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Journal articleHayrapetyan A, Tumasyan A, Adam W, et al., 2023,
Search for a high-mass dimuon resonance produced in association with b quark jets at √s=13 TeV
, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479 -
Journal articleHayrapetyan A, Tumasyan A, Adam W, et al., 2023,
Search for new physics in multijet events with at least one photon and large missing transverse momentum in proton-proton collisions at 13 TeV
, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479 -
Journal articleAaij R, Abdelmotteleb ASW, Abellan Beteta C, et al., 2023,
Observation and branching fraction measurement of the decay Ξb- → Λ0 bπ -
, PHYSICAL REVIEW D, Vol: 108, ISSN: 2470-0010 -
Journal articleFujii Y, 2023,
A search for a muon to electron conversion in COMET
, Journal of Instrumentation, Vol: 18The COMET experiment at J-PARC, Japan, aims to search for muon to electron conversion with aluminium nuclei, achieving a sensitivity four orders of magnitude higher than the current upper limit at a 90% confidence level. The proton beam line has recently been completed, and muons have been successfully transported through the curved solenoid in the Phase-alpha of the experiment. In this paper, we will present preliminary results from the Phase-alpha beam measurement, the status of the intermediate sensitivity experiment (COMET Phase-I), and the ultimate goal of COMET Phase-II.
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Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
A search for decays of the Higgs boson to invisible particles in events with a top-antitop quark pair or a vector boson in proton-proton collisions at √s=13TeV
, European Physical Journal C, Vol: 83, ISSN: 1434-6044A search for decays to invisible particles of Higgsbosons produced in association with a top-antitop quark pairor a vector boson, which both decay to a fully hadronicfinal state, has been performed using proton-proton colli sion data collected at √s = 13 TeV by the CMS experimentat the LHC, corresponding to an integrated luminosity of138 fb−1. The 95% confidence level upper limit set on thebranching fraction of the 125 GeV Higgs boson to invisi ble particles, B(H → inv), is 0.54 (0.39 expected), assumingstandard model production cross sections. The results of thisanalysis are combined with previous B(H → inv) searchescarried out at √s = 7, 8, and 13 TeV in complementary pro duction modes. The combined upper limit at 95% confidencelevel on B(H → inv) is 0.15 (0.08 expected).A search for decays to invisible particles of Higgsbosons produced in association with a top-antitop quark pairor a vector boson, which both decay to a fully hadronicfinal state, has been performed using proton-proton colli sion data collected at √s = 13 TeV by the CMS experimentat the LHC, corresponding to an integrated luminosity of138 fb−1. The 95% confidence level upper limit set on thebranching fraction of the 125 GeV Higgs boson to invisi ble particles, B(H → inv), is 0.54 (0.39 expected), assumingstandard model production cross sections. The results of thisanalysis are combined with previous B(H → inv) searchescarried out at √s = 7, 8, and 13 TeV in complementary pro duction modes. The combined upper limit at 95% confidencelevel on B(H → inv) is 0.15 (0.08 expected).A search for decays to invisible particles of Higgsbosons produced in association with a top-antitop quark pairor a vector boson, which both decay to a fully hadronicfinal state, has been performed using proton-proton colli sion data collected at √s = 13 TeV by the CMS experimentat the LHC, corresponding to an integrated luminosity of138 fb−1. The 95%
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Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
Measurement of the top quark mass using a profile likelihoodapproach with the lepton + jets final states in proton–protoncollisions at √s = 13 TeV
, European Physical Journal C, Vol: 83, ISSN: 1434-6044The mass of the top quark is measured in36.3 fb−1 of LHC proton–proton collision data collected withthe CMS detector at √s = 13 TeV. The measurement uses asample of top quark pair candidate events containing one iso lated electron or muon and at least four jets in the final state.For each event, the mass is reconstructed from a kinematic fitof the decay products to a top quark pair hypothesis. A pro file likelihood method is applied using up to four observablesper event to extract the top quark mass. The top quark massis measured to be 171.77 ± 0.37 GeV. This approach signif icantly improves the precision over previous measure
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Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023,
Observation of New Ω 0 cStates Decaying to the Ξc plus K- Final State
, PHYSICAL REVIEW LETTERS, Vol: 131, ISSN: 0031-9007 -
Journal articleAccettura C, Adams D, Agarwal R, et al., 2023,
Towards a muon collider
, EUROPEAN PHYSICAL JOURNAL C, Vol: 83, ISSN: 1434-6044 -
Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023,
Evidence of a<i> J=ψK0S</i> Structure in B0 →<i> J=ψφK0S</i> Decays
, PHYSICAL REVIEW LETTERS, Vol: 131, ISSN: 0031-9007 -
Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
Search for supersymmetry in final states with a single electron or muon using angular correlations and heavy-object identification in proton-proton collisions at √<i>s</i>=13 TeV
, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479 -
Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
A search for new physics in central exclusive production using the missing mass technique with the CMS detector and the CMS-TOTEM precision proton spectrometer
, EUROPEAN PHYSICAL JOURNAL C, Vol: 83, ISSN: 1434-6044 -
Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
Measurement of the Dependence of the Hadron Production Fraction Ratios <i>f<sub>s</sub></i>/<i>f<sub>u</sub></i> and <i>f<sub>d</sub></i>/<i>f<sub>u</sub></i> on <i>B</i> Meson Kinematic Variables in Proton-Proton Collisions at √<i>s</i>=13 TeV
, PHYSICAL REVIEW LETTERS, Vol: 131, ISSN: 0031-9007 -
Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023,
Measurement of the mass difference and relative production rate of the Ωb- and Ξb- baryons
, PHYSICAL REVIEW D, Vol: 108, ISSN: 2470-0010 -
Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023,
Measurement of the Ratios of Branching Fractions R(D*) and R(D<SUP>0</SUP>)
, PHYSICAL REVIEW LETTERS, Vol: 131, ISSN: 0031-9007 -
Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
Search for a vector-like quark T′<i>→</i> tH via the diphoton decay mode of the Higgs boson in proton-proton collisions at √<i>s</i>=13 TeV
, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479 -
Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
Search for new heavy resonances decaying to WW, WZ, ZZ, WH, or ZH boson pairs in the all-jets final state in proton-proton collisions at s=13TeV
, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol: 844, ISSN: 0370-2693A search for new heavy resonances decaying to WW, WZ, ZZ, WH, or ZH boson pairs in the all-jets final state is presented. The analysis is based on proton-proton collision data recorded by the CMS detector in 2016–2018 at a centre-of-mass energy of 13 TeV at the CERN LHC, corresponding to an integrated luminosity of 138 fb−1. The search is sensitive to resonances with masses between 1.3 and 6TeV, decaying to bosons that are highly Lorentz-boosted such that each of the bosons forms a single large-radius jet. Machine learning techniques are employed to identify such jets. No significant excess over the estimated standard model background is observed. A maximum local significance of 3.6 standard deviations, corresponding to a global significance of 2.3 standard deviations, is observed at masses of 2.1 and 2.9 TeV. In a heavy vector triplet model, spin-1 Z′ and W′ resonances with masses below 4.8TeV are excluded at the 95% confidence level (CL). These limits are the most stringent to date. In a bulk graviton model, spin-2 gravitons and spin-0 radions with masses below 1.4 and 2.7TeV, respectively, are excluded at 95% CL. Production of heavy resonances through vector boson fusion is constrained with upper cross section limits at 95% CL as low as 0.1 fb.
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Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
Evidence for four-top quark production in proton-proton collisions at √s=13 TeV
, PHYSICS LETTERS B, Vol: 844, ISSN: 0370-2693 -
Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
Search for medium effects using jets from bottom quarks in PbPb collisions at s<inf>NN</inf>=5.02TeV
, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol: 844, ISSN: 0370-2693The first study of the shapes of jets arising from bottom (b) quarks in heavy ion collisions is presented. Jet shapes are studied using charged hadron constituents as a function of their radial distance from the jet axis. Lead-lead (PbPb) collision data at a nucleon-nucleon center-of-mass energy of sNN=5.02TeV were recorded by the CMS detector at the LHC, with an integrated luminosity of 1.69nb−1. Compared to proton-proton collisions, a redistribution of the energy in b jets to larger distances from the jet axis is observed in PbPb collisions. This medium-induced redistribution is found to be substantially larger for b jets than for inclusive jets.
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Journal articleTumasyan A, Adam W, Bergauer T, et al., 2023,
Two-particle azimuthal correlations in γp interactions using pPb collisions at s<inf><inf>NN</inf></inf>=8.16TeV
, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol: 844, ISSN: 0370-2693The first measurements of the Fourier coefficients (VnΔ) of the azimuthal distributions of charged hadrons emitted from photon-proton (γp) interactions are presented. The data are extracted from 68.8 nb−1 of ultra-peripheral proton-lead (pPb) collisions at sNN=8.16TeV using the CMS detector. The high energy lead ions produce a flux of photons that can interact with the oncoming proton. This γp system provides a set of unique initial conditions with multiplicity lower than in photon-lead collisions but comparable to recent electron-positron and electron-proton data. The VnΔ coefficients are presented in ranges of event multiplicity and transverse momentum (pT) and are compared to corresponding hadronic minimum bias pPb results. For a given multiplicity range, the mean pT of charged particles is smaller in γp than in pPb collisions. For both the γp and pPb samples, V1Δ is negative, V2Δ is positive, and V3Δ consistent with 0. For each multiplicity and pT range, V2Δ is larger for γp events. The γp data are consistent with model predictions that have no collective effects.
