MoST, and NSFC (China); COLCIENCIAS (Colombia); MSES and CS (Croatia); RPF (Cyprus); MoER, SF0690030s09 and ERDF (Estonia); Academy of Finland, MEC, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF(Germany);GSRT(Greece);OTKAand NIH(Hungary);DAEand DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); NRF and WCU (Republic of Korea); LAS (Lithuania);MOE and UM(Malaysia); CINVESTAV, CONACYT, SEP, and UASLP-FAI (Mexico); MBIE (New Zealand); PAEC (Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Dubna); MON, RosAtom, RAS and RFBR (Russia); MESTD (Serbia); SEIDI and CPAN (Spain); Swiss Funding Agencies (Switzerland);
NSC (Taipei); ThEPCenter, IPST, STAR and NSTDA(Thailand); TUBITAK and TAEK (Turkey); NASU and SFFR (Ukraine); STFC (United Kingdom); DOE and NSF (USA)
Strategies and performance of the CMS silicon tracker alignment during LHC Run 2
No full textCopyright © 2022 The Author(s). The strategies for and the performance of the CMS silicon tracking system alignment during the 2015–2018 data-taking period of the LHC are described. The alignment procedures during and after data taking are explained. Alignment scenarios are also derived for use in the simulation of the detector response. Systematic effects, related to intrinsic symmetries of the alignment task or to external constraints, are discussed and illustrated for different scenarios
Search for pair-produced vector-like leptons in final states with third-generation leptons and at least three b quark jets in proton-proton collisions at √s = 13 TeV
Get PDFData availability: Release and preservation of data used by the CMS Collaboration as the basis for publications is guided by the CMS policy as stated in “CMS data preservation, re-use and open access policy”.A preprint was made available at arXiv, arXiv:2208.09700 [hep-ex]. It was replaced with the published version. All the figures and tables can be found at: https://cms-results.web.cern.ch/cms-results/public-results/publications/B2G-21-004 (CMS Public Pages).Copyright © 2023 The Author(s). The first search is presented for vector-like leptons (VLLs) in the context of the “4321 model”, an ultraviolet-complete model with the potential to explain existing B physics measurements that are in tension with standard model predictions. The analyzed data, corresponding to an integrated luminosity of 96.5fb−1, were recorded in 2017 and 2018 with the CMS detector at the LHC in proton-proton collisions at √ s = 13 TeV. Final states with ≥3 b -tagged jets and two third-generation leptons (ττ, τντ, or ντντ) are considered. Upper limits are derived on the VLL production cross section in the VLL mass range 500–1050 GeV. The maximum likelihood fit prefers the presence of signal at the level of 2.8 standard deviations, for a representative VLL mass point of 600 GeV. As a consequence, the observed upper limits are approximately double the expected limits.SCOAP3
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