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Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023,
Measurement of the Time-Integrated CP Asymmetry in DKK Decays
, PHYSICAL REVIEW LETTERS, Vol: 131, ISSN: 0031-9007 -
Journal articleAaij R, Abdelmotteleb ASW, Abellan Beteta C, et al., 2023,
Observation of the <i>B</i><SUP>+</SUP> → <i>J</i>ψη'<i>K</i><SUP>+</SUP> decay
, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479 -
Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
Measurement of the electroweak production of Wγ in association with two jets in proton-proton collisions at √s=13 TeV
, Physical Review D: Particles, Fields, Gravitation and Cosmology, Vol: 108, ISSN: 1550-2368A measurement is presented for the electroweak production of a 𝑊 boson, a photon (𝛾), and two jets (j) in proton-proton collisions. The leptonic decay of the 𝑊 boson is selected by requiring one identified electron or muon and large missing transverse momentum. The two jets are required to have large invariant dijet mass and large separation in pseudorapidity. The measurement is performed with the data collected by the CMS detector at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 138 fb−1. The cross section for the electroweak 𝑊𝛾jj production is 23.5+4.9−4.7 fb, whereas the total cross section for 𝑊𝛾jj production is 113 ±13 fb. Differential cross sections are also measured with the distributions unfolded to the particle level. All results are in agreement with the standard model expectations. Constraints are placed on anomalous quartic gauge couplings (aQGCs) in terms of dimension-8 effective field theory operators. These are the most stringent limits to date on the aQGCs parameters 𝑓M,2–5/Λ4 and 𝑓T,6–7/Λ4.
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Journal articleBashyal A, Akhter S, Dar ZA, et al., 2023,
High-statistics measurement of antineutrino quasielasticlike scattering at E?-6 GeV on a hydrocarbon target
, PHYSICAL REVIEW D, Vol: 108, ISSN: 2470-0010 -
Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023,
Associated production of prompt J/ψ and (sic) mesons in pp collisions at √s=13 TeV
, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479 -
Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023,
Study of charmonium decays to <i>K</i><sub>S</sub><SUP>0</SUP><i>K</i>π in the <i>B</i> → (<i>K</i><sub>S</sub><SUP>0</SUP><i>K</i>π)<i>K</i> channels
, PHYSICAL REVIEW D, Vol: 108, ISSN: 2470-0010 -
Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023,
First observation of the B<SUP>+</SUP> → D<sub>s</sub><SUP>+</SUP> <i>D<sub>s</sub><SUP>-</SUP></i> K<SUP>+</SUP> decay
, PHYSICAL REVIEW D, Vol: 108, ISSN: 2470-0010 -
Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023,
Observation of a Resonant Structure near the Ds plus <i> Ds-</i> Threshold in the B plus ? Ds plus <i> Ds-</i> K plus Decay
, PHYSICAL REVIEW LETTERS, Vol: 131, ISSN: 0031-9007 -
Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
Search for a heavy composite Majorana neutrino in events with dilepton signatures from proton-proton collisions at √s=13 Tev
, Physics Letters B, Vol: 843, ISSN: 0370-2693Results are presented of a search for a heavy Majorana neutrino Image 1 decaying into two same-flavor leptons ℓ (electrons or muons) and a quark-pair jet. A model is considered in which the Image 1 is an excited neutrino in a compositeness scenario. The analysis is performed using a sample of proton-proton collisions at √s = 13 TeV recorded by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 138 fb−1. The data are found to be in agreement with the standard model prediction. For the process in which the Image 1 is produced in association with a lepton, followed by the decay of the Image 1 to a same-flavor lepton and a quark pair, an upper limit at 95% confidence level on the product of the cross section and branching fraction is obtained as a function of the Image 1 mass Image 2 and the compositeness scale Λ. For this model the data exclude the existence of Image 3 (Image 4) for Image 2 below 6.0 (6.1) TeV, at the limit where Image 2 is equal to Λ. For Image 5, values of Λ less than 20 (23) TeV are excluded. These results represent a considerable improvement in sensitivity, covering a larger parameter space than previous searches in Image 6 collisions at 13 TeV.
