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Journal articleHayrapetyan A, Tumasyan A, Adam W, et al., 2025,
Measurement of the inclusive tt¯ cross section in final states with at least one lepton and additional jets with 302 pb−1 of pp collisions at s = 5.02 TeV
, Journal of High Energy Physics, Vol: 2025A measurement of the top quark pair (tt¯) production cross section in proton-proton collisions at a centre-of-mass energy of 5.02 TeV is presented. The data were collected at the LHC in autumn 2017, in dedicated runs with low-energy and low-intensity conditions with respect to the default configuration, and correspond to an integrated luminosity of 302 pb<sup>−1</sup>. The measurement is performed using events with one electron or muon, and multiple jets, at least one of them being identified as originating from a b quark (b tagged). Events are classified based on the number of all reconstructed jets and of b-tagged jets. Multivariate analysis techniques are used to enhance the separation between the signal and backgrounds. The measured cross section is 62.5±1.6stat−2.5+2.6syst±1.2lumi pb. A combination with the result in the dilepton channel based on the same data set yields a value of 62.3 ± 1.5 (stat) ± 2.4 (syst) ± 1.2 (lumi) pb, to be compared with the standard model prediction of 69.5−3.7+3.5 pb at next-to-next-to-leading order in perturbative quantum chromodynamics.
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Journal articleAalbers J, Abe K, Adrover M, et al., 2025,
Neutrinoless double beta decay sensitivity of the XLZD rare event observatory
, Journal of Physics G: Nuclear and Particle Physics, Vol: 52, ISSN: 0954-3899The XLZD collaboration is developing a two-phase xenon time projection chamber with an active mass of 60–80 t capable of probing the remaining weakly interacting massive particle-nucleon interaction parameter space down to the so-called neutrino fog. In this work we show that, based on the performance of currently operating detectors using the same technology and a realistic reduction of radioactivity in detector materials, such an experiment will also be able to competitively search for neutrinoless double beta decay in 136Xe using a natural-abundance xenon target. XLZD can reach a 3σ discovery potential half-life of 5.7 × 1027 years (and a 90% CL exclusion of 1.3 × 1028 years) with 10 years of data taking, corresponding to a Majorana mass range of 7.3–31.3 meV (4.8–20.5 meV). XLZD will thus exclude the inverted neutrino mass ordering parameter space and will start to probe the normal ordering region for most of the nuclear matrix elements commonly considered by the community.
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Journal articleZwalinski L, Zou W, Zormpa O, et al., 2025,
Measurement of the Lund jet plane in hadronic decays of top quarks and W bosons with the ATLAS detector
, European Physical Journal C, Vol: 85, ISSN: 1434-6044The Lund jet plane (LJP) is measured for the first time in tt¯ events, using 140 fb-1 of s=13 TeV pp collision data collected with the ATLAS detector at the LHC. The LJP is a two-dimensional observable of the sub-structure of hadronic jets that acts as a proxy for the kinematics of parton showers and hadron formation. The observable is constructed from charged particles and is measured for R=1.0 anti-kt jets with transverse momentum above 350 GeV containing the full decay products of either a top quark or a daughter W boson. The other top quark in the event is identified from its decay into a b-quark, an electron or a muon and a neutrino. The measurement is corrected for detector effects and compared with a range of Monte Carlo predictions sensitive to different aspects of the hadronic decays of the heavy particles. In the W-boson-initiated jets, all the predictions are incompatible with the measurement. In the top quark initiated jets, disagreement with all predictions is observed in smaller subregions of the plane, and with a subset of the predictions across the fiducial plane. The measurement could be used to improve the tuning of Monte Carlo generators, for better modelling of hadronic decays of heavy quarks and bosons, or to improve the performance of jet taggers.
