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Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
Azimuthal correlations in Z +jets events in proton-proton collisions at s=13TeV.
, Eur Phys J C Part Fields, Vol: 83, ISSN: 1434-6044The 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 articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
Measurements of the Higgs boson production cross section and couplings in the W boson pair decay channel in proton-proton collisions at s=13TeV.
, Eur Phys J C Part Fields, Vol: 83, ISSN: 1434-6044Production cross sections of the standard model Higgs boson decaying to a pair of W bosons are measured in proton-proton collisions at a center-of-mass energy of 13TeV. The analysis targets Higgs bosons produced via gluon fusion, vector boson fusion, and in association with a W or Z boson. Candidate events are required to have at least two charged leptons and moderate missing transverse momentum, targeting events with at least one leptonically decaying W boson originating from the Higgs boson. Results are presented in the form of inclusive and differential cross sections in the simplified template cross section framework, as well as couplings of the Higgs boson to vector bosons and fermions. The data set collected by the CMS detector during 2016-2018 is used, corresponding to an integrated luminosity of 138fb-1. The signal strength modifier μ, defined as the ratio of the observed production rate in a given decay channel to the standard model expectation, is measured to be μ=0.95-0.09+0.10. All results are found to be compatible with the standard model within the uncertainties.
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Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
Measurement of the differential tt¯ production cross section as a function of the jet mass and extraction of the top quark mass in hadronic decays of boosted top quarks.
, Eur Phys J C Part Fields, Vol: 83, ISSN: 1434-6044A measurement of the jet mass distribution in hadronic decays of Lorentz-boosted top quarks is presented. The measurement is performed in the lepton + jets channel of top quark pair production (tt¯) events, where the lepton is an electron or muon. The products of the hadronic top quark decay are reconstructed using a single large-radius jet with transverse momentum greater than 400GeV. The data were collected with the CMS detector at the LHC in proton-proton collisions and correspond to an integrated luminosity of 138fb-1. The differential tt¯ production cross section as a function of the jet mass is unfolded to the particle level and is used to extract the top quark mass. The jet mass scale is calibrated using the hadronic W boson decay within the large-radius jet. The uncertainties in the modelling of the final state radiation are reduced by studying angular correlations in the jet substructure. These developments lead to a significant increase in precision, and a top quark mass of 173.06±0.84GeV.
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Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
Search for light Higgs bosons from supersymmetric cascade decays in pp collisions at s=13TeV.
, Eur Phys J C Part Fields, Vol: 83, ISSN: 1434-6044A search is reported for pairs of light Higgs bosons (H1) produced in supersymmetric cascade decays in final states with small missing transverse momentum. A data set of LHC pp collisions collected with the CMS detector at s=13TeV and corresponding to an integrated luminosity of 138fb-1 is used. The search targets events where both H1 bosons decay into pairs that are reconstructed as large-radius jets using substructure techniques. No evidence is found for an excess of events beyond the background expectations of the standard model (SM). Results from the search are interpreted in the next-to-minimal supersymmetric extension of the SM, where a "singlino" of small mass leads to squark and gluino cascade decays that can predominantly end in a highly Lorentz-boosted singlet-like H1 and a singlino-like neutralino of small transverse momentum. Upper limits are set on the product of the squark or gluino pair production cross section and the square of the branching fraction of the H1 in a benchmark model containing almost mass-degenerate gluinos and light-flavour squarks. Under the assumption of an SM-like branching fraction, H1 bosons with masses in the range 40-120GeV arising from the decays of squarks or gluinos with a mass of 1200-2500GeV are excluded at 95% confidence level.
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Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
CMS pythia 8 colour reconnection tunes based on underlying-event data.