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Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023,
Evidence for Modification of <i>b</i> Quark Hadronization in High-Multiplicity <i>pp</i> Collisions at √<i>s</i>=13 TeV
, PHYSICAL REVIEW LETTERS, Vol: 131, ISSN: 0031-9007 -
Journal articleHayrapetyan A, Tumasyan A, Adam W, et al., 2023,
Measurements of inclusive and differential cross sections for the Higgs boson production and decay to four-leptons in proton-proton collisions at √s=13 TeV
, The Journal of High Energy Physics, Vol: 2023, ISSN: 1029-8479Measurements of the inclusive and differential fiducial cross sections for the Higgs boson production in the H → ZZ → 4ℓ (ℓ = e, μ) decay channel are presented. The results are obtained from the analysis of proton-proton collision data recorded by the CMS experiment at the CERN LHC at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 138 fb−1. The measured inclusive fiducial cross section is 2.73 ± 0.26 fb, in agreement with the standard model expectation of 2.86 ± 0.1 fb. Differential cross sections are measured as a function of several kinematic observables sensitive to the Higgs boson production and decay to four leptons. A set of double-differential measurements is also performed, yielding a comprehensive characterization of the four leptons final state. Constraints on the Higgs boson trilinear coupling and on the bottom and charm quark coupling modifiers are derived from its transverse momentum distribution. All results are consistent with theoretical predictions from the standard model.
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Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023,
Publisher Erratum: Open charm production and asymmetry in <i>p</i>Ne collisions at √<SUP>s</SUP>NN =68.5 GeV (vol 83, 541, 2023)
, EUROPEAN PHYSICAL JOURNAL C, Vol: 83, ISSN: 1434-6044 -
Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023,
Search for <i>CP</i> violation using (T)over-cap-odd correlations in <i>B</i><SUP>0</SUP> → <i>p</i>(<i>p</i>)over-bar<i>K</i><SUP>+</SUP> π<SUP>-</SUP> decays
, PHYSICAL REVIEW D, Vol: 108, ISSN: 2470-0010 -
Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
Search for Higgs boson decay to a charm quark-antiquark pair in proton-proton collisions at sqrt[s]=13 TeV.
, Physical Review Letters, Vol: 131, ISSN: 0031-9007A search for the standard model Higgs boson decaying to a charm quark-antiquark pair, H → c¯c, produced in association with a leptonically decaying V (W or Z) boson is presented. The search is performed with proton-proton collisions at sqrt[s]=13 TeV collected by the CMS experiment, corresponding to an integrated luminosity of 138 fb−1. Novel charm jet identification and analysis methods using machinelearning techniques are employed. The analysis is validated by searching for Z → c¯c in VZ events, leading to its first observation at a hadron collider with a significance of 5.7 standard deviations. The observed (expected) upper limit on σðVHÞBðH → c¯cÞ is 0.94 (0.50þ0.22 −0.15 )pb at 95% confidence level (C.L.), corresponding to 14 (7.6þ3.4−2.3 ) times the standard model prediction. For the Higgs-charm Yukawa coupling modifier, κc, the observed (expected) 95% C.L. interval is 1.1 < jκcj < 5.5 (jκcj < 3.4), the most stringent constraint to date.
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Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023,
Multidifferential study of identified charged hadron distributions in Z-tagged jets in proton-proton collisions at v<i>s</i>=13 TeV
, PHYSICAL REVIEW D, Vol: 108, ISSN: 2470-0010 -
Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023,
Search for <i>K</i><sub>S(L)</sub><SUP>0</SUP> → μ<SUP>+</SUP> μ<SUP>-</SUP> μ<SUP>+</SUP> μ<SUP>-</SUP> decays at LHCb
, PHYSICAL REVIEW D, Vol: 108, ISSN: 2470-0010 -
Conference paperFujii Y, Miyataki M, Lee M, et al., 2023,
Online Machine-Learning-Based Event Selection for COMET Phase-I
, NuFACT 2022, Publisher: MDPI, Pages: 32-32 -
Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023,
Measurement of lepton universality parameters in B plus ? K plus l + l - and B0? K?0l+l- decays
, PHYSICAL REVIEW D, Vol: 108, ISSN: 2470-0010 -
Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023,
Test of Lepton Universality in <i>b</i> → <i>sl</i><SUP>+</SUP> <i>l</i><SUP>-</SUP> Decays
, PHYSICAL REVIEW LETTERS, Vol: 131, ISSN: 0031-9007 -
Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
Constraints on anomalous Higgs boson couplings to vector bosons and fermions from the production of Higgs bosons using the tt final state
, Physical Review D (particles, fields, gravitation, and cosmology), Vol: 108, ISSN: 2470-0010A study of anomalous couplings of the Higgs boson to vector bosons and fermions is presented. The datawere recorded by the CMS experiment at a center-of-mass energy of pp collisions at the LHC of 13 TeVandcorrespond to an integrated luminosity of 138 fb−1. The study uses Higgs boson candidates producedmainly in gluon fusion or electroweak vector boson fusion at the LHC that subsequently decay to a pair of τleptons. Matrix-element and machine-learning techniques were employed in a search for anomalousinteractions. The results are combined with those from the four-lepton and two-photon decay channels toyield the most stringent constraints on anomalous Higgs boson couplings to date. The pure CP-oddscenario of the Higgs boson coupling to gluons is excluded at 2.4 standard deviations. The results areconsistent with the standard model predictions.