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Journal article, 2025,
Review of searches for vector-like quarks, vector-like leptons, and heavy neutral leptons in proton–proton collisions at √s=13 TeV at the CMS experiment
, Physics Reports, Vol: 1115, Pages: 570-677, ISSN: 0370-1573 -
Journal article, 2025,
Review of top quark mass measurements in CMS
, Physics Reports, Vol: 1115, Pages: 116-218, ISSN: 0370-1573 -
Journal article, 2025,
Enriching the physics program of the CMS experiment via data scouting and data parking
, Physics Reports, Vol: 1115, Pages: 678-772, ISSN: 0370-1573 -
Journal article, 2025,
Searches for Higgs boson production through decays of heavy resonances
, Physics Reports, Vol: 1115, Pages: 368-447, ISSN: 0370-1573 -
Journal article, 2025,
Dark sector searches with the CMS experiment
, Physics Reports, Vol: 1115, Pages: 448-569, ISSN: 0370-1573 -
Journal articleChekhovsky V, Hayrapetyan A, Makarenko V, et al., 2025,
Identification of low-momentum muons in the CMS detector using multivariate techniques in proton-proton collisions at √<i>s</i>=13.6 TeV
, JOURNAL OF INSTRUMENTATION, Vol: 20 -
Journal articleHayrapetyan A, Tumasyan A, Adam W, et al., 2025,
Proton reconstruction with the TOTEM Roman pot detectors for high-β* LHC data
, JOURNAL OF INSTRUMENTATION, Vol: 20 -
Journal articleHayrapetyan A, Tumasyan A, Adam W, et al., 2025,
Measurement of the inclusive cross sections for W and Z boson production in proton-proton collisions at √<i>s</i>=5.02 and 13 TeV
, JOURNAL OF HIGH ENERGY PHYSICS- Cite
- Citations: 2
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Journal article, 2025,
Stairway to discovery: A report on the CMS programme of cross section measurements from millibarns to femtobarns
, Physics Reports, Vol: 1115, Pages: 3-115, ISSN: 0370-1573 -
Journal articleAad G, Aakvaag E, Abbott B, et al., 2025,
Search for Dark Matter Produced in Association with a Dark Higgs Boson in the bb[over ¯] Final State Using pp Collisions at sqrt[s]=13 TeV with the ATLAS Detector.
, Phys Rev Lett, Vol: 134A search is performed for dark matter particles produced in association with a resonantly produced pair of b-quarks with 30<m_{bb}<150 GeV using 140 fb^{-1} of proton-proton collisions at a center-of-mass energy of 13 TeV recorded by the ATLAS detector at the LHC. This signature is expected in extensions of the standard model predicting the production of dark matter particles, in particular those containing a dark Higgs boson s that decays into bb[over ¯]. The highly boosted s→bb[over ¯] topology is reconstructed using jet reclustering and a new identification algorithm. This search places stringent constraints across regions of the dark Higgs model parameter space that satisfy the observed relic density, excluding dark Higgs bosons with masses between 30 and 150 GeV in benchmark scenarios with Z^{'} mediator masses up to 4.8 TeV at 95% confidence level.
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Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2025,
Test of Lepton Flavor Universality with <i>B<sub>s</sub></i><SUP>0</SUP> → φ<i>l</i><SUP>+</SUP> <i>l</i><SUP>-</SUP> Decays
, PHYSICAL REVIEW LETTERS, Vol: 134, ISSN: 0031-9007 -
Journal articleHayrapetyan A, Tumasyan A, Adam W, et al., 2025,
Search for pair production of heavy particles decaying to a top quark and a gluon in the lepton plus jets final state in proton-proton collisions at √<i>s</i>=13 TeV
, EUROPEAN PHYSICAL JOURNAL C, Vol: 85, ISSN: 1434-6044 -
Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2025,
Measurement of CP asymmetry in B<sub>s</sub><SUP>0</SUP> → D<sub>s</sub><SUP>∓</SUP> K<SUP>±</SUP> decays
, JOURNAL OF HIGH ENERGY PHYSICS- Cite
- Citations: 1
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Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2025,
Measurement of φ(1020) meson production in fixed-target <i>p</i> Ne collisions at √<i>s<sub>NN</sub></i>=68.5 GeV
, JOURNAL OF HIGH ENERGY PHYSICS -
Journal articleAaij R, Abdelmotteleb ASW, Abellan Beteta C, et al., 2025,
Search for charge-parity violation in semileptonically tagged <i>D</i><SUP>0</SUP> → <i>K</i><SUP>+</SUP> π<SUP>-</SUP> decays
