First Evidence for Mixing-Induced (Formula presented) Violation in (Formula presented) Decays in (Formula presented) Collisions at (Formula presented) A. Hayrapetyan, A. Tumasyan, W. Adam, J. W. Andrejkovic, L. Benato, et al. Physical Review Letters, 2026 A novel machine-learning-based flavor-tagging algorithm combining same-side and opposite-side tagging is used to obtain the equivalent of 27 500 tagged B s 0 → J / ψ ϕ ( 1020 ) decays from p p collisions at s = 13 TeV , collected by the CMS experiment and corresponding to an integrated luminosity of 96.5 fb − 1 . A time- and flavor-dependent angular analysis of the μ + μ − K + K − final state, consistent with a ϕ ( 1020 ) → K + K − decay, is used to measure parameters of the B s 0 − B ¯ s 0 system. The weak phase is measured to be ϕ s = − 73 ± 22 ( stat ) ± 10 ( syst ) mrad , which, combined with the s = 8 TeV CMS result, gives ϕ s = − 75 ± 23 mrad . This value differs from zero by 3.2 standard deviations, providing the first evidence for mixing-induced C P violation in B s 0 → J / ψ ϕ ( 1020 ) decays. All measured physics parameters are found to agree with standard model predictions where available.
Search for Light Pseudoscalar Bosons, Pair-Produced in Higgs Boson Decays in the Four-Electron Final State in Proton-Proton Collisions at (Formula presented) A. Hayrapetyan, V. Makarenko, A. Tumasyan, W. Adam, J. W. Andrejkovic, et al. Physical Review Letters, 2026 A search for pairs of light neutral pseudoscalar bosons ( A ) resulting from the decay of a Higgs boson is performed. The search is conducted using LHC proton-proton collision data at s = 13 TeV , collected with the CMS detector in 2016–2018 and corresponding to an integrated luminosity of 138 fb − 1 . The A boson decays into a highly collimated electron-positron pair. A novel multivariate algorithm using tracks and calorimeter information is developed to identify these distinctive signatures, and events are selected with two such merged electron-positron pairs. No significant excess above the standard model background predictions is observed. Upper limits on the branching fraction for H → A A → 4 e are set at 95% confidence level, for masses between 10 and 100 MeV and proper decay lengths below 100 μ m , reaching branching fraction sensitivities as low as 10 − 5 . This is the first search for Higgs boson decays to four electrons via light pseudoscalars at the LHC. It significantly improves the experimental sensitivity to axionlike particles with masses below 100 MeV .
Measurement of the dineutrino system kinematic variables in dileptonic top quark pair production in proton-proton collisions at s=13 TeV The CMS collaboration, V. Chekhovsky, A. Hayrapetyan, V. Makarenko, A. Tumasyan, et al. Journal of High Energy Physics, 2026 A bstract Differential top quark pair production cross sections are measured in the dilepton final states e + e − , μ + μ − , and e ± μ ∓ , as a function of kinematic variables of the two-neutrino system: the transverse momentum $$ {p}_{\textrm{T}}^{\nu \nu} $$ p T νν of the dineutrino system, the minimum distance in azimuthal angle between $$ {\overrightarrow{p}}_{\textrm{T}}^{\nu \nu} $$ p → T νν and leptons, and in two dimensions in bins of both observables. The measurements are performed using CERN LHC proton-proton collisions at $$ \sqrt{s}=13 $$ s = 13 TeV, recorded by the CMS detector between 2016 and 2018, corresponding to an integrated luminosity of 138 fb − 1 . The measured cross sections are unfolded to the particle level using an unregularized least squares method. Results are compared with predictions by the standard model of particle physics, and found to be in agreement with theoretical calculations as well as Monte Carlo simulations.
