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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: 20The TOTEM Roman pot detectors are used to reconstruct the transverse momentum of scattered protons and to estimate the transverse location of the primary interaction. This paper presents new methods of track reconstruction, measurements of strip-level detection efficiencies, cross-checks of the LHC beam optics, and detector alignment techniques, along with their application in the selection of signal collision events. The track reconstruction is performed by exploiting hit cluster information through a novel method using a common polygonal area in the intercept-slope plane. The technique is applied in the relative alignment of detector layers with μm precision. A tag-and-probe method is used to extract strip-level detection efficiencies. The alignment of the Roman pot system is performed through time-dependent adjustments, resulting in a position accuracy of 3 μm in the horizontal and 60 μm in the vertical directions. The goal is to provide an optimal reconstruction tool for central exclusive physics analyses based on the high-β<sup>∗</sup> data-taking period at √s = 13 TeV in 2018.
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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 √s = 13.6 TeV
, Journal of Instrumentation, Vol: 20"Soft"muons with a transverse momentum below 10 GeV are featured in many processes studied by the CMS experiment, such as decays of heavy-flavor hadrons or rare tau lepton decays. Maximizing the selection efficiency for these muons, while simultaneously suppressing backgrounds from long-lived light-flavor hadron decays, is therefore important for the success of the CMS physics program. Multivariate techniques have been shown to deliver better muon identification performance than traditional selection techniques. To take full advantage of the large data set currently being collected during Run 3 of the CERN LHC, a new multivariate classifier based on a gradient-boosted decision tree has been developed. It offers a significantly improved separation of signal and background muons compared to a similar classifier used for the analysis of the Run 2 data. The performance of the new classifier is evaluated on a data set collected with the CMS detector in 2022 and 2023, corresponding to an integrated luminosity of 62 fb<sup>-1</sup>
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Journal articleSchueler J, Araújo HM, Balashov SN, et al., 2025,
Transforming a rare event search into a not-so-rare event search in real-time with deep learning-based object detection
, Physical Review D, Vol: 111, ISSN: 2470-0010Deep learning-based object detection algorithms enable the simultaneous classification and localization of any number of objects in image data. Many of these algorithms are capable of operating in real-time on high resolution images, attributing to their widespread usage across many fields. We present an end-to-end object detection pipeline designed for rare event searches for the Migdal effect, at real-time speeds, using high-resolution image data from the scientific CMOS camera readout of the MIGDAL experiment. The Migdal effect in nuclear scattering, critical for sub-GeV dark matter searches, has yet to be experimentally confirmed, making its detection a primary goal of the MIGDAL experiment. The Migdal effect forms a composite rare event signal topology consisting of an electronic and nuclear recoil sharing the same vertex. Crucially, both recoil species are commonly observed in isolation in the MIGDAL experiment, enabling us to train YOLOv8, a state-of-the-art object detection algorithm, on real data. Topologies indicative of the Migdal effect can then be identified in science data via pairs of neighboring or overlapping electron and nuclear recoils. Applying selections to real data that retain 99.7% signal acceptance in simulations, we demonstrate our pipeline to reduce a sample of 20 million recorded images to fewer than 1000 frames, thereby transforming a rare search into a much more manageable search. More broadly, we discuss the applicability of using object detection to enable data-driven machine learning training for other rare event search applications such as neutrinoless double beta decay searches and experiments imaging exotic nuclear decays.
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Journal articleHayrapetyan A, Tumasyan A, Adam W, et al., 2025,
Energy-scaling behavior of intrinsic transverse-momentum parameters in Drell-Yan simulation
, Physical Review D, Vol: 111, ISSN: 2470-0010An analysis is presented based on models of the intrinsic transverse momentum (intrinsic (Formula presented)) of partons in nucleons by studying the dilepton transverse momentum in Drell-Yan events. Using parameter tuning in event generators and existing data from fixed-target experiments and from hadron colliders, our investigation spans 3 orders of magnitude in center-of-mass energy and 2 orders of magnitude in dilepton invariant mass. The results show an energy-scaling behavior of the intrinsic (Formula presented) parameters, independent of the dilepton invariant mass at a given center-of-mass energy.
