Journal Articles

Permanent URI for this collectionhttps://mro.massey.ac.nz/handle/10179/7915

Browse

Author: search.filters.author.D'Hondt JSubject: search.filters.subject.CMS

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    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.
  • Thumbnail Image
    Item
    Measurement of the charge ratio of atmospheric muons with the CMS detector
    (ELSEVIER SCIENCE BV, 1/01/2010) Khachatryan V; Sirunyan AM; Tumasyan A; Adam W; Bergauer T; Dragicevic M; Erö J; Fabjan C; Friedl M; Frühwirth R; Ghete VM; Hammer J; Hänsel S; Hoch M; Hörmann N; Hrubec J; Jeitler M; Kasieczka G; Kiesenhofer W; Krammer M; Liko D; Mikulec I; Pernicka M; Rohringer H; Schöfbeck R; Strauss J; Taurok A; Teischinger F; Waltenberger W; Walzel G; Widl E; Wulz CE; Mossolov V; Shumeiko N; Suarez Gonzalez J; Benucci L; Ceard L; De Wolf EA; Hashemi M; Janssen X; Maes T; Mucibello L; Ochesanu S; Roland B; Rougny R; Selvaggi M; Van Haevermaet H; Van Mechelen P; Van Remortel N; Adler V; Beauceron S; Blyweert S; D'Hondt J; Devroede O; Kalogeropoulos A; Maes J; Maes M; Tavernier S; Van Doninck W; Van Mulders P; Villella I; Chabert EC; Charaf O; Clerbaux B; De Lentdecker G; Dero V; Gay APR; Hammad GH; Marage PE; Vander Velde C; Vanlaer P; Wickens J; Costantini S; Grunewald M; Klein B; Marinov A; Ryckbosch D; Thyssen F; Tytgat M; Vanelderen L; Verwilligen P; Walsh S; Zaganidis N; Basegmez S; Bruno G; Caudron J; De Favereau De Jeneret J; Delaere C; Demin P; Favart D; Giammanco A; Grégoire G; Hollar J; Lemaitre V; Militaru O; Ovyn S; Pagano D; Pin A; Piotrzkowski K; Quertenmont L
    We present a measurement of the ratio of positive to negative muon fluxes from cosmic ray interactions in the atmosphere, using data collected by the CMS detector both at ground level and in the underground experimental cavern at the CERN LHC. Muons were detected in the momentum range from 5 GeV/. c to 1 TeV/. c. The surface flux ratio is measured to be 1.2766±0.0032(stat.)±0.0032(syst.), independent of the muon momentum, below 100 GeV/. c. This is the most precise measurement to date. At higher momenta the data are consistent with an increase of the charge ratio, in agreement with cosmic ray shower models and compatible with previous measurements by deep-underground experiments. © 2010.