, Eur Phys J C Part Fields, Vol: 83, ISSN: 1434-6044New sets of parameter tunes for two of the colour reconnection models, quantum chromodynamics-inspired and gluon-move, implemented in the pythia 8 event generator, are obtained based on the default CMS pythia 8 underlying-event tune, CP5. Measurements sensitive to the underlying event performed by the CMS experiment at centre-of-mass energies s=7 and 13TeV, and by the CDF experiment at 1.96TeV are used to constrain the parameters of colour reconnection models and multiple-parton interactions simultaneously. The new colour reconnection tunes are compared with various measurements at 1.96, 7, 8, and 13TeV including measurements of the underlying-event, strange-particle multiplicities, jet substructure observables, jet shapes, and colour flow in top quark pair (tt¯) events. The new tunes are also used to estimate the uncertainty related to colour reconnection modelling in the top quark mass measurement using the decay products of tt¯ events in the semileptonic channel at 13TeV.
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Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2023,
Measurement of the mass dependence of the transverse momentum of lepton pairs in Drell-Yan production in proton-proton collisions at s=13TeV.
, Eur Phys J C Part Fields, Vol: 83, ISSN: 1434-6044The double differential cross sections of the Drell-Yan lepton pair (ℓ+ℓ-, dielectron or dimuon) production are measured as functions of the invariant mass mℓℓ, transverse momentum pT(ℓℓ), and φη∗. The φη∗ observable, derived from angular measurements of the leptons and highly correlated with pT(ℓℓ), is used to probe the low-pT(ℓℓ) region in a complementary way. Dilepton masses up to 1TeV are investigated. Additionally, a measurement is performed requiring at least one jet in the final state. To benefit from partial cancellation of the systematic uncertainty, the ratios of the differential cross sections for various mℓℓ ranges to those in the Z mass peak interval are presented. The collected data correspond to an integrated luminosity of 36.3fb-1 of proton-proton collisions recorded with the CMS detector at the LHC at a centre-of-mass energy of 13TeV. Measurements are compared with predictions based on perturbative quantum chromodynamics, including soft-gluon resummation.
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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 s=13TeV.
, Eur Phys J C Part Fields, Vol: 83, ISSN: 1434-6044Multijet events at large transverse momentum (pT) are measured at s=13TeV using data recorded with the CMS detector at the LHC, corresponding to an integrated luminosity of 36.3fb-1. The multiplicity of jets with pT>50GeV that are produced in association with a high-pT dijet system is measured in various ranges of the pT of the jet with the highest transverse momentum and as a function of the azimuthal angle difference Δϕ1,2 between the two highest pT jets in the dijet system. The differential production cross sections are measured as a function of the transverse momenta of the four highest pT jets. The measurements are compared with leading and next-to-leading order matrix element calculations supplemented with simulations of parton shower, hadronization, and multiparton interactions. In addition, the measurements are compared with next-to-leading order matrix element calculations combined with transverse-momentum dependent parton densities and transverse-momentum dependent parton shower.
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Journal articleTumasyan 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: 0370-2693Production 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.
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Journal articleTumasyan 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 -
Journal articleTumasyan A, Adam W, Andrejkovic JW, et al., 2022,
Addendum: Measurement and QCD analysis of double-differential inclusive jet cross sections in proton-proton collisions at √s=13 TeV
, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479 -
Journal articleTumasyan A, Adam W, Bergauer T, et al., 2022,
Measurements of the associated production of a W boson and a charm quark in proton-proton collisions at √<i>s</i>=8TeV
, EUROPEAN PHYSICAL JOURNAL C, Vol: 82, ISSN: 1434-6044- Author Web Link
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- Citations: 5
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Journal articleAlonso 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- Author Web Link
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- Citations: 10
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Journal articleTumasyan 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 -
Journal articleApple SM, Kenyon SP, Barke S, et al., 2022,
Measurement of stray electric fields in a capacitive inertial sensor using contactless test-mass charge modulation
, PHYSICAL REVIEW D, Vol: 106, ISSN: 2470-0010- Author Web Link
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- Citations: 1
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Journal articleChatrchyan 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 -
Journal articleBogomilov M, Tsenov R, Vankova-Kirilova G, et al., 2022,
