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  2. Free, publicly-accessible full text available September 1, 2025
  3. 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
  4. 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
  5. The ALICE Collaboration reports measurements of the semi-inclusive distribution of charged-particle jets recoiling from a high transverse momentum (highpT) charged hadron, inppand central Pb-Pb collisions at center-of-mass energy per nucleon–nucleon collisionsNN=5.02TeV. The large uncorrelated background in central Pb-Pb collisions is corrected using a data-driven statistical approach which enables precise measurement of recoil jet distributions over a broad range inpT,chjetand jet resolution parameterR. Recoil jet yields are reported forR=0.2, 0.4, and 0.5 in the range7<pT,chjet<140 GeV/candπ/2<Δφ<π, whereΔφis the azimuthal angular separation between hadron trigger and recoil jet. The low-pT,chjetreach of the measurement explores unique phase space for studying jet quenching, the interaction of jets with the quark–gluon plasma generated in high-energy nuclear collisions. Comparison ofpT,chjetdistributions fromppand central Pb-Pb collisions probes medium-induced jet energy loss and intra-jet broadening, while comparison of their acoplanarity distributions explores in-medium jet scattering and medium response. The measurements are compared to theoretical calculations incorporating jet quenching.

    <supplementary-material><permissions><copyright-statement>©2024 CERN, for the ALICE 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 July 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/10554971-observation-medium-induced-yield-enhancement-acoplanarity-broadening-low-pt-jets-from-measurements-pp-central-pb-pb-collisions-snn" itemprop="url"> <span class='span-link' itemprop="name">Observation of Medium-Induced Yield Enhancement and Acoplanarity Broadening of Low- pT Jets from Measurements in pp and Central Pb-Pb Collisions at sNN=5.02  TeV</span> </a> </div> <div> <strong> <a class="misc external-link" href="https://doi.org/10.1103/PhysRevLett.133.022301" target="_blank" title="Link to document DOI">https://doi.org/10.1103/PhysRevLett.133.022301  <span class="fas fa-external-link-alt"></span></a> </strong> </div> <div class="metadata"> <span class="authors"> <span class="author" itemprop="author">Acharya, S</span> <span class="sep">; </span><span class="author" itemprop="author">Adamová, D</span> <span class="sep">; </span><span class="author" itemprop="author">Aglieri_Rinella, G</span> <span class="sep">; </span><span class="author" itemprop="author">Agnello, M</span> <span class="sep">; </span><span class="author" itemprop="author">Agrawal, N</span> <span class="sep">; </span><span class="author" itemprop="author">Ahammed, Z</span> <span class="sep">; </span><span class="author" itemprop="author">Ahmad, S</span> <span class="sep">; </span><span class="author" itemprop="author">Ahn, S U</span> <span class="sep">; </span><span class="author" itemprop="author">Ahuja, I</span> <span class="sep">; </span><span class="author" itemprop="author">Akindinov, A</span> <span class="sep">; </span><span class="author">et al</span></span> <span class="year">( <time itemprop="datePublished" datetime="2024-07-01">July 2024</time> , Physical Review Letters) </span> </div> <div style="cursor: pointer;-webkit-line-clamp: 5;" class="abstract" itemprop="description"> <p>The ALICE Collaboration reports the measurement of semi-inclusive distributions of charged-particle jets recoiling from a high transverse momentum (high<math display='inline'><mrow><msub><mrow><mi>p</mi></mrow><mrow><mi mathvariant='normal'>T</mi></mrow></msub></mrow></math>) hadron trigger in proton-proton and central Pb-Pb collisions at<math display='inline'><mrow><msqrt><mrow><msub><mrow><mi>s</mi></mrow><mrow><mi>NN</mi></mrow></msub></mrow></msqrt><mo>=</mo><mn>5.02</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></mrow></math>. A data-driven statistical method is used to mitigate the large uncorrelated background in central Pb-Pb collisions. Recoil jet distributions are reported for jet resolution parameter<math display='inline'><mi>R</mi><mo>=</mo><mn>0.2</mn></math>, 0.4, and 0.5 in the range<math display='inline'><mrow><mn>7</mn><mo><</mo><msub><mrow><mi>p</mi></mrow><mrow><mi mathvariant='normal'>T</mi><mo>,</mo><mtext>jet</mtext></mrow></msub><mo><</mo><mn>140</mn><mtext> </mtext><mtext> </mtext><mi>GeV</mi><mo>/</mo><mi>c</mi></mrow></math>and trigger-recoil jet azimuthal separation<math display='inline'><mrow><mi>π</mi><mo>/</mo><mn>2</mn><mo><</mo><mrow><mi