Search for the nonresonant and resonant production of a Higgs boson in association with an additional scalar boson in the γγττ final state in proton-proton collisions at s=13 TeV The CMS collaboration, A. Hayrapetyan, A. Tumasyan, W. Adam, J. W. Andrejkovic, et al. Journal of High Energy Physics, 2026 A bstract The results of a search for the production of two scalar bosons in final states with two photons and two tau leptons are presented. The search considers both nonresonant production of a Higgs boson pair, HH, and resonant production via a new boson X which decays either to HH or to H and a new scalar Y. The analysis uses up to 138 fb − 1 of proton-proton collision data, recorded between 2016 and 2018 by the CMS experiment at the LHC at a center-of-mass energy of 13 TeV. No evidence for signal is found in the data. For the nonresonant production, the observed (expected) upper limit at 95% confidence level (CL) on the HH production cross section is set at 930 (740) fb, corresponding to 33 (26) times the standard model prediction. At 95% CL, HH production is observed (expected) to be excluded for values of κ λ outside the range between −12 (−9.4) and 17 (15). Observed (expected) upper limits at 95% CL for the X → HH cross section are found to be within 160 to 2200 (200 to 1800) fb, depending on the mass of X. In the X → Y(ττ)H(γγ) search, the observed (expected) upper limits on the product of the production cross section and decay branching fractions vary between 0.059–1.2 fb (0.087–0.68 fb). For the X → Y(γγ)H(ττ) search the observed (expected) upper limits on the product of the production cross section and Y → γγ branching fraction vary between 0.69–15 fb (0.73–8.3 fb) in the low Y mass search, tightening constraints on the next-to-minimal supersymmetric standard model, and between 0.64–10 fb (0.70–7.6 fb) in the high Y mass search.
Exploring small-angle emissions in charm quark jets in proton-proton collisions at s=5.02 TeV The CMS collaboration, V. Chekhovsky, A. Hayrapetyan, V. Makarenko, A. Tumasyan, et al. Journal of High Energy Physics, 2026 A bstract A measurement of the angular structure of inclusive jets and those containing a prompt D 0 meson in proton-proton collisions at the LHC at a center-of-mass energy of 5.02 TeV is presented. The data corresponding to an integrated luminosity of 301 pb − 1 were collected by the CMS experiment in 2017. Two jet grooming algorithms, late- k T and soft drop, are used to study the intrajet radiation pattern using iterative Cambridge-Aachen declustering. The splitting-angle distributions of jets with transverse momentum ( p T ) of around 100 GeV, obtained with these two algorithms, show that there is a shift of the distribution for jets containing a prompt D 0 meson with respect to inclusive jets. The suppression of emissions at small angles observed in the late- k T grooming approach is consistent with the dead-cone effect, whereas the similar suppression for splittings selected with the soft-drop algorithm appears to be induced by gluon splitting to charm quark-antiquark pairs at large angles. The measured distributions are corrected to the particle level and can be used to constrain model predictions for the substructure of high- p T charm quark jets.
Measurements of electroweak production of a photon in association with two jets in proton-proton collisions at s=13 TeV The CMS collaboration, A. Hayrapetyan, V. Makarenko, A. Tumasyan, W. Adam, et al. Journal of High Energy Physics, 2026 A bstract The first observation of electroweak production of a photon in association with two forward jets in proton-proton collisions is presented. The measurement uses data recorded by the CMS experiment at the LHC during 2016–2018 at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 138 fb − 1 . The analysis is performed in a region enriched in photon production via vector boson fusion, with a requirement on the transverse momentum of the photon to exceed 200 GeV. The cross section is measured to be $$ {202}_{-32}^{+36} $$ 202 − 32 + 36 fb, at a significance with respect to the null hypothesis that exceeds five standard deviations. This is in agreement with the standard model prediction of $$ {177}_{-12}^{+13} $$ 177 − 12 + 13 fb. Differential cross sections are measured as a function of various observables. Limits are set on dimension-6 effective field theory operators that contribute to the WWγ interaction. The observed 95% confidence intervals for the corresponding Warsaw basis Wilson coefficients c W and c HWB are [ − 0 . 11 , 0 . 16] and [ − 1 . 6 , 1 . 5], respectively.
Observation of Suppressed Charged-Particle Production in Ultrarelativistic Oxygen-Oxygen Collisions A. Hayrapetyan, V. Makarenko, A. Tumasyan, W. Adam, L. Benato, et al. Physical Review Letters, 2026 A hot and dense state of nuclear matter, known as the quark-gluon plasma, is created in collisions of ultrarelativistic heavy nuclei. Highly energetic quarks and gluons, collectively referred to as partons, lose energy as they travel through this matter, leading to suppressed production of particles with large transverse momenta ( p T ). Conversely, high- p T particle suppression has not been seen in proton-lead collisions, raising questions regarding the minimum system size required to observe parton energy loss. Oxygen-oxygen (OO) collisions examine a region of effective system size that lies between these two extreme cases. The CMS detector at the CERN LHC has been used to quantify charged-particle production in inclusive OO collisions for the first time via measurements of the nuclear modification factor ( R AA ). The R AA is derived by comparing particle production to expectations based on proton-proton ( p p ) data and has a value of unity in the absence of nuclear effects. The data for OO and p p collisions at a nucleon-nucleon center-of-mass energy s NN = 5.36 TeV correspond to integrated luminosities of 6.1 nb − 1 and 1.02 pb − 1 , respectively. The R AA is below unity with a minimum of 0.69 ± 0.04 around p T = 6 GeV . The data exhibit better agreement with theoretical models incorporating parton energy loss as compared to baseline models without energy loss.
