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  1. A<sc>bstract</sc>

    A comprehensive study of the local and nonlocal amplitudes contributing to the decayB0K*0(→K+π)μ+μis performed by analysing the phase-space distribution of the decay products. The analysis is based onppcollision data corresponding to an integrated luminosity of 8.4 fb1collected by the LHCb experiment. This measurement employs for the first time a model of both one-particle and two-particle nonlocal amplitudes, and utilises the complete dimuon mass spectrum without any veto regions around the narrow charmonium resonances. In this way it is possible to explicitly isolate the local and nonlocal contributions and capture the interference between them. The results show that interference with nonlocal contributions, although larger than predicted, only has a minor impact on the Wilson Coefficients determined from the fit to the data. For the local contributions, the Wilson Coefficient$$ {\mathcal{C}}_9 $$C9, responsible for vector dimuon currents, exhibits a 2.1σdeviation from the Standard Model expectation. The Wilson Coefficients$$ {\mathcal{C}}_{10} $$C10,$$ {\mathcal{C}}_9^{\prime } $$C9and$$ {\mathcal{C}}_{10}^{\prime } $$C10are all in better agreement than$$ {\mathcal{C}}_9 $$C9with the Standard Model and the global significance is at the level of 1.5σ. The model used also accounts for nonlocal contributions fromB0→ K*0[τ+τ→ μ+μ] rescattering, resulting in the first direct measurement of thebsττvector effective-coupling$$ {\mathcal{C}}_{9\tau } $$C9τ.

     
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    Free, publicly-accessible full text available September 1, 2025
  2. A search for hidden-charm pentaquark states decaying to a range ofΣcD¯andΛc+D¯final states, as well as doubly charmed pentaquark states toΣcDandΛc+D, is made using samples of proton-proton collision data corresponding to an integrated luminosity of5.7fb1recorded by the LHCb detector ats=13TeV. Since no significant signals are found, upper limits are set on the pentaquark yields relative to that of theΛc+baryon in theΛc+pKπ+decay mode. The known pentaquark states are also investigated, and their signal yields are found to be consistent with zero in all cases.

    © 2024 CERN, for the LHCb Collaboration2024CERN 
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    Free, publicly-accessible full text available August 1, 2025
  3. A<sc>bstract</sc>

    A search for the fully reconstructed$$ {B}_s^0 $$Bs0→ μ+μγdecay is performed at the LHCb experiment using proton-proton collisions at$$ \sqrt{s} $$s= 13 TeV corresponding to an integrated luminosity of 5.4 fb1. No significant signal is found and upper limits on the branching fraction in intervals of the dimuon mass are set$$ {\displaystyle \begin{array}{cc}\mathcal{B}\left({B}_s^0\to {\mu}^{+}{\mu}^{-}\gamma \right)<4.2\times {10}^{-8},& m\left({\mu}^{+}{\mu}^{-}\right)\in \left[2{m}_{\mu },1.70\right]\textrm{GeV}/{c}^2,\\ {}\mathcal{B}\left({B}_s^0\to {\mu}^{+}{\mu}^{-}\gamma \right)<7.7\times {10}^{-8},&\ m\left({\mu}^{+}{\mu}^{-}\right)\in \left[\textrm{1.70,2.88}\right]\textrm{GeV}/{c}^2,\\ {}\mathcal{B}\left({B}_s^0\to {\mu}^{+}{\mu}^{-}\gamma \right)<4.2\times {10}^{-8},& m\left({\mu}^{+}{\mu}^{-}\right)\in \left[3.92,{m}_{B_s^0}\right]\textrm{GeV}/{c}^2,\end{array}} $$BBs0μ+μγ<4.2×108,mμ+μ2mμ1.70GeV/c2,BBs0μ+μγ<7.7×108,mμ+μ1.70, 2.88GeV/c2,BBs0μ+μγ<4.2×108,mμ+μ3.92mBs0GeV/c2,

    at 95% confidence level. Additionally, upper limits are set on the branching fraction in the [2mμ,1.70] GeV/c2dimuon mass region excluding the contribution from the intermediateϕ(1020) meson, and in the region combining all dimuon-mass intervals.

