Search for resonance-enhanced <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math> and angular asymmetries in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi mathvariant="normal">Λ</mml:mi><mml:mi>c</mml:mi><mml:mo>+</mml:mo></mml:msubsup><mml:mo stretchy="false">→</mml:mo><mml:mi>p</mml:mi><mml:msup><mml:mi>μ</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>μ</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math> decay at LHCb


Aaij, R ORCID: 0000-0003-0533-1952, Abdelmotteleb, ASW ORCID: 0000-0001-7905-0542, Abellan Beteta, C ORCID: 0009-0009-0869-6798, Abudinén, F ORCID: 0000-0002-6737-3528, Ackernley, T ORCID: 0000-0002-5951-3498, Adefisoye, AA ORCID: 0000-0003-2448-1550, Adeva, B ORCID: 0000-0001-9756-3712, Adinolfi, M ORCID: 0000-0002-1326-1264, Adlarson, P ORCID: 0000-0001-6280-3851, Agapopoulou, C ORCID: 0000-0002-2368-0147 et al (show 1141 more authors) (2025) Search for resonance-enhanced <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math> and angular asymmetries in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi mathvariant="normal">Λ</mml:mi><mml:mi>c</mml:mi><mml:mo>+</mml:mo></mml:msubsup><mml:mo stretchy="false">→</mml:mo><mml:mi>p</mml:mi><mml:msup><mml:mi>μ</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>μ</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math> decay at LHCb. Physical Review D, 111 (9). l091102-. ISSN 2470-0010, 2470-0029

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Abstract

<jats:p>The first measurement of the <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>C</a:mi><a:mi>P</a:mi></a:math> asymmetry of the decay rate (<c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msub><c:mi>A</c:mi><c:mrow><c:mi>C</c:mi><c:mi>P</c:mi></c:mrow></c:msub></c:math>) and the <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:mi>C</e:mi><e:mi>P</e:mi></e:math> average (<g:math xmlns:g="http://www.w3.org/1998/Math/MathML" display="inline"><g:mi mathvariant="normal">Σ</g:mi><g:msub><g:mi>A</g:mi><g:mi>FB</g:mi></g:msub></g:math>) and <j:math xmlns:j="http://www.w3.org/1998/Math/MathML" display="inline"><j:mi>C</j:mi><j:mi>P</j:mi></j:math> asymmetry (<l:math xmlns:l="http://www.w3.org/1998/Math/MathML" display="inline"><l:mi mathvariant="normal">Δ</l:mi><l:msub><l:mi>A</l:mi><l:mi>FB</l:mi></l:msub></l:math>) of the forward-backward asymmetry in the muon system of <o:math xmlns:o="http://www.w3.org/1998/Math/MathML" display="inline"><o:msubsup><o:mi mathvariant="normal">Λ</o:mi><o:mi>c</o:mi><o:mo>+</o:mo></o:msubsup><o:mo stretchy="false">→</o:mo><o:mi>p</o:mi><o:msup><o:mi>μ</o:mi><o:mo>+</o:mo></o:msup><o:msup><o:mi>μ</o:mi><o:mo>−</o:mo></o:msup></o:math> decays is reported. The measurement is performed using a data sample of proton-proton collisions, recorded by the LHCb experiment from 2016 to 2018 at a center-of-mass energy of 13 TeV, which corresponds to an integrated luminosity of <s:math xmlns:s="http://www.w3.org/1998/Math/MathML" display="inline"><s:mn>5.4</s:mn><s:mtext> </s:mtext><s:mtext> </s:mtext><s:msup><s:mi>fb</s:mi><s:mrow><s:mo>−</s:mo><s:mn>1</s:mn></s:mrow></s:msup></s:math>. The asymmetries are measured in two regions of dimuon mass near the <u:math xmlns:u="http://www.w3.org/1998/Math/MathML" display="inline"><u:mi>ϕ</u:mi></u:math>-meson mass peak. The dimuon-mass integrated results are <w:math xmlns:w="http://www.w3.org/1998/Math/MathML" display="inline"><w:msub><w:mi>A</w:mi><w:mrow><w:mi>C</w:mi><w:mi>P</w:mi></w:mrow></w:msub><w:mo>=</w:mo><w:mo stretchy="false">(</w:mo><w:mo>−</w:mo><w:mn>1.1</w:mn><w:mo>±</w:mo><w:mn>4.0</w:mn><w:mo>±</w:mo><w:mn>0.5</w:mn><w:mo stretchy="false">)</w:mo><w:mo>%</w:mo></w:math>, <ab:math xmlns:ab="http://www.w3.org/1998/Math/MathML" display="inline"><ab:mi mathvariant="normal">Σ</ab:mi><ab:msub><ab:mi>A</ab:mi><ab:mi>FB</ab:mi></ab:msub><ab:mo>=</ab:mo><ab:mo stretchy="false">(</ab:mo><ab:mn>3.9</ab:mn><ab:mo>±</ab:mo><ab:mn>4.0</ab:mn><ab:mo>±</ab:mo><ab:mn>0.6</ab:mn><ab:mo stretchy="false">)</ab:mo><ab:mo>%</ab:mo></ab:math>, <fb:math xmlns:fb="http://www.w3.org/1998/Math/MathML" display="inline"><fb:mi mathvariant="normal">Δ</fb:mi><fb:msub><fb:mi>A</fb:mi><fb:mi>FB</fb:mi></fb:msub><fb:mo>=</fb:mo><fb:mo stretchy="false">(</fb:mo><fb:mn>3.1</fb:mn><fb:mo>±</fb:mo><fb:mn>4.0</fb:mn><fb:mo>±</fb:mo><fb:mn>0.4</fb:mn><fb:mo stretchy="false">)</fb:mo><fb:mo>%</fb:mo></fb:math>, where the first uncertainty is statistical and the second systematic. The results are consistent with the conservation of <kb:math xmlns:kb="http://www.w3.org/1998/Math/MathML" display="inline"><kb:mi>C</kb:mi><kb:mi>P</kb:mi></kb:math> symmetry and the Standard Model expectations.</jats:p>

Item Type: Article
Uncontrolled Keywords: 4902 Mathematical Physics, 49 Mathematical Sciences, 51 Physical Sciences
Divisions: Faculty of Humanities and Social Sciences
Faculty of Science and Engineering
Faculty of Science and Engineering > School of Engineering
Faculty of Science and Engineering > School of Physical Sciences
Faculty of Humanities and Social Sciences > School of the Arts
Depositing User: Symplectic Admin
Date Deposited: 09 Jun 2025 10:10
Last Modified: 07 Aug 2025 15:29
DOI: 10.1103/physrevd.111.l091102
Open Access URL: https://journals.aps.org/prd/pdf/10.1103/PhysRevD....
Related Websites:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3193121
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