Browsing by Author "Hayrapetyan A"

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    Measurement of the polarizations of prompt and non-prompt [Formula presented] and ψ(2S) mesons produced in pp collisions at s=13TeV
    (Elsevier B.V., 2024-10-04) Hayrapetyan A; Tumasyan A; Adam W; Andrejkovic JW; Bergauer T; Chatterjee S; Damanakis K; Dragicevic M; Hussain PS; Jeitler M; Krammer N; Li A; Liko D; Mikulec I; Schieck J; Schöfbeck R; Schwarz D; Sonawane M; Templ S; Waltenberger W; Wulz CE; Darwish MR; Janssen T; Van Laer T; Van Mechelen P; Breugelmans N; D'Hondt J; Dansana S; De Moor A; Delcourt M; Heyen F; Lowette S; Makarenko I; Müller D; Tavernier S; Tytgat M; Van Onsem GP; Van Putte S; Vannerom D; Bilin B; Clerbaux B; Das AK; De Lentdecker G; Evard H; Favart L; Gianneios P; Jaramillo J; Khalilzadeh A; Khan FA; Lee K; Mahdavikhorrami M; Malara A; Paredes S; Shahzad MA; Thomas L; Vanden Bemden M; Vander Velde C; Vanlaer P; De Coen M; Dobur D; Gokbulut G; Hong Y; Knolle J; Lambrecht L; Marckx D; Mota Amarilo K; Samalan A; Skovpen K; Van Den Bossche N; van der Linden J; Wezenbeek L; Benecke A; Bethani A; Bruno G; Caputo C; De Favereau De Jeneret J; Delaere C; Donertas IS; Giammanco A; Guzel AO; Jain S; Lemaitre V; Lidrych J; Mastrapasqua P; Tran TT; Wertz S; Alves GA; Alves Gallo Pereira M; Coelho E; Correia Silva G; Hensel C; Menezes De Oliveira T; Mora Herrera C; Moraes A; Rebello Teles P; Soeiro M; Vilela Pereira A; Aldá Júnior WL; Barroso Ferreira Filho M; Brandao Malbouisson H; Doser M
    The polarizations of prompt and non-prompt [Formula presented] and ψ(2S) mesons are measured in proton-proton collisions at s=13 TeV, using data samples collected by the CMS experiment in 2017 and 2018, corresponding to a total integrated luminosity of 103.3fb−1. Based on the analysis of the dimuon decay angular distributions in the helicity frame, the polar anisotropy, λϑ, is measured as a function of the transverse momentum, pT, of the charmonium states, in the 25–120 and 20–100 GeV ranges for the [Formula presented] and ψ(2S), respectively. The non-prompt polarizations agree with predictions based on the hypothesis that, for pT≳25GeV, the non-prompt [Formula presented] and ψ(2S) are predominantly produced in two-body B meson decays. The prompt results clearly exclude strong transverse polarizations, even for pT exceeding 30 times the [Formula presented] mass, where λϑ tends to an asymptotic value around 0.3. Taken together with previous measurements, by CMS and LHCb at s=7 TeV, the prompt polarizations show a significant variation with pT, at low pT.
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    Search for a resonance decaying to a W boson and a photon in proton-proton collisions at s = 13 TeV using leptonic W boson decays
    (Springer Nature, 2024-09-25) Hayrapetyan A; Tumasyan A; Adam W; Andrejkovic JW; Bergauer T; Chatterjee S; Damanakis K; Dragicevic M; Hussain PS; Jeitler M; Krammer N; Li A; Liko D; Mikulec I; Schieck J; Schöfbeck R; Schwarz D; Sonawane M; Templ S; Waltenberger W; Wulz CE; Janssen T; Van Laer T; Van Mechelen P; Breugelmans N; D’Hondt J; Dansana S; De Moor A; Delcourt M; Heyen F; Lowette S; Makarenko I; Müller D; Tavernier S; Tytgat M; Van Onsem GP; Van Putte S; Vannerom D; Bilin B; Clerbaux B; Das AK; De Lentdecker G; Evard H; Favart L; Gianneios P; Jaramillo J; Khalilzadeh A; Khan FA; Lee K; Mahdavikhorrami M; Malara A; Paredes S; Shahzad MA; Thomas L; Vanden Bemden M; Vander Velde C; Vanlaer P; De Coen M; Dobur D; Gokbulut G; Hong Y; Knolle J; Lambrecht L; Marckx D; Mota Amarilo K; Samalan A; Skovpen K; Van Den Bossche N; van der Linden J; Wezenbeek L; Benecke A; Bethani A; Bruno G; Caputo C; De Favereau De Jeneret J; Delaere C; Donertas IS; Giammanco A; Guzel AO; Jain S; Lemaitre V; Lidrych J; Mastrapasqua P; Tran TT; Wertz S; Alves GA; Alves Gallo Pereira M; Coelho E; Correia Silva G; Hensel C; Menezes De Oliveira T; Mora Herrera C; Moraes A; Rebello Teles P; Soeiro M; Vilela Pereira A; Aldá Júnior WL; Barroso Ferreira Filho M; Brandao Malbouisson H; Carvalho W
    A search for a new charged particle X with mass between 0.3 and 2.0 TeV decaying to a W boson and a photon is presented, using proton-proton collision data at a center-of-mass energy of 13 TeV, collected by the CMS experiment and corresponding to an integrated luminosity of 138 fb−1. Particle X has electric charge ±1 and is assumed to have spin 0. The search is performed using the electron and muon decays of the W boson. No significant excess above the predicted background is observed. The upper limit at 95% confidence level on the product of the production cross section of the X and its branching fraction to a W boson and a photon is found to be 94 (137) fb for a 0.3 TeV resonance and 0.75 (0.81) fb for a 2.0 TeV resonance, for an X width-to-mass ratio of 0.01% (5%). This search presents the most stringent constraints to date on the existence of such resonances across the probed mass range. A statistical combination with an earlier study based on the hadronic decay mode of the W boson is also performed, and the upper limit at 95% confidence level for a 2.0 TeV resonance is reduced to 0.50 (0.63) fb for an X width-to-mass ratio of 0.01% (5%).