     
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    Free, publicly-accessible full text available July 1, 2025
  4. The LHCb upgrade represents a major change of the experiment. The detectors have been almost completely renewed to allow running at an instantaneous luminosity five times larger than that of the previous running periods. Readout of all detectors into an all-software trigger is central to the new design, facilitating the reconstruction of events at the maximum LHC interaction rate, and their selection in real time. The experiment's tracking system has been completely upgraded with a new pixel vertex detector, a silicon tracker upstream of the dipole magnet and three scintillating fibre tracking stations downstream of the magnet. The whole photon detection system of the RICH detectors has been renewed and the readout electronics of the calorimeter and muon systems have been fully overhauled. The first stage of the all-software trigger is implemented on a GPU farm. The output of the trigger provides a combination of totally reconstructed physics objects, such as tracks and vertices, ready for final analysis, and of entire events which need further offline reprocessing. This scheme required a complete revision of the computing model and rewriting of the experiment's software. 
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    Free, publicly-accessible full text available May 1, 2025
  5. A search for high-mass resonances decaying into aτ-lepton and a neutrino using proton-proton collisions at a center-of-mass energy ofs=13TeVis presented. The full run 2 data sample corresponding to an integrated luminosity of139fb1recorded by the ATLAS experiment in the years 2015–2018 is analyzed. Theτ-lepton is reconstructed in its hadronic decay modes and the total transverse momentum carried out by neutrinos is inferred from the reconstructed missing transverse momentum. The search for new physics is performed on the transverse mass between theτ-lepton and the missing transverse momentum. No excess of events above the Standard Model expectation is observed and upper exclusion limits are set on theWτνproduction cross section. HeavyWvector bosons with masses up to 5.0 TeV are excluded at 95% confidence level, assuming that they have the same couplings as the Standard ModelWboson. For nonuniversal couplings,Wbosons are excluded for masses less than 3.5–5.0 TeV, depending on the model parameters. In addition, model-independent limits on the visible cross section times branching ratio are determined as a function of the lower threshold on the transverse mass of theτ-lepton and missing transverse momentum.

    <supplementary-material><permissions><copyright-statement>© 2024 CERN, for the ATLAS Collaboration</copyright-statement><copyright-year>2024</copyright-year><copyright-holder>CERN</copyright-holder></permissions></supplementary-material></sec> </div> <a href='#' class='show open-abstract' style='margin-left:10px;'>more »</a> <a href='#' class='hide close-abstract' style='margin-left:10px;'>« less</a> <div class="actions" style="padding-left:10px;"> <span class="reader-count"> Free, publicly-accessible full text available June 1, 2025</span> </div> </div><div class="clearfix"></div> </div> </li> <li> <div class="article item document" itemscope itemtype="http://schema.org/TechArticle"> <div class="item-info"> <div class="title"> <a href="https://par.nsf.gov/biblio/10527971-production-mesons-pp-ppb-collisions" itemprop="url"> <span class='span-link' itemprop="name">Production of η and η′ mesons in pp and pPb collisions</span> </a> </div> <div> <strong> <a class="misc external-link" href="https://doi.org/10.1103/PhysRevC.109.024907" target="_blank" title="Link to document DOI">https://doi.org/10.1103/PhysRevC.109.024907  <span class="fas fa-external-link-alt"></span></a> </strong> </div> <div class="metadata"> <span class="authors"> <span class="author" itemprop="author">Aaij, R</span> <span class="sep">; </span><span class="author" itemprop="author">Abdelmotteleb, A_S W</span> <span class="sep">; </span><span class="author" itemprop="author">Abellan_Beteta, C</span> <span class="sep">; </span><span class="author" itemprop="author">Abudinén, F</span> <span class="sep">; </span><span class="author" itemprop="author">Ackernley, T</span> <span