Publications
1568 results found
Tumasyan 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: 0370-2693
Tumasyan A, Adam W, Andrejkovic JW, et al., 2023, Measurement of the cross section of top quark-antiquark pair production in association with a W boson in proton-proton collisions at √s=13 TeV, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
Tumasyan A, Adam W, Andrejkovic JW, et al., 2023, Search for long-lived particles using out-of-time trackless jets in proton-proton collisions at √<i>s</i>=13 TeV, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
Tumasyan A, Adam W, Andrejkovic JW, et al., 2023, Search for resonant and nonresonant production of pairs of dijet resonances in proton-proton collisions at √s=13 TeV, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
Tumasyan A, Adam W, Andrejkovic JW, et al., 2023, Searches for additional Higgs bosons and for vector leptoquarks in ττ final states in proton-proton collisions at √<i>s</i>=13 TeV, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
Tumasyan A, Adam W, Andrejkovic JW, et al., 2023, Measurement of the B<sub>s</sub><SUP>0</SUP> = μ<SUP>+</SUP>μ<SUP>-</SUP> decay properties and search for the B<SUP>0</SUP> → μ<SUP>+</SUP>μ<SUP>-</SUP> decay in proton-proton collisions at √<i>s</i>=13 TeV, PHYSICS LETTERS B, Vol: 842, ISSN: 0370-2693
Tumasyan A, Adam W, Andrejkovic JW, et al., 2023, Precision measurement of the Z boson invisible width in pp collisions √s=13 TeV, PHYSICS LETTERS B, Vol: 842, ISSN: 0370-2693
Tumasyan A, Adam W, Andrejkovic JW, et al., 2023, Search for electroweak production of charginos and neutralinos at √<i>s</i>=13 Tev in final states containing hadronic decays of WW, WZ, or WH and missing transverse momentum, PHYSICS LETTERS B, Vol: 842, ISSN: 0370-2693
Tumasyan A, Adam W, Andrejkovic JW, et al., 2023, Search for Higgs boson decays into Z and J/ψ and for Higgs and Z boson decays into J/ψ or Y pairs in pp collisions at √s=13 TeV, PHYSICS LETTERS B, Vol: 842, ISSN: 0370-2693
Tumasyan A, Adam W, Andrejkovic JW, et al., 2023, Measurement of inclusive and differential cross sections for single top quark production in association with a W boson in proton-proton collisions at √<i>s</i>=13TeV, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
Tumasyan A, Collaboration TCMS, Adam W, et al., 2023, Observation of electroweak W<SUP>+</SUP>W<SUP>-</SUP> pair production in association with two jets in proton-proton collisions at √s=13 TeV, PHYSICS LETTERS B, Vol: 841, ISSN: 0370-2693
Sirunyan AM, Tumasyan A, Adam W, et al., 2023, Measurement of prompt and nonprompt charmonium suppression in PbPb collisions at 5.02 TeV (vol 78, 509, 2018), EUROPEAN PHYSICAL JOURNAL C, Vol: 83, ISSN: 1434-6044
Bertone G, Buchmueller OLL, Cole PSS, 2023, Perspectives on fundamental cosmology from Low Earth Orbit and the Moon, NPJ MICROGRAVITY, Vol: 9
Tumasyan A, Adam W, Andrejkovic JW, et al., 2023, Observation of triple J/ψ meson production in proton-proton collisions, NATURE PHYSICS, ISSN: 1745-2473
Buchmueller O, Ellis J, Schneider U, 2023, Large-scale atom interferometry for fundamental physics, Contemporary Physics, Vol: 64, Pages: 93-110, ISSN: 0010-7514
Atom interferometers measure quantum interference patterns in the wave functions of cold atoms that follow superpositions of different space-time trajectories. These can be sensitive to phase shifts induced by fundamental physics processes such as interactions with ultralight dark matter or the passage of gravitational waves. The capabilities of large-scale atom interferometers are illustrated by their estimated sensitivities to the possible interactions of ultralight dark matter with electrons and photons, and to gravitational waves in the frequency range around 1 Hz, intermediate between the peak sensitivities of the LIGO and LISA experiments. Atom interferometers can probe ultralight scalar couplings with much greater sensitivity than is currently available from probes of the Equivalence Principle. Their sensitivity to mid-frequency gravitational waves may open a window on mergers of masses intermediate between those discovered by the LIGO and Virgo experiments and the supermassive black holes present in the cores of galaxies, as well as fundamental physics processes in the early Universe such as first-order phase transitions and the evolution of networks of cosmic strings.