High-precision measurement of the W boson mass with the CMS experiment V. Chekhovsky, A. Hayrapetyan, V. Makarenko, A. Tumasyan, W. Adam, et al. Nature, 2026 In the standard model of particle physics, the masses of the W and Z bosons, the carriers of the weak interaction, are uniquely related. A precise determination of their masses is important because quantum loops of heavy, undiscovered particles could modify this relationship. Although the Z mass is known to the remarkable precision of 22 parts per million (2.0 MeV), the W mass is known much less precisely. A global fit to measured electroweak observables predicts the W mass with 6 MeV uncertainty 1–3 . Reaching a comparable experimental precision would be a sensitive and fundamental test of the standard model, made even more urgent by a recent challenge to the global fit prediction by a measurement from the CDF Collaboration at the Fermilab Tevatron collider 4 . Here we report the measurement of the W mass by the CMS Collaboration at the CERN Large Hadron Collider, based on a large data sample of W → μν events collected in 2016 at the proton–proton collision energy of 13 TeV. The measurement exploits a high-granularity maximum likelihood fit to the kinematic properties of muons produced in W decays. By combining an accurate determination of experimental effects with marked in situ constraints of theoretical inputs, we reach a precise measurement of the W mass, of 80,360.2 ± 9.9 MeV, in agreement with the standard model prediction.
High-level hadronic tau lepton triggers of the CMS experiment in proton-proton collisions at √s = 13.6 TeV A. Hayrapetyan, V. Makarenko, A. Tumasyan, W. Adam, L. Benato, et al. Journal of Instrumentation, 2026 The trigger system of the CMS detector is pivotal in the acquisition of data for physics measurements and searches. Studies of final states characterized by hadronic decays of tau leptons require the reconstruction and the identification of genuine tau leptons against quark- and gluon-initiated jets at the trigger level. This is a difficult task, particularly as improvements to the LHC have resulted in an increased number of interactions per bunch crossing in recent years. To address this challenge, a series of machine-learning algorithms with high identification efficiency and low computational cost have been incorporated into the high-level trigger for hadronically decaying tau leptons. In this paper, these developments and the trigger performance are summarized using data collected by the CMS experiment in proton-proton collisions at √( s ) = 13.6 TeV in 2022–2023, corresponding to an integrated luminosity of 62 fb -1 .
A hadronic calorimeter based on resistive micropattern gaseous detectors Lisa Generoso, Maria Grazia Alviggi, Michele Bianco, Maryna Borysova, Michela Biglietti, et al. Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment, 2025
Resistive MPGD-based HCAL for future colliders Muhammad Ali, Anna Stamerra, Rosamaria Venditti, Marco Buonsante, Anna Colaleo, et al. Proceedings of the International Workshop on Advances in Sensors and Interfaces Iwasi, 2025
Fast Timing MPGD for ToF-PET F. Errico, A. Colaleo, M. Maggi, A. Pellecchia, R. Radogna, et al. Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment, 2022
Search for new long-lived particles at s=13 TeV A.M. Sirunyan, A. Tumasyan, W. Adam, F. Ambrogi, E. Asilar, et al. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, 2018
The status of the GEM project for CMS high-η muon system D. Abbaneo, M. Abbrescia, C. Armagnaud, P. Aspell, Y. Assran, et al. Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment, 2013
Potential Impact of a New GEM-based Detector on CMS Triggering Meeting of the American Physical Society Division of Particles and Fields Dpf 2013, 2013
Resistive plate chamber commissioning and performance in CMS G. Roselli, M. Abbrescia, G. Iaselli, B. Marangelli, S. Natali, et al. Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment, 2009
The compact muon solenoid RPC barrel detector A. Colaleo, F. Loddo, M. Maggi, A. Ranieri, M. Abbrescia, et al. Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment, 2009
The CMS experiment at the CERN LHC The CMS Collaboration, S Chatrchyan, G Hmayakyan, V Khachatryan, A M Sirunyan, et al. Journal of Instrumentation, 2008