, JOURNAL OF HIGH ENERGY PHYSICS- Cite
- Citations: 2
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Journal articleHayrapetyan A, Tumasyan A, Adam W, et al., 2025,
Search for Nuclear Modifications of <i>B</i><SUP>+</SUP> Meson Production in <i>p</i>-Pb Collisions at √<i>s</i><sub>NN</sub>=8.16 TeV
, PHYSICAL REVIEW LETTERS, Vol: 134, ISSN: 0031-9007 -
Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2025,
Long-lived particle reconstruction downstream of the LHCb magnet (vol 85, 7, 2025)
, EUROPEAN PHYSICAL JOURNAL C, Vol: 85, ISSN: 1434-6044 -
Journal articleAhmed A, Bhattacharya A, Das I, 2025,
Anomalous and large topological Hall effects in <i>β</i>-Mn chiral compound Co<sub>6.5</sub>Ru<sub>1.5</sub>Zn<sub>8</sub>Mn<sub>4</sub>: electron electron interaction facilitated quantum interference effect
, JOURNAL OF PHYSICS-CONDENSED MATTER, Vol: 37, ISSN: 0953-8984 -
Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2025,
Study of Λ<sub>b</sub><SUP>0</SUP> and Ξ<sub>b</sub><SUP>0</SUP> Decays to Λh<SUP>+</SUP> h'<SUP>-</SUP> - and Evidence for CP Violation in Λ<sub>b</sub><SUP>0</SUP> → ΛK<SUP>+</SUP> K<SUP>-</SUP> Decays
, PHYSICAL REVIEW LETTERS, Vol: 134, ISSN: 0031-9007- Cite
- Citations: 5
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Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2025,
First Evidence for Direct <i>CP</i> Violation in Beauty to Charmonium Decays
, PHYSICAL REVIEW LETTERS, Vol: 134, ISSN: 0031-9007- Cite
- Citations: 2
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Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2025,
Observation of the Open-Charm Tetraquark Candidate <i>Tcs</i>0*(2870)<SUP>0</SUP> in the <i>B</i><SUP>-</SUP> → <i>D</i><SUP>-</SUP> <i>D</i><SUP>0</SUP><i>K<sub>S</sub></i><SUP>0</SUP> Decay
, PHYSICAL REVIEW LETTERS, Vol: 134, ISSN: 0031-9007 -
Journal articleThielemann F, Siemund J, von Schoenfeld D, et al., 2025,
Exploring Atom-Ion Feshbach Resonances below the s-Wave Limit
, PHYSICAL REVIEW X, Vol: 15, ISSN: 2160-3308- Cite
- Citations: 4
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Journal articleHayrapetyan A, Tumasyan A, Adam W, et al., 2025,
Test of lepton flavor universality in semileptonic (Formula presented) meson decays in proton-proton collisions at (Formula presented)
, Physical Review D, Vol: 111, ISSN: 2470-0010A measurement of the ratio of branching fractions (Formula presented) in the (Formula presented), (Formula presented) decay channel is presented. This measurement uses a sample of proton-proton collision data collected at a center-of-mass energy of (Formula presented) by the CMS experiment in 2018, corresponding to an integrated luminosity of (Formula presented). The measured ratio, (Formula presented), agrees with the value of (Formula presented) predicted by the standard model, which assumes lepton flavor universality. By testing lepton flavor universality, this measurement is a probe of new physics using (Formula presented) mesons, which are currently only produced at the LHC.
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Journal articleAcero MA, Acharya B, Adamson P, et al., 2025,
Measurement of d2σ/d
, Physical Review D, Vol: 111, ISSN: 2470-0010Double- and single-differential cross sections for inclusive charged-current νμ-nucleus scattering are reported for the kinematic domain 0 to 2 GeV/c in three-momentum transfer and 0 to 2 GeV in available energy, at a mean νμ energy of 1.86 GeV. The measurements are based on an estimated 995,760 νμ charged-current (CC) interactions in the scintillator medium of the NOvA Near Detector. The subdomain populated by 2-particle-2-hole (2p2h) reactions is identified by the cross section excess relative to predictions for νμ-nucleus scattering that are constrained by a data control sample. Models for 2-particle-2-hole processes are rated by χ2 comparisons of the predicted-versus-measured νμ CC inclusive cross section over the full phase space and in the restricted subdomain. Shortfalls are observed in neutrino generator predictions obtained using the theory-based València and SuSAv2 2p2h models.