class="sep">; </span><span class="author" itemprop="author">Adeva, B</span> <span class="sep">; </span><span class="author" itemprop="author">Adinolfi, M</span> <span class="sep">; </span><span class="author" itemprop="author">Adlarson, P</span> <span class="sep">; </span><span class="author" itemprop="author">Agapopoulou, C</span> <span class="sep">; </span><span class="author" itemprop="author">Aidala, C A</span> <span class="sep">; </span><span class="author">et al</span></span> <span class="year">( <time itemprop="datePublished" datetime="2024-02-01">February 2024</time> , Physical Review C) </span> </div> <div style="cursor: pointer;-webkit-line-clamp: 5;" class="abstract" itemprop="description"> The production of 𝜂 and 𝜂′ mesons is studied in proton-proton and proton-lead collisions collected with the LHCb detector. Proton-proton collisions are studied at center-of-mass energies of 5.02 and 13TeV and proton-lead collisions are studied at a center-of-mass energy per nucleon of 8.16TeV. The studies are performed in center-of-mass (c.m.) rapidity regions 2.5<𝑦c.m.<3.5 (forward rapidity) and −4.0<𝑦c.m.<−3.0 (backward rapidity) defined relative to the proton beam direction. The 𝜂 and 𝜂′ production cross sections are measured differentially as a function of transverse momentum for 1.5<𝑝T<10GeV and 3<𝑝T<10GeV, respectively. The differential cross sections are used to calculate nuclear modification factors. The nuclear modification factors for 𝜂 and 𝜂′ mesons agree at both forward and backward rapidity, showing no significant evidence of mass dependence. The differential cross sections of 𝜂 mesons are also used to calculate 𝜂/𝜋0 cross-section ratios, which show evidence of a deviation from the world average. These studies offer new constraints on mass-dependent nuclear effects in heavy-ion collisions, as well as 𝜂 and 𝜂′ meson fragmentation. </div> <a href='#' class='show open-abstract' style='margin-left:10px;'>more »</a> <a href='#' class='hide close-abstract' style='margin-left:10px;'>« less</a> <div class="actions" style="padding-left:10px;"> <span class="reader-count"> Free, publicly-accessible full text available February 1, 2025</span> </div> </div><div class="clearfix"></div> </div> </li> <li> <div class="article item document" itemscope itemtype="http://schema.org/TechArticle"> <div class="item-info"> <div class="title"> <a href="https://par.nsf.gov/biblio/10516590-measurement-ratios-branching-fractions-d0" itemprop="url"> <span class='span-link' itemprop="name">Measurement of the Ratios of Branching Fractions R(D*) and R(D0)</span> </a> </div> <div> <strong> <a class="misc external-link" href="https://doi.org/10.1103/PhysRevLett.131.111802" target="_blank" title="Link to document DOI">https://doi.org/10.1103/PhysRevLett.131.111802  <span class="fas fa-external-link-alt"></span></a> </strong> </div> <div class="metadata"> <span class="authors"> <span class="author" itemprop="author">Aaij, R</span> <span class="sep">; </span><span class="author" itemprop="author">Abdelmotteleb, A_S W</span> <span class="sep">; </span><span class="author" itemprop="author">Abellan_Beteta, C</span> <span class="sep">; </span><span class="author" itemprop="author">Abudinén, F</span> <span class="sep">; </span><span class="author" itemprop="author">Ackernley, T</span> <span class="sep">; </span><span class="author" itemprop="author">Adeva, B</span> <span class="sep">; </span><span class="author" itemprop="author">Adinolfi, M</span> <span class="sep">; </span><span class="author" itemprop="author">Adlarson, P</span> <span class="sep">; </span><span class="author" itemprop="author">Afsharnia, H</span> <span class="sep">; </span><span class="author" itemprop="author">Agapopoulou, C</span> <span class="sep">; </span><span class="author">et al</span></span> <span class="year">( <time itemprop="datePublished" datetime="2023-09-01">September 2023</time> , Physical Review Letters) </span> </div> <span class="editors"> <span class="editor" itemprop="editor">Garisto, R</span> (Ed.) </span> <div style="cursor: pointer;-webkit-line-clamp: 5;" class="abstract" itemprop="description"> The ratios of branching fractions R(D*)= B(B0 --> D*+tau- nu(bar))/ B(B0--> D*+mu- nu(bar)) and R(D)= B(B0 --> D0tau- nu(bar))/ B(B0 --> D0mu- nu(bar)) are measured, assuming