Tumasyan A, Adam W, Andrejkovic JW, et al., 2022, Search for new particles in an extended Higgs sector with four b quarks in the final state at √s=13 TeV, PHYSICS LETTERS B, Vol: 835, ISSN: 0370-2693
Tumasyan A, Adam W, Ambrogi F, et al., 2022, Nuclear modification of Y states in pPb collisions at √sNN = 5.02 TeV, Physics Letters B, Vol: 835, ISSN: 0370-2693
Production cross sections of Υ(1S), Υ(2S), and Υ(3S) states decaying into μ+μ− in proton-lead (pPb) collisions are reported using data collected by the CMS experiment at √sNN = 5.02 TeV. A comparison is made with corresponding cross sections obtained with pp data measured at the same collision energy and scaled by the Pb nucleus mass number. The nuclear modification factor for Υ(1S) is found to be RpPb(Υ(1S)) = 0.806±0.024 (stat)±0.059 (syst). Similar results for the excited states indicate a sequentialsuppression pattern, such that RpPb(Υ(1S)) > RpPb(Υ(2S)) > RpPb(Υ(3S)). The suppression of all states is much less pronounced in pPb than in PbPb collisions, and independent of transverse momentum pΥT and center-of-mass rapidity yΥCM of the individual Υ state in the studied range pΥT < 30 GeV/c and |yΥCM| <1.93. Models that incorporate final-state effects of bottomonia in pPb collisions are in better agreement with the data than those which only assume initial-state modifications.
Alonso I, Alpigiani C, Altschul B, et al., 2022, Cold atoms in space: community workshop summary and proposed road-map, EPJ QUANTUM TECHNOLOGY, Vol: 9, ISSN: 2662-4400
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- Citations: 10
Tumasyan A, Adam W, Andrejkovic JW, et al., 2022, Search for new particles in an extended Higgs sector with four b quarks in the final state at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.svg"><mml:msqrt><mml:mrow><mml:mi>s</mml:mi></mml:mrow></mml:msqrt><mml:mo linebreak="goodbreak" linebreakstyle="after">=</mml:mo><mml:mn>13</mml:mn><mml:mrow><mml:mspace width="0.20em" /><mml:mtext>TeV</mml:mtext></mml:mrow></mml:math>, Physics Letters B, Vol: 835, Pages: 137566-137566, ISSN: 0370-2693
Chatrchyan S, Khachatryan V, Sirunyan AM, et al., 2022, Searches for long-lived charged particles in pp collisions at √s = 7 and 8 TeV (vol 07, 122, 2013), JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
Tumasyan A, Adam W, Andrejkovic JW, et al., 2022, Evidence for WW/WZ vector boson scattering in the decay channelνqq produced in association with two jets in proton-proton collisionsat √s = 13 TeV, Physics Letters B, Vol: 834, Pages: 1-28, ISSN: 0370-2693
Evidence is reported for electroweak (EW) vector boson scattering in the decay channel νqq of twoweak vector bosons WV (V = W or Z), produced in association with two parton jets. The search usesa data set of proton-proton collisions at 13 TeV collected with the CMS detector during 2016–2018with an integrated luminosity of 138 fb−1. Events are selected requiring one lepton (electron or muon),moderate missing transverse momentum, two jets with a large pseudorapidity separation and a large dijetinvariant mass, and a signature consistent with the hadronic decay of a W/Z boson. The cross section iscomputed in a fiducial phase space defined at parton level requiring all parton transverse momentapT > 10 GeV and at least one pair of outgoing partons with invariant mass mqq > 100 GeV. The measuredand expected EW WV production cross sections are 1.90+0.53−0.46 pb and 2.23+0.08−0.11(scale) ± 0.05(PDF) pb,respectively, where PDF is the parton distribution function. The observed EW signal strength is μEW =0.85 ± 0.12 (stat)+0.19−0.17 (syst), corresponding to a signal significance of 4.4 standard deviations with 5.1expected, and it is measured keeping the quantum chromodynamics (QCD) associated diboson productionfixed to the standard model prediction. This is the first evidence of vector boson scattering in the νqqdecay channel at LHC. The simultaneous measurement of the EW and QCD associated diboson productionagrees with the standard model prediction.