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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 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,
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 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,
Overview of high-density QCD studies with the CMS experiment at the LHC
, Physics Reports, Vol: 1115, Pages: 219-367, ISSN: 0370-1573 -
Journal articleAaij R, Abdelmotteleb ASW, Abellan Beteta C, et al., 2025,
Test of Lepton Flavor Universality with B_{s}^{0}→ϕℓ^{+}ℓ^{-} Decays.
, Phys Rev Lett, Vol: 134Lepton flavor universality in rare b→s transitions is tested for the first time using B_{s}^{0} meson decays. The measurements are performed using pp collision data collected by the LHCb experiment between 2011 and 2018, corresponding to a total integrated luminosity of 9 fb^{-1}. Branching fraction ratios between the B_{s}^{0}→ϕe^{+}e^{-} and B_{s}^{0}→ϕμ^{+}μ^{-} decays are measured in three regions of dilepton mass squared, q^{2}, with 0.1<q^{2}<1.1, 1.1<q^{2}<6.0, and 15<q^{2}<19 GeV^{2}/c^{4}. The results agree with the standard model expectation of lepton flavor universality.
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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+jets final state in proton–proton collisions at $$\sqrt{s}=13\,\text {Te}\hspace{-.08em}\text {V} $$
, The European Physical Journal C, Vol: 85<jats:title>Abstract</jats:title> <jats:p>A search is presented for the pair production of new heavy resonances, each decaying into a top quark (t) or antiquark and a gluon (g). The analysis uses data recorded with the CMS detector from proton–proton collisions at a center-of-mass energy of 13<jats:inline-formula> <jats:alternatives> <jats:tex-math>$$\,\text {Te}\hspace{-.08em}\text {V}$$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mspace/> <mml:mtext>Te</mml:mtext> <mml:mspace/> <mml:mtext>V</mml:mtext> </mml:mrow> </mml:math> </jats:alternatives> </jats:inline-formula> at the LHC, corresponding to an integrated luminosity of 138<jats:inline-formula> <jats:alternatives> <jats:tex-math>$$\,\text {fb}^{-1}$$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mspace/> <mml:msup> <mml:mtext>fb</mml:mtext> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:mrow> </mml:math> </jats:alternatives> </jats:inline-formula>. Events with one muon or electron, multiple jets, and missing transverse momentum are selected. After using a deep neural network to enrich the data sample with signal-like events, distributions in the scalar su
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Journal articleHayrapetyan A, Tumasyan A, Adam W, et al., 2025,
Search for Nuclear Modifications of B^{+} Meson Production in p-Pb Collisions at sqrt[s_{NN}]=8.16 TeV.
, Phys Rev Lett, Vol: 134Nuclear medium effects on B^{+} meson production are studied using the binary-collision scaled cross section ratio between events of different charged-particle multiplicities from proton-lead collisions. Data, collected by the CMS experiment in 2016 at a nucleon-nucleon center-of-mass energy of sqrt[s_{NN}]=8.16 TeV, corresponding to an integrated luminosity of 175 nb^{-1}, were used. The scaling factors in the ratio are determined using a novel approach based on the Z→μ^{-}μ^{+} cross sections measured in the same events. The scaled ratio for B^{+} is consistent with unity for all event multiplicities, putting stringent constraints on nuclear modification for heavy flavor.
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Journal articleAaij R, Abdelmotteleb ASW, Abellan Beteta C, et al., 2025,
Observation of the Open-Charm Tetraquark Candidate T_{cs0}^{*}(2870)^{0} in the B^{-}→D^{-}D^{0}K_{S}^{0} Decay.
, Phys Rev Lett, Vol: 134An amplitude analysis of B^{-}→D^{-}D^{0}K_{S}^{0} decays is performed using proton-proton collision data, corresponding to an integrated luminosity of 9 fb^{-1}, collected with the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV. A resonant structure of spin-parity 0^{+} is observed in the D^{0}K_{S}^{0} invariant-mass spectrum with a significance of 5.3σ. The mass and width of the state, modeled with a Breit-Wigner line shape, are determined to be 2883±11±8 MeV/c^{2} and 87_{-47}^{+22}±17 MeV, respectively, where the first uncertainties are statistical and the second systematic. These properties and the quark content are consistent with those of the open-charm tetraquark candidate T_{cs0}^{*}(2870)^{0} observed previously in the D^{+}K^{-} final state of the B^{-}→D^{-}D^{+}K^{-} decay. This result confirms the existence of the T_{cs0}^{*}(2870)^{0} state in a new decay mode. The T_{cs1}^{*}(2900)^{0} state, reported in the B^{-}→D^{-}D^{+}K^{-} decay, is also searched for in the D^{0}K_{S}^{0} invariant-mass spectrum of the B^{-}→D^{-}D^{0}K_{S}^{0} decay, without finding evidence for it.