isospin symmetry, using a sample of proton-proton collision data corresponding to 3.0 fb−1 of integrated luminosity recorded by the LHCb experiment during 2011 and 2012. The tau lepton is identified in the decay mode τ− → μ−ντν¯μ. The measured values are R*D*)= 0.281+/- 0.018+/- 0.024 and R(D0)=0.441+/- 0.060+/- 0.066, where the first uncertainty is statistical and the second is systematic. The correlation between these measurements is ρ= −0.43. The results are consistent with the current average of these quantities and are at a combined 1.9 standard deviations from the predictions based on lepton flavor universality in the standard model </div> <a href='#' class='show open-abstract' style='margin-left:10px;'>more »</a> <a href='#' class='hide close-abstract' style='margin-left:10px;'>« less</a> <div class="actions" style="padding-left:10px;"> <span class="reader-count"> <a class="misc external-link" href="https://doi.org/10.1103/PhysRevLett.131.111802" target="_blank" title="Link to document DOI" data-ostiid="10516590"> Full Text Available <span class="fas fa-external-link-alt"></span> </a> </span> </div> </div><div class="clearfix"></div> </div> </li> <li> <div class="article item document" itemscope itemtype="http://schema.org/TechArticle"> <div class="item-info"> <div class="title"> <a href="https://par.nsf.gov/biblio/10463533-measurement-prompt-d0-nuclear-modification-factor-ppb-collisions-snn" itemprop="url"> <span class='span-link' itemprop="name">Measurement of the Prompt D0 Nuclear Modification Factor in p−Pb Collisions at sNN=8.16  TeV</span> </a> </div> <div> <strong> <a class="misc external-link" href="https://doi.org/10.1103/PhysRevLett.131.102301" target="_blank" title="Link to document DOI">https://doi.org/10.1103/PhysRevLett.131.102301  <span class="fas fa-external-link-alt"></span></a> </strong> </div> <div class="metadata"> <span class="authors"> <span class="author" itemprop="author">Aaij, R.</span> <span class="sep">; </span><span class="author" itemprop="author">Abdelmotteleb, A. S. W.</span> <span class="sep">; </span><span class="author" itemprop="author">Abellan Beteta, C.</span> <span class="sep">; </span><span class="author" itemprop="author">Abudinén, F.</span> <span class="sep">; </span><span class="author" itemprop="author">Ackernley, T.</span> <span class="sep">; </span><span class="author" itemprop="author">Adeva, B.</span> <span class="sep">; </span><span class="author" itemprop="author">Adinolfi, M.</span> <span class="sep">; </span><span class="author" itemprop="author">Afsharnia, H.</span> <span class="sep">; </span><span class="author" itemprop="author">Agapopoulou, C.</span> <span class="sep">; </span><span class="author" itemprop="author">Aidala, C. A.</span> <span class="sep">; </span><span class="author">et al</span></span> <span class="year">( <time itemprop="datePublished" datetime="2023-09-01">September 2023</time> , Physical Review Letters) </span> </div> <div class="actions" style="padding-left:10px;"> <span class="reader-count"> <a class="misc external-link" href="https://doi.org/10.1103/PhysRevLett.131.102301" target="_blank" title="Link to document DOI" data-ostiid="10463533"> Full Text Available <span class="fas fa-external-link-alt"></span> </a> </span> </div> </div><div class="clearfix"></div> </div> </li> <li> <div class="article item document" itemscope itemtype="http://schema.org/TechArticle"> <div class="item-info"> <div class="title"> <a href="https://par.nsf.gov/biblio/10466060-measurement-branching-fractions-b0pppp-bs0pppp" itemprop="url"> <span class='span-link' itemprop="name">Measurement of the Branching Fractions B(B0→pp¯pp¯) and B(Bs0→pp¯pp¯)</span> </a> </div> <div> <strong> <a class="misc external-link" href="https://doi.org/10.1103/PhysRevLett.131.091901" target="_blank" title="Link to document DOI">https://doi.org/10.1103/PhysRevLett.131.091901  <span class="fas fa-external-link-alt"></span></a> </strong> </div> <div class="metadata"> <span class="authors"> <span class="author" itemprop="author">Aaij, R.</span> <span class="sep">; </span><span class="author" itemprop="author">Abdelmotteleb, A. S. W.</span> <span class="sep">; </span><span class="author" itemprop="author">Abellan Beteta, C.</span> <span class="sep">; </span><span class="author" itemprop="author">Abudinén, F.