Multiple Coulomb scattering of muons in lithium hydride
, Physical Review D: Particles, Fields, Gravitation and Cosmology, Vol: 106, ISSN: 1550-2368Multiple Coulomb scattering (MCS) is a well-known phenomenon occurring when charged particlestraverse materials. Measurements of muons traversing low Z materials made in the MuScat experimentshowed that theoretical models and simulation codes, such as GEANT4 (v7.0), over-estimated the scattering.The Muon Ionization Cooling Experiment (MICE) measured the cooling of a muon beam traversing aliquid hydrogen or lithium hydride (LiH) energy absorber as part of a programme to develop muonaccelerator facilities, such as a neutrino factory or a muon collider. The energy loss and MCS that occur inthe absorber material are competing effects that alter the performance of the cooling channel. Thereforemeasurements of MCS are required in order to validate the simulations used to predict the coolingperformance in future accelerator facilities. We report measurements made in the MICE apparatus of MCSusing a LiH absorber and muons within the momentum range 160 to 245 MeV=c. The measured RMSscattering width is about 9% smaller than that predicted by the approximate formula proposed by theParticle Data Group, but within the latter’s stated uncertainty. Data at 172, 200 and 240 MeV=c arecompared to the GEANT4 (v9.6) default scattering model. These measurements show agreement with thismore recent GEANT4 (v9.6) version over the range of incident muon momenta.
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Journal articleTumasyan 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: 0370-2693Evidence 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.
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Journal articleAkerib DS, Alsum S, Araujo HM, et al., 2022,
Fast and flexible analysis of direct dark matter search data with machine learning
, PHYSICAL REVIEW D, Vol: 106, ISSN: 2470-0010- Author Web Link
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- Citations: 1
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Journal articleTumasyan 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: 1745-2473Since 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.
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Journal articleTouboul P, Metris G, Rodrigues M, et al., 2022,
Result of the MICROSCOPE weak equivalence principle test
, CLASSICAL AND QUANTUM GRAVITY, Vol: 39, ISSN: 0264-9381- Author Web Link
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- Citations: 13
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Journal articleAbe K, Akhlaq N, Akutsu R, et al., 2022,
Scintillator ageing of the T2K near detectors fro 2010 to 2021
, Journal of Instrumentation, Vol: 17, Pages: 1-36, ISSN: 1748-0221The T2K experiment widely uses plastic scintillator as a target for neutrino interactions and an active medium for the measurement of charged particles produced in neutrino interactions at its near detector complex. Over 10 years of operation the measured light yield recorded by the scintillator based subsystems has been observed to degrade by 0.9–2.2% per year. Extrapolation of the degradation rate through to 2040 indicates the recorded light yield should remain above the lower threshold used by the current reconstruction algorithms for all subsystems. This will allow the near detectors to continue contributing to important physics measurements during the T2K-II and Hyper-Kamiokande eras. Additionally, work to disentangle the degradation of the plastic scintillator and wavelength shifting fibres shows that the reduction in light yield can be attributed to the ageing of the plastic scintillator. The long component of the attenuation length of the wavelength shifting fibres was observed to degrade by 1.3–5.4% per year, while the short component of the attenuation length did not show any conclusive degradation.
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Journal articleAbud AA, Abi B, Acciarri R, et al., 2022,
Separation of track- and shower-like energy deposits in ProtoDUNE-SP using a convolutional neural network
, European Physical Journal C: Particles and Fields, Vol: 82, Pages: 1-19, ISSN: 1124-1861Liquid argon time projection chamber detector technology provides high spatial and calorimetric resolutions on the charged particles traversing liquid argon. As a result, the technology has been used in a number of recent neutrino experiments, and is the technology of choice for the Deep Underground Neutrino Experiment (DUNE). In order to perform high precision measurements of neutrinos in the detector, final state particles need to be effectively identified, and their energy accurately reconstructed. This article proposes an algorithm based on a convolutional neural network to perform the classification of energy deposits and reconstructed particles as track-like or arising from electromagnetic cascades. Results from testing the algorithm on experimental data from ProtoDUNE-SP, a prototype of the DUNE far detector, are presented. The network identifies track- and shower-like particles, as well as Michel electrons, with high efficiency. The performance of the algorithm is consistent between experimental data and simulation.