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Journal articleAaij R, Abdelmotteleb ASW, Abellan Beteta C, et al., 2025,
Study of Λ_{b}^{0} and Ξ_{b}^{0} Decays to Λh^{+}h^{'-} and Evidence for CP Violation in Λ_{b}^{0}→ΛK^{+}K^{-} Decays.
, Phys Rev Lett, Vol: 134A study of Λ_{b}^{0} and Ξ_{b}^{0} decays to Λh^{+}h^{'-} (h^{(')}=π,K) is performed using pp collision data collected by the LHCb experiment during LHC Runs 1-2, corresponding to an integrated luminosity of 9 fb^{-1}. The branching fractions for these decays are measured using the Λ_{b}^{0}→Λ_{c}^{+}(→Λπ^{+})π^{-} decay as a control channel. The decays Λ_{b}^{0}→Λπ^{+}π^{-} and Ξ_{b}^{0}→ΛK^{-}π^{+} are observed for the first time. For decay modes with sufficient signal yields, CP asymmetries are measured in the full and localized regions of the final-state phase space. Evidence is found for CP violation in the Λ_{b}^{0}→ΛK^{+}K^{-} decay, interpreted as originating primarily from an asymmetric Λ_{b}^{0}→N^{*+}K^{-} decay amplitude. The measured CP asymmetries for other decays are compatible with zero.
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Journal articleAaij R, Abdelmotteleb ASW, Abellan Beteta C, et al., 2025,
First Evidence for Direct CP Violation in Beauty to Charmonium Decays.
, Phys Rev Lett, Vol: 134The CP asymmetry and branching fraction of the Cabibbo-Kobayashi-Maskawa-suppressed decay B^{+}→J/ψπ^{+} are precisely measured relative to the favored decay B^{+}→J/ψK^{+} using a sample of proton-proton collision data corresponding to an integrated luminosity of 5.4 fb^{-1} recorded at a center-of-mass energy of 13 TeV during 2016-2018. The results of the CP asymmetry difference and branching fraction ratio are ΔA^{CP}≡A^{CP}(B^{+}→J/ψπ^{+})-A^{CP}(B^{+}→J/ψK^{+})=(1.29±0.49±0.08)×10^{-2}, R_{π/K}≡[B(B^{+}→J/ψπ^{+})/B(B^{+}→J/ψK^{+})]=(3.852±0.022±0.018)×10^{-2}, where the first uncertainties are statistical and the second are systematic. A combination with previous LHCb results based on data collected at 7 and 8 TeV in 2011 and 2012 yields ΔA^{CP}=(1.42±0.43±0.08)×10^{-2} and R_{π/K}=(3.846±0.018±0.018)×10^{-2}. The combined ΔA^{CP} value deviates from zero by 3.2 standard deviations, providing the first evidence for direct CP violation in the amplitudes of beauty decays to charmonium final states.
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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 → $$ \textrm{b}\overline{\textrm{b}} $$ decay channel in proton-proton collisions at $$ \sqrt{s} $$ = 13 TeV
, Journal of High Energy Physics, Vol: 2025<jats:title>A<jats:sc>bstract</jats:sc> </jats:title> <jats:p>A 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<jats:sup> <jats:italic>−</jats:italic>1</jats: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.</jats:p>
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Journal articleAaij R, Abdelmotteleb ASW, Abellan Beteta C, et al., 2025,
Constraints on the photon polarisation in b → sγ transitions using Bs0→ ϕe+e− decays
, Journal of High Energy Physics, Vol: 2025An angular analysis of the Bs0→ ϕe<sup>+</sup>e<sup>−</sup> decay is performed using the proton-proton collision dataset collected between 2011 and 2018 by the LHCb experiment, corresponding to an integrated luminosity of 9 fb<sup>−1</sup> at centre-of-mass energies of 7, 8 and 13 TeV. The analysis is performed in the very low dielectron invariant mass-squared region between 0.0009 and 0.2615 GeV<sup>2</sup>/c<sup>4</sup>. The longitudinal polarisation fraction of the ϕ meson is measured to be less than 11.5% at 90% confidence level. The ATReCP observable, which is related to the lepton forward-backward asymmetry, is measured to be 0.116 ± 0.155 ± 0.006, where the first uncertainty is statistical and the second systematic. The transverse asymmetries, AT2 and ATImCP, which are sensitive to the virtual photon polarisation, are found to be −0.045 ± 0.235 ± 0.014 and 0.002 ± 0.247 ± 0.016, respectively. The results are consistent with Standard Model predictions.