</span> <span class="sep">; </span><span class="author" itemprop="author">Ackernley, T.</span> <span class="sep">; </span><span class="author" itemprop="author">Adeva, B.</span> <span class="sep">; </span><span class="author" itemprop="author">Adinolfi, M.</span> <span class="sep">; </span><span class="author" itemprop="author">Adlarson, P.</span> <span class="sep">; </span><span class="author" itemprop="author">Afsharnia, H.</span> <span class="sep">; </span><span class="author" itemprop="author">Agapopoulou, C.</span> <span class="sep">; </span><span class="author">et al</span></span> <span class="year">( <time itemprop="datePublished" datetime="2023-08-01">August 2023</time> , Physical Review Letters) </span> </div> <div class="actions" style="padding-left:10px;"> <span class="reader-count"> <a class="misc external-link" href="https://doi.org/10.1103/PhysRevLett.131.091901" target="_blank" title="Link to document DOI" data-ostiid="10466060"> Full Text Available <span class="fas fa-external-link-alt"></span> </a> </span> </div> </div><div class="clearfix"></div> </div> </li> <li> <div class="article item document" itemscope itemtype="http://schema.org/TechArticle"> <div class="item-info"> <div class="title"> <a href="https://par.nsf.gov/biblio/10463535-multidifferential-study-identified-charged-hadron-distributions-tagged-jets-proton-proton-collisions" itemprop="url"> <span class='span-link' itemprop="name">Multidifferential study of identified charged hadron distributions in Z -tagged jets in proton-proton collisions at s=13  TeV</span> </a> </div> <div> <strong> <a class="misc external-link" href="https://doi.org/10.1103/PhysRevD.108.L031103" target="_blank" title="Link to document DOI">https://doi.org/10.1103/PhysRevD.108.L031103  <span class="fas fa-external-link-alt"></span></a> </strong> </div> <div class="metadata"> <span class="authors"> <span class="author" itemprop="author">Aaij, R.</span> <span class="sep">; </span><span class="author" itemprop="author">Abdelmotteleb, A. S. W.</span> <span class="sep">; </span><span class="author" itemprop="author">Abellan Beteta, C.</span> <span class="sep">; </span><span class="author" itemprop="author">Abudinén, F.</span> <span class="sep">; </span><span class="author" itemprop="author">Ackernley, T.</span> <span class="sep">; </span><span class="author" itemprop="author">Adeva, B.</span> <span class="sep">; </span><span class="author" itemprop="author">Adinolfi, M.</span> <span class="sep">; </span><span class="author" itemprop="author">Afsharnia, H.</span> <span class="sep">; </span><span class="author" itemprop="author">Agapopoulou, C.</span> <span class="sep">; </span><span class="author" itemprop="author">Aidala, C. A.</span> <span class="sep">; </span><span class="author">et al</span></span> <span class="year">( <time itemprop="datePublished" datetime="2023-08-01">August 2023</time> , Physical Review D) </span> </div> <div class="actions" style="padding-left:10px;"> <span class="reader-count"> <a class="misc external-link" href="https://doi.org/10.1103/PhysRevD.108.L031103" target="_blank" title="Link to document DOI" data-ostiid="10463535"> Full Text Available <span class="fas fa-external-link-alt"></span> </a> </span> </div> </div><div class="clearfix"></div> </div> </li> </ol> <div id="pagination-lower" style=""> <div class="pull-right" style="line-height: 30px;"> <div class="btn-group pagination nomargin"> <a href="#" class="btn btn-sm btn-default noborderradius" disabled="disabled">«<span class="hidden-xs"> Prev</span></a> <a class="dropdown-toggle btn btn-sm btn-default paging-dropdown hidden-xs noborderradius" href="#" data-toggle="dropdown"><span class="caret"></span><span class="sr-only">Select page number</span></a> <div class="dropdown-menu pull-right paging-slider-dropdown" style="padding: 15px;"> <small> <div class="text-muted" style="line-height:20px;"><label for="pagination-sel-sptag-2">Go to page: <span class="paging-target">1</span> of <span class="paging-max">12</span></label></div> <div> <table> <tr> <td valign="top"> <input id="pagination-sel-sptag-2" data-range="" value="1" min="1" max="12" name="pagination-sel" type="range" class="pagination-sel noborderradius" style="height:26px;padding:0px;margin-right:5px; 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