mathvariant='normal'>Δ</mi><mi>φ</mi></mrow><mo><</mo><mi>π</mi></mrow></math>. The measurements exhibit a marked medium-induced jet yield enhancement at low<math display='inline'><msub><mi>p</mi><mi mathvariant='normal'>T</mi></msub></math>and at large azimuthal deviation from<math display='inline'><mrow><mrow><mi mathvariant='normal'>Δ</mi><mi>φ</mi></mrow><mo>∼</mo><mi>π</mi></mrow></math>. The enhancement is characterized by its dependence on<math display='inline'><mi mathvariant='normal'>Δ</mi><mi>φ</mi></math>, which has a slope that differs from zero by<math display='inline'><mrow><mn>4.7</mn><mi>σ</mi></mrow></math>. Comparisons to model calculations incorporating different formulations of jet quenching are reported. These comparisons indicate that the observed yield enhancement arises from the response of the QGP medium to jet propagation.</p> <sec><title/><supplementary-material><permissions><copyright-statement>© 2024 CERN, for the ALICE 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 July 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/10529547-search-_s-decay" itemprop="url"> <span class='span-link' itemprop="name">Search for the $$ {B}_s^0 $$ → μ+μ−γ decay</span> </a> </div> <div> <strong> <a class="misc external-link" href="https://doi.org/10.1007/JHEP07(2024)101" target="_blank" title="Link to document DOI">https://doi.org/10.1007/JHEP07(2024)101  <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">Adefisoye, A A</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">et al</span></span> <span class="year">( <time itemprop="datePublished" datetime="2024-07-01">July 2024</time> , Journal of High Energy Physics) </span> </div> <div style="cursor: pointer;-webkit-line-clamp: 5;" class="abstract" itemprop="description"> <title>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
  6. Free, publicly-accessible full text available June 1, 2025
  7. Measurements of thepT-dependent flow vector fluctuations in Pb–Pb collisions atsNN=5.02TeVusing azimuthal correlations with the ALICE experiment at the Large Hadron Collider are presented. A four-particle correlation approach [ALICE Collaboration, ] is used to quantify the effects of flow angle and magnitude fluctuations separately. This paper extends previous studies to additional centrality intervals and provides measurements of thepT-dependent flow vector fluctuations atsNN=5.02TeVwith two-particle correlations. SignificantpT-dependent fluctuations of theV2flow vector in Pb–Pb collisions are found across different centrality ranges, with the largest fluctuations of up to15%being present in the 5% most central collisions. In parallel, no evidence of significantpT-dependent fluctuations ofV3orV4is found. Additionally, evidence of flow angle and magnitude fluctuations is observed with more than5σsignificance in central collisions. These observations inPb–Pbcollisions indicate where the classical picture of hydrodynamic modeling with a common symmetry plane breaks down. This has implications for hard probes at highpT, which might be biased bypT-dependent flow angle fluctuations of at least 23% in central collisions. Given the presented results, existing theoretical models should be reexamined to improve our understanding of initial conditions, quark–gluon plasma properties, and the dynamic evolution of the created system.

    <supplementary-material><permissions><copyright-statement>©2024 CERN, for the ALICE 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/10514230-photoproduction-k+k-pairs-ultraperipheral-collisions" itemprop="url"> <span class='span-link' itemprop="name">Photoproduction of K+K− Pairs in Ultraperipheral Collisions</span> </a> </div> <div> <strong> <a class="misc external-link" href="https://doi.org/10.1103/PhysRevLett.132.222303" target="_blank" title="Link to document DOI">https://doi.org/10.1103/PhysRevLett.132.222303  <span class="fas fa-external-link-alt"></span></a> </strong> </div> <div class="metadata"> <span class="authors"> <span class="author" itemprop="author">Acharya, S</span> <span class="sep">; </span><span class="author" itemprop="author">Adamová, D</span> <span class="sep">; </span><span class="author" itemprop="author">Aglieri_Rinella, G</span> <span class="sep">; </span><span class="author" itemprop="author">Agnello, M</span> <span class="sep">; </span><span class="author" itemprop="author">Agrawal, N</span> <span class="sep">; </span><span class="author" itemprop="author">Ahammed, Z</span> <span class="sep">; </span><span class="author" itemprop="author">Ahmad, S</span> <span class="sep">; </span><span class="author" itemprop="author">Ahn, S U</span> <span