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Journal articleMatsumoto R, Abe K, Hayato Y, et al., 2022,
Search for proton decay via p -> mu(+) K-0 in 0.37 megaton-years exposure of Super-Kamiokande
, Physical Review D: Particles, Fields, Gravitation and Cosmology, Vol: 106, Pages: 1-13, ISSN: 1550-2368We searched for proton decay via p→μ+K0 in 0.37 Mton⋅years of data collected between 1996 and 2018 from the Super-Kamiokande water Cherenkov experiment. The selection criteria were defined separately for K0S and K0L channels. No significant event excess has been observed. As a result of this analysis, which extends the previous search by an additional 0.2 Mton⋅years of exposure and uses an improved event reconstruction, we set a lower limit of 3.6×1033 years on the proton lifetime.
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Journal articleArmano M, Audley H, Baird J, et al., 2022,
Sensor noise in LISA Pathfinder: An extensive in-flight review of the angular and longitudinal interferometric measurement system
, Physical Review D: Particles, Fields, Gravitation and Cosmology, Vol: 106, Pages: 1-34, ISSN: 1550-2368In a previous article [1], we have reported on the first subpicometer interferometer flown in space as part of ESA’s LISA Pathfinder mission, and have shown the residual sensor noise to be on the level of 32.0+2.4−1.7 fm/√Hz. This review provides a deeper and more complete overview of the full system and its interferometric mission performance under varying operational conditions, allowing a much more detailed view on the noise model. We also include the optical measurements of rotations through differential wave front sensing (DWS), which reached a sensitivity of as good as 100 prad/√Hz. We present more evidence for the long-term stability of the interferometric performance and components. This proves a solid foundation for future interferometry in space such as the LISA mission.
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Journal articleMori M, Abe K, Hayato Y, et al., 2022,
Searching for Supernova Bursts in Super-Kamiokande IV
, ASTROPHYSICAL JOURNAL, Vol: 938, ISSN: 0004-637X- Author Web Link
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- Citations: 1
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Journal articleAbe K, Haga Y, Hayato Y, et al., 2022,
Neutron tagging following atmospheric neutrino events in a water Cherenkov detector
, JOURNAL OF INSTRUMENTATION, Vol: 17, ISSN: 1748-0221- Author Web Link
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- Citations: 1
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Journal articleTouboul P, Métris G, Rodrigues M, et al., 2022,
MICROSCOPE mission: final results of the test of the equivalence principle
, Physical Review Letters, Vol: 129, ISSN: 0031-9007The MICROSCOPE mission was designed to test the weak equivalence principle (WEP), stating the equality between the inertial and the gravitational masses, with a precision of 10^{-15} in terms of the Eötvös ratio η. Its experimental test consisted of comparing the accelerations undergone by two collocated test masses of different compositions as they orbited the Earth, by measuring the electrostatic forces required to keep them in equilibrium. This was done with ultrasensitive differential electrostatic accelerometers onboard a drag-free satellite. The mission lasted two and a half years, cumulating five months worth of science free-fall data, two-thirds with a pair of test masses of different compositions-titanium and platinum alloys-and the last third with a reference pair of test masses of the same composition-platinum. We summarize the data analysis, with an emphasis on the characterization of the systematic uncertainties due to thermal instabilities and on the correction of short-lived events which could mimic a WEP violation signal. We found no violation of the WEP, with the Eötvös parameter of the titanium and platinum pair constrained to η(Ti,Pt)=[-1.5±2.3(stat)±1.5(syst)]×10^{-15} at 1σ in statistical errors.
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Journal articleTumasyan 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: 1029-8479A 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.
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Journal articleTumasyan 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: 1029-8479A 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.
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Journal articleArmano M, Audley H, Baird J, et al., 2022,
Transient acceleration events in LISA Pathfinder data: Properties and possible physical origin
, PHYSICAL REVIEW D, Vol: 106, ISSN: 2470-0010
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