View in EDS

Observation of γγ→ττ in proton–proton collisions and limits on the anomalous electromagnetic moments of the τ lepton.

Saved in:
Bibliographic Details
Title: Observation of γγ→ττ in proton–proton collisions and limits on the anomalous electromagnetic moments of the τ lepton.
Authors: CMS Collaboration, The1 (AUTHOR) cms-publication-committee-chair@cern.ch
Source: Reports on Progress in Physics. Oct2024, Vol. 87 Issue 10, p1-21. 21p.
Subjects: Electric dipole moments, Standard model (Nuclear physics), Magnetic moments, Standard deviations, Data recorders & recording, Proton-proton interactions
Abstract: The production of a pair of τ leptons via photon–photon fusion, γ γ → τ τ , is observed for the first time in proton–proton collisions, with a significance of 5.3 standard deviations. This observation is based on a data set recorded with the CMS detector at the LHC at a center-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 138 fb−1. Events with a pair of τ leptons produced via photon–photon fusion are selected by requiring them to be back-to-back in the azimuthal direction and to have a minimum number of charged hadrons associated with their production vertex. The τ leptons are reconstructed in their leptonic and hadronic decay modes. The measured fiducial cross section of γ γ → τ τ is σ obs fid = 12.4 − 3.1 + 3.8 fb . Constraints are set on the contributions to the anomalous magnetic moment ( a τ ) and electric dipole moments ( d τ ) of the τ lepton originating from potential effects of new physics on the γ τ τ vertex: a τ = 0.0009 − 0.0031 + 0.0032 and | d τ | < 2.9 × 10 − 17 e cm (95% confidence level), consistent with the standard model. [ABSTRACT FROM AUTHOR]
Copyright of Reports on Progress in Physics is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
FullText Text:
  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 179436857
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Observation of γγ→ττ in proton–proton collisions and limits on the anomalous electromagnetic moments of the τ lepton.
– Name: Author
  Label: Authors
  Group: Au
  Data: &lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22CMS+Collaboration%2C+The%22&quot;&gt;CMS Collaboration, The&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;i&gt; cms-publication-committee-chair@cern.ch&lt;/i&gt;
– Name: TitleSource
  Label: Source
  Group: Src
  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Reports+on+Progress+in+Physics%22&quot;&gt;Reports on Progress in Physics&lt;/searchLink&gt;. Oct2024, Vol. 87 Issue 10, p1-21. 21p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: &lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Electric+dipole+moments%22&quot;&gt;Electric dipole moments&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Standard+model+%28Nuclear+physics%29%22&quot;&gt;Standard model (Nuclear physics)&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Magnetic+moments%22&quot;&gt;Magnetic moments&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Standard+deviations%22&quot;&gt;Standard deviations&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Data+recorders+%26+recording%22&quot;&gt;Data recorders &amp; recording&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Proton-proton+interactions%22&quot;&gt;Proton-proton interactions&lt;/searchLink&gt;
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The production of a pair of τ leptons via photon–photon fusion, γ γ → τ τ , is observed for the first time in proton–proton collisions, with a significance of 5.3 standard deviations. This observation is based on a data set recorded with the CMS detector at the LHC at a center-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 138 fb−1. Events with a pair of τ leptons produced via photon–photon fusion are selected by requiring them to be back-to-back in the azimuthal direction and to have a minimum number of charged hadrons associated with their production vertex. The τ leptons are reconstructed in their leptonic and hadronic decay modes. The measured fiducial cross section of γ γ → τ τ is σ obs fid = 12.4 − 3.1 + 3.8 fb . Constraints are set on the contributions to the anomalous magnetic moment ( a τ ) and electric dipole moments ( d τ ) of the τ lepton originating from potential effects of new physics on the γ τ τ vertex: a τ = 0.0009 − 0.0031 + 0.0032 and | d τ | &lt; 2.9 &#215; 10 − 17 e cm (95% confidence level), consistent with the standard model. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: &lt;i&gt;Copyright of Reports on Progress in Physics is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=179436857
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1088/1361-6633/ad6fcb
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 21
        StartPage: 1
    Subjects:
      – SubjectFull: Electric dipole moments
        Type: general
      – SubjectFull: Standard model (Nuclear physics)
        Type: general
      – SubjectFull: Magnetic moments
        Type: general
      – SubjectFull: Standard deviations
        Type: general
      – SubjectFull: Data recorders & recording
        Type: general
      – SubjectFull: Proton-proton interactions
        Type: general
    Titles:
      – TitleFull: Observation of γγ→ττ in proton–proton collisions and limits on the anomalous electromagnetic moments of the τ lepton.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: CMS Collaboration, The
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 10
              Text: Oct2024
              Type: published
              Y: 2024
          Identifiers:
            – Type: issn-print
              Value: 00344885
          Numbering:
            – Type: volume
              Value: 87
            – Type: issue
              Value: 10
          Titles:
            – TitleFull: Reports on Progress in Physics
              Type: main
ResultId 1