Browsing by Author "Tumasyan, A."
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Measurements of the Higgs boson production cross section and couplings in the W boson pair decay channel in proton-proton collisions at √s = 13 TeV
Tumasyan, A.; Işıldak, Bora (Springer, 2023-07-26)Production 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 13 TeV . The analysis targets Higgs bosons produced via gluon ... -
Measurements of the pp → W±γγ and pp → Zγγ cross sections at √s = 13 TeV and limits on anomalous quartic gauge couplings
The cross section for W or Z boson production in association with two photons is measured in proton-proton collisions at a centre-of-mass energy of 13 TeV. The data set corresponds to an integrated luminosity of 137 fb−1 ... -
A new calibration method for charm jet identification validated with proton-proton collision events at √s = 13 TeV
Tumasyan, A.; Işıldak, Bora (IOP Publishing, 2022-03-17)Many measurements at the LHC require efficient identification of heavy-flavour jets, i.e. jets originating from bottom (b) or charm (c) quarks. An overview of the algorithms used to identify c jets is described and a novel ... -
Nuclear modification of Y states in pPb collisions at √sNN = 5.02 TeV
Tumasyan, A.; Işıldak, Bora (Elsevier, 2022-12-10)Production cross sections of [Formula presented], [Formula presented], and [Formula presented] states decaying into [Formula presented] in proton-lead (pPb) collisions are reported using data collected by the CMS experiment ... -
Observation of B0 → ψ (2S)K0Sπ+π− and B0s → ψ (2S)K0S decays
Tumasyan, A.; Işıldak, Bora (Springer, 2022-05-31) -
Observation of B0 s mesons and measurement of the B0 s /B+ yield ratio in PbPb collisions at √snn = 5.02 TeV
Tumasyan, A.; Işıldak, Bora (Elsevier, 2022-06-10)The Bs 0 and B+ production yields are measured in PbPb collisions at a center-of-mass energy per nucleon pair of 5.02 TeV. The data sample, collected with the CMS detector at the LHC, corresponds to an integrated luminosity ... -
Observation of same-sign WW production from double parton scattering in proton-proton collisions at √s=13 TeV
Tumasyan, A.; Işıldak, Bora (American Physical Society, 2023-09-01)The first observation of the production of Formula Presented bosons from double parton scattering processes using same-sign electron-muon and dimuon events in proton-proton collisions is reported. The data sample corresponds ... -
Observation of the Bc+ meson in Pb-Pb and pp collisions at √s NN = 5.02 TeV and measurement of its nuclear modification factor
Tumasyan, A.; Işıldak, Bora (American Physical Society, 2022-06-21)The Bc+ meson is observed for the first time in heavy ion collisions. Data from the CMS detector are used to study the production of the Bc+ meson in lead-lead (Pb-Pb) and proton-proton (pp) collisions at a center-of-mass ... -
Observation of tW production in the single-lepton channel in pp collisions at s√ = 13 TeV
Tumasyan, A.; Işıldak, Bora (Springer, 2021-11-11)A measurement of the cross section of the associated production of a single top quark and a W boson in final states with a muon or electron and jets in proton-proton collisions at s = 13 TeV is presented. The data correspond ... -
Performance of the local reconstruction algorithms for the CMS hadron calorimeter with Run 2 data
Tumasyan, A.; Işıldak, Bora (IOP Publishing, 2023-11)A description is presented of the algorithms used to reconstruct energy deposited in the CMS hadron calorimeter during Run 2 (2015-2018) of the LHC. During Run 2, the characteristic bunch-crossing spacing for proton-proton ... -
Precision measurement of the W boson decay branching fractions in proton-proton collisions at √s = 13 TeV
Tumasyan, A.; Işıldak, Bora (American Physical Society, 2022-04-26)The leptonic and inclusive hadronic decay branching fractions of the W boson are measured using proton-proton collision data collected at s=13 TeV by the CMS experiment at the CERN LHC, corresponding to an integrated ... -
Probing charm quark dynamics via multiparticle correlations in Pb-Pb collisions at √s NN = 5.02 TeV
Tumasyan, A.; Işıldak, Bora (American Physical Society, 2022-07-05)Multiparticle azimuthal correlations of prompt D0 mesons are measured in Pb-Pb collisions at a nucleon-nucleon center-of-mass energy of sNN=5.02 TeV. For the first time, a four-particle cumulant method is used to extract ... -
Probing heavy majorana neutrinos and the weinberg operator through vector boson fusion processes in proton-proton collisions at √s = 13 TeV
Tumasyan, A.; Işıldak, Bora (American Physical Society, 2023-07-06)The first search exploiting the vector boson fusion process to probe heavy Majorana neutrinos and the Weinberg operator at the LHC is presented. The search is performed in the same-sign dimuon final state using a proton-proton ... -
Publisher Correction: Observation of triple J/ψ meson production in proton-proton collisions
Tumasyan, A.; Işıldak, Bora (Nature Research, 2023-12-12)Correction to: Nature Physics, published online 19 January 2023. In the version of the article initially published, the second affiliation of T. Elkafrawy was incorrect and is now shown as Ain Shams University, Cairo, Egypt ... -
Reconstruction of decays to merged photons using end-to-end deep learning with domain continuation in the CMS detector
Tumasyan, A.; Işıldak, Bora (American Physical Society, 2023-09-05)A novel technique based on machine learning is introduced to reconstruct the decays of highly Lorentz-boosted particles. Using an end-to-end deep learning strategy, the technique bypasses existing rule-based particle ... -
Search for a charged Higgs boson decaying into a heavy neutral Higgs boson and a W boson in proton-proton collisions at √s=13 TeV
Tumasyan, A.; Işıldak, Bora (Springer, 2023-09-06)A search for a charged Higgs boson H-+/- decaying into a heavy neutral Higgs boson H and a W boson is presented. The analysis targets the H decay into a pair of tau leptons with at least one of them decaying hadronically ... -
Search for a heavy composite Majorana neutrino in events with dilepton signatures from proton-proton collisions at √s = 13 TeV
Tumasyan, A.; Işıldak, Bora (Elsevier, 2023-08-10)Results are presented of a search for a heavy Majorana neutrino [Formula presented] decaying into two same-flavor leptons ℓ (electrons or muons) and a quark-pair jet. A model is considered in which the [Formula presented] ... -
Search for a heavy Higgs boson decaying into two lighter Higgs bosons in the τ τbb final state at 13 TeV
Tumasyan, A.; Işıldak, Bora (Springer, 2021-11-09)A search for a heavy Higgs boson H decaying into the observed Higgs boson h with a mass of 125 GeV and another Higgs boson hS is presented. The h and hS bosons are required to decay into a pair of tau leptons and a pair ... -
Search for a heavy resonance decaying into a top quark and a W boson in the lepton+jets final state at s√ = 13 TeV
Tumasyan, A.; Işıldak, Bora (Springer, 2022-04-08)A search for a heavy resonance decaying into a top quark and a W boson in proton-proton collisions at s = 13 TeV is presented. The data analyzed were recorded with the CMS detector at the LHC and correspond to an integrated ... -
Search for a right-handed W boson and a heavy neutrino in proton-proton collisions at s√ = 13 TeV
Tumasyan, A.; Işıldak, Bora (Springer, 2022-04-08)A search is presented for a right-handed W boson (WR) and a heavy neutrino (N), in a final state consisting of two same-flavor leptons (ee or μμ) and two quarks. The search is performed with the CMS experiment at the CERN ...
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