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Journal articleTumasyan A, Adam W, Bergauer T, et al., 2023,
Azimuthal correlations within exclusive dijets with large momentum transfer in photon-lead collisions
, Physical Review Letters, Vol: 131, ISSN: 0031-9007The structure of nucleons is multidimensional and depends on the transverse momenta, spatial geometry, and polarization of the constituent partons. Such a structure can be studied using high-energy photons produced in ultraperipheral heavy-ion collisions. The first measurement of the azimuthal angular correlations of exclusively produced events with two jets in photon-lead interactions at large momentum transfer is presented, a process that is considered to be sensitive to the underlying nuclear gluon polarization. This study uses a data sample of ultraperipheral lead-lead collisions at √𝑠NN=5.02 TeV, corresponding to an integrated luminosity of 0.38 nb−1, collected with the CMS experiment at the LHC. The measured second harmonic of the correlation between the sum and difference of the two jet transverse momentum vectors is found to be positive, and rising, as the dijet transverse momentum increases. A well-tuned model that has been successful at describing a wide range of proton scattering data from the HERA experiments fails to describe the observed correlations, suggesting the presence of gluon polarization effects.
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Journal articleRamirez MA, Akhter S, Dar ZA, et al., 2023,
Neutrino-Induced Coherent π<SUP>+</SUP> Production in C, CH, Fe, and Pb at ⟨<i>E</i><sub>ν</sub>⟩ ∼ 6 GeV
, PHYSICAL REVIEW LETTERS, Vol: 131, ISSN: 0031-9007 -
Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
Search for new physics using effective field theory in 13 TeV 𝑝𝑝 collision events that contain a top quark pair and a boosted 𝑍 or Higgs boson
, Physical Review D (particles, fields, gravitation, and cosmology), Vol: 108, ISSN: 2470-0010A data sample containing top quark pairs (t¯t) produced in association with a Lorentz-boosted Z or Higgsboson is used to search for signs of new physics using effective field theory. The data correspond to anintegrated luminosity of 138 fb−1 of proton-proton collisions produced at a center-of-mass energy of13 TeV at the LHC and collected by the CMS experiment. Selected events contain a single lepton andhadronic jets, including two identified with the decay of bottom quarks, plus an additional large-radius jetwith high transverse momentum identified as a Z or Higgs boson decaying to a bottom quark pair. Machinelearning techniques are employed to discriminate between t¯tZ or t¯tH events and events from backgroundprocesses, which are dominated by t¯t þ jets production. No indications of new physics are observed. Thesignal strengths of boosted t¯tZ and t¯tH production are measured, and upper limits are placed on the t¯tZ andt¯tH differential cross sections as functions of the Z or Higgs boson transverse momentum. The effects ofnew physics are probed using a framework in which the standard model is considered to be the low-energyeffective field theory of a higher energy scale theory. Eight possible dimension-six operators are added tothe standard model Lagrangian, and their corresponding coefficients are constrained via fits to the data.A data sample containing top quark pairs (t¯t) produced in association with a Lorentz-boosted Z or Higgsboson is used to search for signs of new physics using effective field theory. The data correspond to anintegrated luminosity of 138 fb−1 of proton-proton collisions produced at a center-of-mass energy of13 TeV at the LHC and collected by the CMS experiment. Selected events contain a single lepton andhadronic jets, including two identified with the decay of bottom quarks, plus an additional large-radius jetwith high transverse momentum identified as a Z or Higgs boson decayi
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Journal articleAdam W, Bergauer T, Damanakis K, et al., 2023,
Evaluation of HPK n plus -p planar pixel sensors for the CMS Phase-2 upgrade
, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, Vol: 1053, ISSN: 0168-9002 -
Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