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Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
Search for new physics in the τ lepton plus missing transverse momentum final state in proton-proton collisions at √<i>s</i>=13 TeV
, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479 -
Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
Measurement of differential cross sections for the production of a Z boson in association with jets in proton-proton collisions at √<i>s</i>=13 TeV
, PHYSICAL REVIEW D, Vol: 108, ISSN: 2470-0010 -
Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023,
Measurement of the Prompt. 22° Nuclear Modification. Factor in p-Pb Collisions at √SNN=8.16 TeV br
, PHYSICAL REVIEW LETTERS, Vol: 131, ISSN: 0031-9007 -
Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
Search for a charged Higgs boson decaying into a heavy neutral Higgs boson and a W boson in proton-proton collisions at √<i>s</i>=13 TeV
, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479 -
Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023,
Model-independent measurement of charm mixing parameters in B<overline><i> →</i> D0(→ K0Sπ+π- )μ-ν<overline>μX decays
, PHYSICAL REVIEW D, Vol: 108, ISSN: 2470-0010 -
Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
Search for Exotic Higgs Boson Decays H → AA → 4γ with Events Containing Two Merged Diphotons in Proton-Proton Collisions at Vs=13 TeV
, PHYSICAL REVIEW LETTERS, Vol: 131, ISSN: 0031-9007 -
Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
Reconstruction of decays to merged photons using end-to-end deep learning with domain continuation in the CMS detector
, PHYSICAL REVIEW D, Vol: 108, ISSN: 2470-0010 -
Journal articleAbe K, Akhlaq N, Akutsu R, et al., 2023,
Measurements of neutrino oscillation parameters from the T2K experiment using 3.6×10²¹ protons on target
, European Physical Journal C: Particles and Fields, Vol: 83, ISSN: 1124-1861The T2K experiment presents new measurements of neutrino oscillation parameters using 19.7(16.3) ×1020 protons on target (POT) in (anti-)neutrino mode at thefar detector (FD). Compared to the previous analysis, anadditional 4.7 × 1020 POT neutrino data was collected atthe FD. Significant improvements were made to the analysis methodology, with the near-detector analysis introducing new selections and using more than double the data.Additionally, this is the first T2K oscillation analysis to useNA61/SHINE data on a replica of the T2K target to tune theneutrino flux model, and the neutrino interaction model wasimproved to include new nuclear effects and calculations.Frequentist and Bayesian analyses are presented, including results on sin2 θ13 and the impact of priors on the δCP measurement. Both analyses prefer the normal mass orderingand upper octant of sin2 θ23 with a nearly maximally CPviolating phase. Assuming the normal ordering and using theconstraint on sin2 θ13 from reactors, sin2 θ23 = 0.561+0.021 −0.032using Feldman–Cousins corrected intervals, and Δm232 =2.494+0.041−0.058 × 10−3 eV2 using constant Δχ2 intervals. TheCP-violating phase is constrained to δCP = −1.97+0.97 −0.70 usingFeldman–Cousins corrected intervals, and δCP = 0, π isexcluded at more than 90% confidence level. A Jarlskoginvariant of zero is excluded at more than 2σ credible levelusing a flat prior in δCP, and just below 2σ using a flat prior insin δCP. When the external constraint on sin2 θ13 is removed,sin2 θ13 = 28.0+2.8−6.5 × 10−3, in agreement with measurements from reactor experiments. These results are consistentwith previous T2K analyses.
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Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
Observation of Same-Sign <i>WW</i> Production from Double Parton Scattering in Proton-Proton 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,
Observation of the Rare Decay of the η Meson to Four Muons
, PHYSICAL REVIEW LETTERS, Vol: 131, ISSN: 0031-9007 -
Journal articleSherrill N, Parsons AO, Baynham CFA, et al., 2023,
Analysis of atomic-clock data to constrain variations of fundamental constants
, NEW JOURNAL OF PHYSICS, Vol: 25, ISSN: 1367-2630
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