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Journal articleFedi G, 2025,
Rare Decays in CMS †
, Particles, Vol: 8The CMS experiment at the LHC has advanced precision measurements of rare B-meson and charm decays, offering insights into phenomena beyond the Standard Model (SM). This paper highlights key results from Run 2 and Run 3 data, including the branching fraction and lifetime of (Formula presented.), angular analyses of (Formula presented.), the first observation of (Formula presented.), and stringent limits on (Formula presented.). These findings provide tests of SM predictions while probing subtle hints of new physics.
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Journal articleHayrapetyan A, Tumasyan A, Adam W, et al., 2025,
Search for the Higgs boson decays to a ρ0, ϕ, or K⁎0 meson and a photon in proton-proton collisions at s=13TeV
, Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, Vol: 862, ISSN: 0370-2693Three rare decay processes of the Higgs boson to a ρ(770)<sup>0</sup>, ϕ(1020), or K<sup>⁎</sup>(892)<sup>0</sup> meson and a photon are searched for using s=13TeV proton-proton collision data collected by the CMS experiment at the LHC. Events are selected assuming the mesons decay into a pair of charged pions, a pair of charged kaons, or a charged kaon and pion, respectively. Depending on the Higgs boson production mode, different triggering and reconstruction techniques are adopted. The analyzed data sets correspond to integrated luminosities up to 138fb<sup>−1</sup>, depending on the reconstructed final state. After combining various data sets and categories, no significant excess above the background expectations is observed. Upper limits at 95% confidence level on the Higgs boson branching fractions into ρ(770)<sup>0</sup>γ, ϕ(1020)γ, and K<sup>⁎</sup>(892)<sup>0</sup>γ are determined to be 3.7×10<sup>−4</sup>, 3.0×10<sup>−4</sup>, and 3.0×10<sup>−4</sup>, respectively. In case of the ρ(770)<sup>0</sup>γ and ϕ(1020)γ channels, these are the most stringent experimental limits to date.
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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 articleBhattacharya A, Ahmed A, Dutta A, et al., 2025,
Anomalous Hall effect in the polar magnet Gd3Ni8Sn4: A candidate for hosting skyrmions
, Physical Review B, Vol: 111, ISSN: 2469-9950While recent theoretical studies have positioned noncollinear polar magnets with Cnv symmetry as compelling candidates for realizing topological magnetic phases and substantial intrinsic anomalous Hall conductivity, experimental realizations of the same in strongly correlated systems remain rare. Here, we present a large intrinsic anomalous Hall effect and extended topological magnetic ordering in Gd3Ni8Sn4 with hexagonal C6v symmetry. Observation of topological Hall response, corroborated by metamagnetic anomalies in isothermal magnetization, peak/hump features in field-evolution of ac susceptibility and longitudinal resistivity suggest the signature of topological magnetic phases. The anomalous Hall effect is quantitatively accounted for by the intrinsic Berry curvature-mediated mechanism. Our results underscore polar magnets as a promising platform to investigate a plethora of emergent electrodynamic responses rooted in the interplay between magnetism and topology.