Azimuthal correlations in Z +jets events in proton-proton collisions at s=13TeV
, European Physical Journal C: Particles and Fields, Vol: 83, ISSN: 1434-6052The production of Z bosons associated with jets is measured in pp collisions at s=13TeV with data recorded with the CMS experiment at the LHC corresponding to an integrated luminosity of 36.3fb-1. The multiplicity of jets with transverse momentum pT>30GeV is measured for different regions of the Z boson's pT(Z), from lower than 10GeV to higher than 100GeV. The azimuthal correlation Δϕ between the Z boson and the leading jet, as well as the correlations between the two leading jets are measured in three regions of pT(Z). The measurements are compared with several predictions at leading and next-to-leading orders, interfaced with parton showers. Predictions based on transverse-momentum dependent parton distributions and corresponding parton showers give a good description of the measurement in the regions where multiple parton interactions and higher jet multiplicities are not important. The effects of multiple parton interactions are shown to be important to correctly describe the measured spectra in the low pT(Z) regions.
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Journal articleAcar B, Adamov G, Adloff C, et al., 2023,
Neutron irradiation and electrical characterisation of the first 8" silicon pad sensor prototypes for the CMS calorimeter endcap upgrade
, JOURNAL OF INSTRUMENTATION, Vol: 18, ISSN: 1748-0221 -
Journal articleAcar B, Adamov G, Adloff C, et al., 2023,
Performance of the CMS High Granularity Calorimeter prototype to charged pion beams of 20-300 GeV/c
, JOURNAL OF INSTRUMENTATION, Vol: 18, ISSN: 1748-0221 -
Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
Measurements of jet multiplicity and jet transverse momentum in multijet events in proton-proton collisions at √<i>s</i>=13 TeV
, European Physical Journal C, Vol: 83, ISSN: 1434-6044Multijet events at large transverse momentum(pT) are measured at √s = 13 TeV using data recordedwith the CMS detector at the LHC, corresponding to anintegrated luminosity of 36.3 fb−1. The multiplicity of jetswith pT > 50 GeV that are produced in association with ahigh-pT dijet system is measured in various ranges of thepT of the jet with the highest transverse momentum and asa function of the azimuthal angle difference Δφ1,2 betweenthe two highest pT jets in the dijet system. The differentialproduction cross sections are measured as a function of thetransverse momenta of the four highest pT jets. The mea surements are compared with leading and next-to-leadingorder matrix element calculations supplemented with simula tions of parton shower, hadronization, and multiparton inter actions. In addition, the measurements are compared withnext-to-leading order matrix element calculations combinedwith transverse-momentum dependent parton densities andtransverse-momentum dependent parton shower.
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Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023,
Λ<sub>c</sub>+ polarimetry using the dominant hadronic mode
, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479 -
Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
Search for high-mass exclusive γγ → WW and γγ → ZZ production in proton-proton collisions at √s = 13 TeV
, The Journal of High Energy Physics, Vol: 2023, ISSN: 1029-8479A search is performed for exclusive high-mass γγ → WW and γγ → ZZ production in proton-proton collisions using intact forward protons reconstructed in near-beam detectors, with both weak bosons decaying into boosted and merged jets. The analysis is based on a sample of proton-proton collisions collected by the CMS and TOTEM experiments at √s = 13 TeV, corresponding to an integrated luminosity of 100 fb−1. No excess above the standard model background prediction is observed, and upper limits are set on the pp → pWWp and pp → pZZp cross sections in a fiducial region defined by the diboson invariant mass m(VV) > 1 TeV (with V = W, Z) and proton fractional momentum loss 0.04 < ξ < 0.20. The results are interpreted as new limits on dimension-6 and dimension-8 anomalous quartic gauge couplings.
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