Search for neutral MSSM Higgs bosons at LEP The LEP Working Group for Higgs Boson Searches, S. Schael, R. Barate, R. Brunelière, I. De Bonis, et al. European Physical Journal C, 2006
Search for pentaquark states in Z decays S. Schael, R. Barate, R. Brunelière, I. De Bonis, D. Decamp, et al. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, 2004
Neutron irradiation of RPCs for the CMS experiment M Abbrescia, A Colaleo, G Iaselli, F Loddo, M Maggi, et al. Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment, 2003
The RPC system for the CMS experiment at the LHC M. Abbrescia, A. Colaleo, G. Iaselli, F. Loddo, M. Maggi, et al. Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment, 2003
First results on RB2 muon barrel RPC detector for CMS M Abbrescia, S Altieri, G Belli, G Bruno, A Colaleo, et al. Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment, 2003
Experimental results on RPC neutron sensitivity M. Abbrescia, S. Altieri, V. Baratti, O. Barnabà, G. Belli, et al. Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment, 2003
Search for γγ → ηb in e+e- collisions at LEP 2 A. Heister, S. Schael, R. Barate, R. Brunelière, I. De Bonis, et al. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, 2002
Leptonic decays of the Ds meson A. Heister, S. Schael, R. Barate, I. De Bonis, D. Decamp, et al. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, 2002
Production of Ds** mesons in hadronic Z decays A. Heister, S. Schael, R. Barate, I. De Bonis, D. Decamp, et al. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, 2002
The resistive plate chambers for CMS and their simulation M Abbrescia, A Colaleo, G Iaselli, F Loddo, M Maggi, et al. Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment, 2001
Simulation of Resistive Plate Chamber sensitivity to neutrons S. Altieri, G. Belli, G. Bruno, M. Merlo, S.P. Ratti, et al. Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment, 2001
Bakelite for the RPCs of the experiment CMS S Altieri, G Belli, G Bruno, R Guida, M Merlo, et al. Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment, 2000
RPC γ sensitivity simulation S Altieri, G Belli, G Bruno, G Gianini, M Merlo, et al. Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment, 2000
Bose-Einstein correlations in W-pair decays R. Barate, D. Decamp, P. Ghez, C. Goy, S. Jezequel, et al. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, 2000
Recent results and developments on double-gap RPCs for CMS M. Abbrescia, A. Colaleo, G. Iaselli, F. Loddo, M. Maggi, et al. Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment, 1998
Updated measurement of the τ lepton lifetime R. Barate, D. Buskulic, D. Decamp, P. Ghez, C. Goy, et al. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, 1997
Search for the Bc meson in hadronic Z decays R. Barate, D. Buskulic, D. Decamp, P. Ghez, C. Goy, et al. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, 1997
A measurement of Rb using a lifetime-mass tag R. Barate, D. Buskulic, D. Decamp, P. Ghez, C. Goy, et al. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, 1997
Charm counting in b decays D. Buskulic, I. De Bonis, D. Decamp, P. Ghez, C. Goy, et al. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, 1996
Search for excited leptons at 130-140 GeV D. Buskulic, I. De Bonis, D. Decamp, P. Ghez, C. Goy, et al. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, 1996
Search for CP violation in the decay Z → b b̄ g D. Buskulic, I. De Bonis, D. Decamp, P. Ghez, C. Goy, et al. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, 1996
Measurement of the mass of the Λb baryon D. Buskulic, I. De Bonis, D. Decamp, P. Ghez, C. Goy, et al. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, 1996
Measurement of Λ polarization from Ζ decays D. Buskulic, I. De Bonis, D. Decamp, P. Ghez, C. Goy, et al. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, 1996
Measurement of the Λb polarization in Z decays D Buskulic, D Casper, I De Bonis, D Decamp, P Ghez, et al. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, 1996
Mass limit for the lightest neutralino ALEPH Collaboration, D. Buskulic, I. Bonis, D. Decamp, P. Ghez, et al. Zeitschrift Fur Physik C Particles and Fields, 1996
Search for a new resonance decaying to a Higgs boson and a scalar boson in events with two b jets and two Z bosons in proton-proton collisions at = 13.6 TeV A Hayrapetyan, V Makarenko, A Tumasyan, W Adam, L Benato, ... 2026