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Journal articleZwalinski L, Zou W, Zormpa O, et al., 2025,
Search for light neutral particles decaying promptly into collimated pairs of electrons or muons in pp collisions at s = 13 TeV with the ATLAS detector
, European Physical Journal C, Vol: 85, ISSN: 1434-6044A search for a dark photon, a new light neutral particle, which decays promptly into collimated pairs of electrons or muons is presented. The search targets dark photons resulting from the exotic decay of the Standard Model Higgs boson, assuming its production via the dominant gluon-gluon fusion mode. The analysis is based on 140fb-1 of data collected with the ATLAS detector at the Large Hadron Collider from proton-proton collisions at a center-of-mass energy of 13 TeV. Events with collimated pairs of electrons or muons are analysed and background contributions are estimated using data-driven techniques. No significant excess in the data above the Standard Model background is observed. Upper limits are set at 95% confidence level on the branching ratio of the Higgs boson decay into dark photons between 0.001% and 5%, depending on the assumed dark photon mass and signal model.
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Journal articleGallagher J, Grant CM, Green MJ, et al., 2025,
Measurement of photonuclear jet production in ultraperipheral (Formula presented) collisions at (Formula presented) with the ATLAS detector
, Physical Review D, Vol: 111, ISSN: 2470-0010In ultrarelativistic heavy ion collisions at the LHC, each nucleus acts a sources of high-energy real photons that can scatter off the opposing nucleus in ultraperipheral photonuclear ((Formula presented)) collisions. Hard scattering processes initiated by the photons in such collisions provide a novel method for probing nuclear parton distributions in a kinematic region not easily accessible to other measurements. ATLAS has measured production of dijet and multijet final states in ultraperipheral (Formula presented) collisions at (Formula presented) using a dataset recorded in 2018 with an integrated luminosity of (Formula presented). Photonuclear final states are selected by requiring a rapidity gap in the photon direction; this selects events where one of the outgoing nuclei remains intact. Jets are reconstructed using the anti-(Formula presented) algorithm with radius parameter, (Formula presented). Triple-differential cross sections, unfolded for detector response, are measured and presented using two sets of kinematic variables. The first set consists of the total transverse momentum ((Formula presented)), rapidity, and mass of the jet system. The second set uses (Formula presented) and particle-level nuclear and photon parton momentum fractions, (Formula presented) and (Formula presented), respectively. The results are compared with leading-order perturbative QCD calculations of photonuclear jet production cross sections, where all leading order predictions using existing fits fall below the data in the shadowing region. More detailed theoretical comparisons will allow these results to strongly constrain nuclear parton distributions, and these data provide results from the LHC directly comparable to early physics results at the planned Electron-Ion Collider.
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Journal articleChekhovsky V, Hayrapetyan A, Makarenko V, et al., 2025,
Constraints on standard model effective field theory for a Higgs boson produced in association with W or Z bosons in the H →bb¯ decay channel in proton-proton collisions at s = 13 TeV
, Journal of High Energy Physics, Vol: 2025A standard model effective field theory (SMEFT) analysis with dimension-six operators probing nonresonant new physics effects is performed in the Higgs-strahlung process, where the Higgs boson is produced in association with a W or Z boson, in proton-proton collisions at a center-of-mass energy of 13 TeV. The final states in which the W or Z boson decays leptonically and the Higgs boson decays to a pair of bottom quarks are considered. The analyzed data were collected by the CMS experiment between 2016 and 2018 and correspond to an integrated luminosity of 138 fb<sup>−1</sup>. An approach designed to simultaneously optimize the sensitivity to Wilson coefficients of multiple SMEFT operators is employed. Likelihood scans as functions of the Wilson coefficients that carry SMEFT sensitivity in this final state are performed for different expansions in SMEFT. The results are consistent with the predictions of the standard model.
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