Tumasyan A, Adam W, Andrejkovic JW, et al., 2022, Measurement of the Higgs boson width and evidence of its off-shell contributions to ZZ production, Nature Physics, Vol: 18, Pages: 1329-1334, ISSN: 1745-2473
Since the discovery of the Higgs boson in 2012, detailed studies of its properties have been ongoing. Besides its mass, its width—related to its lifetime—is an important parameter. One way to determine this quantity is to measure its off-shell production, where the Higgs boson mass is far away from its nominal value, and relating it to its on-shell production, where the mass is close to the nominal value. Here we report evidence for such off-shell contributions to the production cross-section of two Z bosons with data from the CMS experiment at the CERN Large Hadron Collider. We constrain the total rate of the off-shell Higgs boson contribution beyond the Z boson pair production threshold, relative to its standard model expectation, to the interval [0.0061, 2.0] at the 95% confidence level. The scenario with no off-shell contribution is excluded at a p-value of 0.0003 (3.6 standard deviations). We measure the width of the Higgs boson as ΓH=3.2+2.4−1.7MeV, in agreement with the standard model expectation of 4.1 MeV. In addition, we set constraints on anomalous Higgs boson couplings to W and Z boson pairs.
Tumasyan A, Adam W, Andrejkovic JW, et al., 2022, Search for a W' boson decaying to a vector-like quark and a top or bottom quark in the all-jets final state at root s=13 TeV, The Journal of High Energy Physics, Vol: 2022, Pages: 1-46, ISSN: 1029-8479
A search is presented for a heavy W′ boson resonance decaying to a B or T vector-like quark and a t or a b quark, respectively. The analysis is performed using proton-proton collisions collected with the CMS detector at the LHC. The data correspond to an integrated luminosity of 138 fb−1 at a center-of-mass energy of 13 TeV. Both decay channels result in a signature with a t quark, a Higgs or Z boson, and a b quark, each produced with a significant Lorentz boost. The all-hadronic decays of the Higgs or Z boson and of the t quark are selected using jet substructure techniques to reduce standard model backgrounds, resulting in a distinct three-jet W′ boson decay signature. No significant deviation in data with respect to the standard model background prediction is observed. Upper limits are set at 95% confidence level on the product of the W′ boson cross section and the final state branching fraction. A W′ boson with a mass below 3.1 TeV is excluded, given the benchmark model assumption of democratic branching fractions. In addition, limits are set based on generalizations of these assumptions. These are the most sensitive limits to date for this final state.
Tumasyan A, Adam W, Andrejkovic JW, et al., 2022, earch for a W′ boson decaying to a vector-like quark and a top or bottom quark in the all-jets final state at s√ = 13 TeV, The Journal of High Energy Physics, Vol: 2022, Pages: 1-46, ISSN: 1029-8479
A search is presented for a heavy W′ boson resonance decaying to a B or T vector-like quark and a t or a b quark, respectively. The analysis is performed using proton-proton collisions collected with the CMS detector at the LHC. The data correspond to an integrated luminosity of 138 fb−1 at a center-of-mass energy of 13 TeV. Both decay channels result in a signature with a t quark, a Higgs or Z boson, and a b quark, each produced with a significant Lorentz boost. The all-hadronic decays of the Higgs or Z boson and of the t quark are selected using jet substructure techniques to reduce standard model backgrounds, resulting in a distinct three-jet W′ boson decay signature. No significant deviation in data with respect to the standard model background prediction is observed. Upper limits are set at 95% confidence level on the product of the W′ boson cross section and the final state branching fraction. A W′ boson with a mass below 3.1 TeV is excluded, given the benchmark model assumption of democratic branching fractions. In addition, limits are set based on generalizations of these assumptions. These are the most sensitive limits to date for this final state.