Search for pair production of heavy resonances in final states with a photon and large-radius jets in proton-proton collisions at = 13 TeV A Hayrapetyan, V Makarenko, A Tumasyan, W Adam, JW Andrejkovic, ... 2026
Observation of nuclear suppression in coherent photoproduction off heavy nuclei at the LHC A Belyaev, C Daumann, CA Carrillo Montoya, DM Newbold, W Carvalho, ... 2026
Combined effective field theory interpretation of Higgs boson, electroweak vector boson, top quark, and multijet measurements VRESP AAO, SVWMS SVAGRPMMGALBPAESDSTQ, ... The European Physical Journal. C, Particles and Fields. 86 (4), 331 , 2026 2026 Citations: 35
Search for low-mass hidden-valley dark showers with non-prompt muon pairs in proton-proton collisions at√ 𝒔= 13 TeV A Hayrapetyan, V Makarenko, A Tumasyan, W Adam, JW Andrejkovic, ... Springer Nature , 2026 2026
arXiv : Measurement of B meson production fraction ratios in proton-proton collisions at = 13 TeV using open-charm and charmonium decays A Hayrapetyan, C Daumann, CA Carrillo Montoya, DM Newbold, ... 2026
Full event interpretation with machine-learning-based particle-flow reconstruction in the CMS detector A Hayrapetyan, V Makarenko, A Tumasyan, W Adam, L Benato, ... 2026
Search for heavy scalar resonances decaying to Lorentz-boosted Higgs and Higgs-like bosons in the final state at 13 TeV A Hayrapetyan, C Daumann, CA Carrillo Montoya, DM Newbold, ... 2026
Search for heavy long-lived charged particles with level-1 trigger scouting data from proton-proton collisions at 13.6 TeV A Hayrapetyan, C Daumann, CA Carrillo Montoya, DM Newbold, ... 2026
Search for a boosted Higgs boson decaying to bottom quark pairs in association with a W or Z boson in proton-proton collisions at = 13 TeV A Hayrapetyan, V Makarenko, A Tumasyan, W Adam, JW Andrejkovic, ... 2026
Search for exotic Higgs boson decays H with in events with a semi-merged topology in proton-proton collisions at = 13 TeV A Hayrapetyan, V Makarenko, A Tumasyan, W Adam, JW Andrejkovic, ... 2026
Measurements of the inclusive W and Z boson production cross sections and their ratios in proton-proton collisions at TeV V Chekhovsky, A Hayrapetyan, V Makarenko, A Tumasyan, W Adam, ... Journal of High Energy Physics 2026 (1), 47 , 2026 2026 Citations: 4
Search for light pseudoscalar bosons, pair-produced in Higgs boson decays in the four-electron final state in proton-proton collisions at = 13 TeV A Hayrapetyan, V Makarenko, A Tumasyan, W Adam, JW Andrejkovic, ... 2025
Search for a new scalar resonance decaying to a Higgs boson and another new scalar particle in the final state with two bottom quarks and two photons in proton-proton … A Hayrapetyan, V Makarenko, A Tumasyan, W Adam, JW Andrejkovic, ... Journal of High Energy Physics 2025 (12), 178 , 2025 2025 Citations: 4
Search for charged lepton flavor violating and boson decays in proton-proton collisions at A Hayrapetyan, V Makarenko, A Tumasyan, W Adam, JW Andrejkovic, ... Physical Review D 112 (11), 112011 , 2025 2025 Citations: 2
Search for charged-lepton flavour violation in top quark interactions with an up-type quark, a muon, and a τ lepton in proton-proton collisions at TeV A Hayrapetyan, A Tumasyan, W Adam, JW Andrejkovic, L Benato, ... Journal of High Energy Physics 2025 (12), 65 , 2025 2025
Search for production and constraints on the Yukawa couplings of light quarks to the Higgs boson V Chekhovsky, A Hayrapetyan, V Makarenko, A Tumasyan, W Adam, ... Physical review D 112 (11), 112001 , 2025 2025 Citations: 7
Search for low-mass hidden-valley dark showers with non-prompt muon pairs in proton-proton collisions at = 13 TeV A Hayrapetyan, V Makarenko, A Tumasyan, W Adam, JW Andrejkovic, ... 2025
Search for single production of a vector-like T quark decaying to a top quark and a neutral scalar boson in the lepton+ jets final state in proton-proton collisions at $\sqrt … A Hayrapetyan, V Makarenko, A Tumasyan, W Adam, JW Andrejkovic, ... 2025 Citations: 3
Measurement of the ratio of the B J/ and B J/ branching fractions using three-prong lepton decays V Chekhovsky, A Hayrapetyan, V Makarenko, A Tumasyan, W Adam, ... 2025
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Precision electroweak measurements on the Z resonance S Schael, R Barate, R Bruneliere, D Buskulic, BI De, D Decamp, P Ghez, ... Elsevier , 2006 2006 Citations: 2338
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