class="sep">; </span><span class="author" itemprop="author">Ahuja, I</span> <span class="sep">; </span><span class="author" itemprop="author">Akindinov, A</span> <span class="sep">; </span><span class="author">et al</span></span> <span class="year">( <time itemprop="datePublished" datetime="2024-05-01">May 2024</time> , Physical Review Letters) </span> </div> <div style="cursor: pointer;-webkit-line-clamp: 5;" class="abstract" itemprop="description"> <p><math display='inline'><msup><mi>K</mi><mo>+</mo></msup><msup><mi>K</mi><mo>−</mo></msup></math>pairs may be produced in photonuclear collisions, either from the decays of photoproduced<math display='inline'><mi>ϕ</mi><mo stretchy='false'>(</mo><mn>1020</mn><mo stretchy='false'>)</mo></math>mesons or directly as nonresonant<math display='inline'><msup><mi>K</mi><mo>+</mo></msup><msup><mi>K</mi><mo>−</mo></msup></math>pairs. Measurements of<math display='inline'><msup><mi>K</mi><mo>+</mo></msup><msup><mi>K</mi><mo>−</mo></msup></math>photoproduction probe the couplings between the<math display='inline'><mi>ϕ</mi><mo stretchy='false'>(</mo><mn>1020</mn><mo stretchy='false'>)</mo></math>and charged kaons with photons and nuclear targets. The kaon-proton scattering occurs at energies far above those available elsewhere. We present the first measurement of coherent photoproduction of<math display='inline'><msup><mi>K</mi><mo>+</mo></msup><msup><mi>K</mi><mo>−</mo></msup></math>pairs on lead ions in ultraperipheral collisions using the ALICE detector, including the first investigation of direct<math display='inline'><msup><mi>K</mi><mo>+</mo></msup><msup><mi>K</mi><mo>−</mo></msup></math>production. There is significant<math display='inline'><msup><mi>K</mi><mo>+</mo></msup><msup><mi>K</mi><mo>−</mo></msup></math>production at low transverse momentum, consistent with coherent photoproduction on lead targets. In the mass range<math display='inline'><mrow><mn>1.1</mn><mo><</mo><msub><mrow><mi>M</mi></mrow><mrow><mi>K</mi><mi>K</mi></mrow></msub><mo><</mo><mn>1.4</mn><mtext> </mtext><mtext> </mtext><mi>GeV</mi><mo>/</mo><msup><mrow><mi>c</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math>above the<math display='inline'><mi>ϕ</mi><mo stretchy='false'>(</mo><mn>1020</mn><mo stretchy='false'>)</mo></math>resonance, for rapidity<math display='inline'><mrow><mo stretchy='false'>|</mo><msub><mrow><mi>y</mi></mrow><mrow><mi>K</mi><mi>K</mi></mrow></msub><mo stretchy='false'>|</mo><mo><</mo><mn>0.8</mn></mrow></math>and<math display='inline'><msub><mi>p</mi><mrow><mi>T</mi><mo>,</mo><mi>K</mi><mi>K</mi></mrow></msub><mo><</mo><mn>0.1</mn><mtext> </mtext><mtext> </mtext><mi>GeV</mi><mo>/</mo><mi>c</mi></math>, the measured coherent photoproduction cross section is<math display='inline'><mrow><mi mathvariant='normal'>d</mi><mi>σ</mi><mo>/</mo><mi mathvariant='normal'>d</mi><mi>y</mi><mo>=</mo><mn>3.37</mn><mo>±</mo><mn>0.61</mn><mo stretchy='false'>(</mo><mtext>stat</mtext><mo stretchy='false'>)</mo><mo>±</mo><mn>0.15</mn><mo stretchy='false'>(</mo><mi>syst</mi><mo stretchy='false'>)</mo><mtext> </mtext><mtext> </mtext><mi>mb</mi></mrow></math>. The center-of-mass energy per nucleon of the photon-nucleus (Pb) system<math display='inline'><mrow><msub><mrow><mi>W</mi></mrow><mrow><mi>γ</mi><mi>Pb</mi><mo>,</mo><mi>n</mi></mrow></msub></mrow></math>ranges from 33 to 188 GeV, far higher than previous measurements on heavy-nucleus targets. The cross section is larger than expected for<math display='inline'><mi>ϕ</mi><mo stretchy='false'>(</mo><mn>1020</mn><mo stretchy='false'>)</mo></math>photoproduction alone. The mass spectrum is fit to a cocktail consisting of<math display='inline'><mi>ϕ</mi><mo stretchy='false'>(</mo><mn>1020</mn><mo stretchy='false'>)</mo></math>decays, direct<math display='inline'><msup><mi>K</mi><mo>+</mo></msup><msup><mi>K</mi><mo>−</mo></msup></math>photoproduction, and interference between the two. The confidence regions for the amplitude and relative phase angle for direct<math display='inline'><msup><mi>K</mi><mo>+</mo></msup><msup><mi>K</mi><mo>−</mo></msup></math>photoproduction are presented.</p> <sec><supplementary-material><permissions><copyright-statement>© 2024 CERN, for the ALICE 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 May 1, 2025</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">28</span></label></div> <div> <table> <tr> <td valign="top"> <input id="pagination-sel-sptag-2" data-range="" value="1" min="1" max="28" name="pagination-sel" type="range" class="pagination-sel noborderradius" style="height:26px;padding:0px;margin-right:5px; 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