Tumasyan A, Adam W, Andrejkovic JW, et al., 2022, Search for high-mass resonances decaying to a jet and a Lorentz-boosted resonance in proton-proton collisions at √<i>s</i>=13 TeV, Publisher: ELSEVIER
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- Citations: 1
Tumasyan A, Adam W, Andrejkovic JW, et al., 2022, Search for high-mass resonances decaying to a jet and aLorentz-boosted resonance in proton-proton collisions at √s = 13 TeV, Physics Letters B, Vol: 832, Pages: 1-24, ISSN: 0370-2693
A search is reported for high-mass hadronic resonances that decay to a parton and a Lorentz-boosted resonance, which in turn decays into a pair of partons. The search is based on data collected with the CMS detector at the LHC in proton-proton collisions at , corresponding to an integrated luminosity of 138. The boosted resonance is reconstructed as a single wide jet with substructure consistent with a two-body decay. The high-mass resonance is thus considered as a dijet system. The jet substructure information and the kinematic properties of cascade resonance decays are exploited to disentangle the signal from the large quantum chromodynamics multijet background. The dijet mass spectrum is analyzed for the presence of new high-mass resonances, and is found to be consistent with the standard model background predictions. Results are interpreted in a warped extra dimension model where the high-mass resonance is a Kaluza–Klein gluon, the boosted resonance is a radion, and the final state partons are all gluons. Limits on the production cross section are set as a function of the Kaluza–Klein gluon and radion masses. These limits exclude at 95% confidence level models with Kaluza–Klein gluon masses in the range 2.0 to 4.3 TeV and radion masses in the range 0.20 to 0.74 TeV. By exploring a novel experimental signature, the observed limits on the Kaluza–Klein gluon mass are extended by up to about 1 TeV compared to previous searches.
Tumasyan A, Adam W, Andrejkovic JW, et al., 2022, Search for Higgs boson pair production in the four b quark final state in proton-proton collisions at sqrt[s]=13 TeV, Physical Review Letters, Vol: 129, ISSN: 0031-9007
A search for pairs of Higgs bosons produced via gluon and vector boson fusion is presented, focusing on the four b quark final state. The data sample consists of proton-proton collisions at a center-of-mass energy of 13 TeV, collected with the CMS detector at the LHC, and corresponds to an integrated luminosity of 138 fb^{-1}. No deviation from the background-only hypothesis is observed. A 95% confidence level upper limit on the Higgs boson pair production cross section is observed at 3.9 times the standard model prediction for an expected value of 7.8. Constraints are also set on the modifiers of the Higgs field self-coupling, κ_{λ}, and of the coupling of two Higgs bosons to two vector bosons, κ_{2 V}. The observed (expected) allowed intervals at the 95% confidence level are -2.3<κ_{λ}<9.4 (-5.0<κ_{λ}<12.0) and -0.1<κ_{2 V}<2.2 (-0.4<κ_{2 V}<2.5). These are the most stringent observed constraints to date on the HH production cross section and on the κ_{2 V } coupling.
Tumasyan A, Adam W, Andrejkovic JW, et al., 2022, Strategies and performance of the CMS silicon tracker alignment during LHC Run 2, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment, Vol: 1037, ISSN: 0168-9002
The strategies for and the performance of the CMS silicon tracking system alignment during the 2015–2018 data-taking period of the LHC are described. The alignment procedures during and after data taking are explained. Alignment scenarios are also derived for use in the simulation of the detector response. Systematic effects, related to intrinsic symmetries of the alignment task or to external constraints, are discussed and illustrated for different scenarios.
Workman RL, Burkert VD, Crede V, et al., 2022, REVIEW OF PARTICLE PHYSICS, PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS, Vol: 2022, ISSN: 2050-3911
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- Citations: 111
Tumasyan A, Adam W, Andrejkovic JW, et al., 2022, Measurement of the Drell-Yan forward-backward asymmetry at high dilepton masses in proton-proton collisions at root s=13 TeV, The Journal of High Energy Physics, Vol: 2022, Pages: 1-58, ISSN: 1029-8479
A measurement of the forward-backward asymmetry of pairs of oppositely charged leptons (dimuons and dielectrons) produced by the Drell-Yan process in proton-proton collisions is presented. The data sample corresponds to an integrated luminosity of 138 fb−1 collected with the CMS detector at the LHC at a center-of-mass energy of 13 TeV. The asymmetry is measured as a function of lepton pair mass for masses larger than 170 GeV and compared with standard model predictions. An inclusive measurement across both channels and the full mass range yields an asymmetry of 0.612 ± 0.005 (stat) ± 0.007 (syst). As a test of lepton flavor universality, the difference between the dimuon and dielectron asymmetries is measured as well. No statistically significant deviations from standard model predictions are observed. The measurements are used to set limits on the presence of additional gauge bosons. For a Z′ boson in the sequential standard model the observed (expected) 95% confidence level lower limit on the Z′ mass is 4.4 TeV (3.7 TeV).
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