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Journal articleHayrapetyan A, Tumasyan A, Adam W, et al., 2025,
Search for light long-lived particles decaying to displaced jets in proton-proton collisions at √s = 13.6 TeV
, Reports on Progress in Physics, Vol: 88, ISSN: 0034-4885A search for light long-lived particles (LLPs) decaying to displaced jets is presented, using a data sample of proton-proton collisions at a center-of-mass energy of 13.6 TeV, corresponding to an integrated luminosity of 34.7 fb−1, collected with the CMS detector at the CERN LHC in 2022. Novel trigger, reconstruction, and machine-learning techniques were developed for and employed in this search. After all selections, the observations are consistent with the background predictions. Limits are presented on the branching fraction of the Higgs boson to LLPs that subsequently decay to quark pairs or tau lepton pairs. An improvement by up to a factor of 10 is achieved over previous limits for models with LLP masses smaller than 60 GeV and proper decay lengths smaller than 1 m. The first constraints are placed on the fraternal twin Higgs (FTH) and folded supersymmetry (FSUSY) models, where the lower bounds on the top quark partner mass reach up to 350 GeV for the FTH model and 250 GeV for the FSUSY model.
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Journal articleAaij R, Abdelmotteleb ASW, Abellan Beteta C, et al., 2025,
Search for charge-parity violation in semileptonically tagged D0→ K+π− decays
, Journal of High Energy Physics, Vol: 2025An analysis of the flavour oscillations of the charmed neutral meson is presented. The ratio of D<sup>0</sup> → K<sup>+</sup>π<sup>−</sup> and D<sup>0</sup> → K<sup>−</sup>π<sup>+</sup> decay rates is measured as a function of the decay time of the D<sup>0</sup> meson and compared with the charge-conjugated system to search for charge-parity violation. The meson flavour at production is double-tagged by the charges of the muon and pion in the preceding B¯→D∗2010+μ−X and D<sup>∗</sup>(2010)<sup>+</sup> → D<sup>0</sup>π<sup>+</sup> decays, respectively. These decays are selected from proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 5.4 fb<sup>−1</sup>. The flavour oscillation parameters, relating to the differences in mass and width of the mass eigenstates, are found to be y′ = (5.8 ± 1.6) × 10<sup>−3</sup> and (x′)<sup>2</sup> = (0.0 ± 1.2) × 10<sup>−4</sup>. No evidence for charge-parity violation is seen either in the flavour oscillations or in the decay, where the direct charge-parity asymmetry is measured to be A<inf>D</inf> = (2.3 ± 1.7) %.
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Journal articleAaij R, Abdelmotteleb ASW, Abellan Beteta C, et al., 2025,
First Determination of the Spin-Parity of Ξ_{c}(3055)^{+,0} Baryons.
, Phys Rev Lett, Vol: 134The Ξ_{b}^{0(-)}→Ξ_{c}(3055)^{+(0)}(→D^{+(0)}Λ)π^{-} decay chains are observed, and the spin-parity of Ξ_{c}(3055)^{+(0)} baryons is determined for the first time. The measurement is performed using proton-proton collision data at a center-of-mass energy of sqrt[s]=13 TeV, corresponding to an integrated luminosity of 5.4 fb^{-1}, recorded by the LHCb experiment between 2016 and 2018. The spin-parity of the Ξ_{c}(3055)^{+(0)} baryons is determined to be 3/2^{+} with a significance of more than 6.5σ (3.5σ) compared to all other tested hypotheses. The up-down asymmetries of the Ξ_{b}^{0(-)}→Ξ_{c}(3055)^{+(0)}π^{-} transitions are measured to be -0.92±0.10±0.05 (-0.92±0.16±0.22), consistent with maximal parity violation, where the first uncertainty is statistical and the second is systematic. These results support the hypothesis that the Ξ_{c}(3055)^{+(0)} baryons correspond to the first D-wave λ-mode excitation of the Ξ_{c} flavor triplet.
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Journal articleHayrapetyan A, Tumasyan A, Adam W, et al., 2025,
Bottom quark energy loss and hadronization with B+ and $$ {\textrm{B}}_{\textrm{s}}^0 $$ nuclear modification factors using pp and PbPb collisions at $$ \sqrt{s_{\textrm{NN}}} $$ = 5.02 TeV
, Journal of High Energy Physics, Vol: 2025<jats:title>A<jats:sc>bstract</jats:sc> </jats:title> <jats:p>The production cross sections of <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ {\textrm{B}}_{\textrm{s}}^0 $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>B</mml:mi> <mml:mi>s</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> </jats:alternatives> </jats:inline-formula> and B<jats:sup>+</jats:sup> mesons are reported in proton-proton (pp) collisions recorded by the CMS experiment at the CERN LHC with a center-of-mass energy of 5.02 TeV. The data sample corresponds to an integrated luminosity of 302 pb<jats:sup> <jats:italic>−</jats:italic>1</jats:sup>. The cross sections are based on measurements of the <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ {\textrm{B}}_{\textrm{s}}^0 $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>B</mml:mi> <mml:mi>s</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> </jats:alternatives> </jats:inline-formula> <jats:italic>→</jats:italic> J<jats:italic>/ψ</jats:italic>(<jats:italic>μ</jats:italic> <jats:sup>+</jats:sup> <jats:italic>μ</jats:italic> <jats:sup>
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Journal articleHayrapetyan A, Tumasyan A, Adam W, et al., 2025,
Search for high-mass resonances in a final state comprising a gluon and two hadronically decaying W bosons in proton-proton collisions at $$ \sqrt{s} $$ = 13 TeV
, Journal of High Energy Physics, Vol: 2025<jats:title>A<jats:sc>bstract</jats:sc> </jats:title> <jats:p>A search for high-mass resonances decaying into a gluon, g, and two W bosons is presented. A Kaluza-Klein gluon, g<jats:sub>KK</jats:sub>, decaying in cascade via a scalar radion R, g<jats:sub>KK</jats:sub> → gR → gWW, is considered. The final state studied consists of three large-radius jets, two of which contain the products of hadronically decaying W bosons, and the third one the hadronization products of the gluon. The analysis is performed using proton-proton collision data at <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ \sqrt{s} $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> </jats:alternatives> </jats:inline-formula> = 13 TeV collected by the CMS experiment at the CERN LHC during 2016–2018, corresponding to an integrated luminosity of 138 fb<jats:sup> <jats:italic>−</jats:italic>1</jats:sup>. The masses of the g<jats:sub>KK</jats:sub> and R candidates are reconstructed as trijet and dijet masses, respectively. These are used for event categorization and signal extraction. No excess of data events above the standard model background expectation is observed. Upper limits are set on the product of the g<jats:sub>KK</jats:sub> production cross section and its branching fraction via a radion R to gWW. This is the first analysis examining the resonant WW+jet signature and setting limits on the two resonance masses in an extended warped extra-dimensional model.</jats:p>
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Journal articleHayrapetyan A, Tumasyan A, Adam W, et al., 2025,
Measurements of inclusive and differential cross sections for top quark production in association with a Z boson in proton-proton collisions at $$ \sqrt{s} $$ = 13 TeV
, Journal of High Energy Physics, Vol: 2025<jats:title>A<jats:sc>bstract</jats:sc> </jats:title> <jats:p>Measurements are presented of inclusive and differential cross sections for Z boson associated production of top quark pairs (<jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ \textrm{t}\overline{\textrm{t}}\textrm{Z} $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mi>Z</mml:mi> </mml:math> </jats:alternatives> </jats:inline-formula>) and single top quarks (tZq or tWZ). The data were recorded in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 138 fb<jats:sup> <jats:italic>−</jats:italic>1</jats:sup>. Events with three or more leptons, electrons or muons, are selected and a multiclass deep neural network is used to separate three event categories, the <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ \textrm{t}\overline{\textrm{t}}\textrm{Z} $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mi>Z</mml:mi> </mml:math> </jats:alternatives> </jats:inline-formula> and tWZ processes, the tZq process, and the
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Journal articleArmano M, Audley H, Baird J, et al., 2025,
Magnetic-Induced Force Noise in LISA Pathfinder Free-Falling Test Masses.
, Phys Rev Lett, Vol: 134LISA Pathfinder was a mission designed to test key technologies required for gravitational wave detection in space. Magnetically driven forces play a key role in the instrument sensitivity in the low-frequency regime, which corresponds to the measurement band of interest for future space-borne gravitational wave observatories. Magnetically induced forces couple to the test mass motion, introducing a contribution to the relative acceleration noise between the free-falling test masses. In this Letter we present the first complete estimate of this term of the instrument performance model. Our results set the magnetic-induced acceleration noise during the February 2017 noise run of 0.25_{-0.08}^{+0.15} fm s^{-2}/sqrt[Hz] at 1 mHz and 1.01_{-0.24}^{+0.73} fm s^{-2}/sqrt[Hz] at 0.1 mHz. We also discuss how the nonstationarities of the interplanetary magnetic field can affect these values during extreme space weather conditions.
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