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| 題名: | Study of W boson production in PbPb and pp collisions at sNN=2.76 TeV |
| 作者: | 余欣珊;Chatrchyan, S.;Wagner, P.;Waltenberger, W.;Luyckx, S.;Roland, B.;Blyweert, S.;Van Onsem, G.P.;Vanelderen, L.;Giammanco, A.;Hammad, G.H.;Sznajder, A.;Mercadante, P.G.;Petkov, P.;Asawatangtrakuldee, C.;Zou, W.;Fedi, G.;Broutin, C.;Schael, S.;Heidemann, C.;Sauerland, P.;Schleper, P.;Seidel, M.;Beni, N.;Molnar, J.;Karancsi, J.;Nishu, N.;Dutta, S.;Kumar, V.;Aziz, T.;Nuzzo, S.;Fasanella, D.;Frosali, S.;Lariccia, P.;Lucaroni, A.;Cavallari, F.;Meridiani, P.;Argiro, S.;Kim, D.H.;Park, H.;Kim, T.J.;Choi, Y.K.;Asghar, M.I.;Szleper, M.;Ferreira Parracho, P.G.;Shmatov, S.;Uvarov, L.;Savrin, V.;Dremin, I.;Dupont-Sagorin, N.;Mozer, M.U.;Rodrigues Antunes, J.;Sekmen, S.;Simon, M.;Sphicas, P.;Deiters, K.;Renker, D.;Tauscher, L.;Snoek, H.;Yu, S.S.;Chao, Y.;Wang, M.;Kaya, O.;Heath, G.P.;Cockerill, D.J.A.;Chadwick, M.;Sperka, D.;Heintz, U.;Conway, R.;Dolen, J.;Clare, R.;Giordano, F.;Cerati, G.B.;Holzner, A.;Sudano, E.;Drell, B.R.;Edelmaier, C.J.;Albrow, M.;Bhat, P.C.;Uplegger, L.;Kim, B.;Korytov, A.;Adams, T.;Bochenek, J.;Hu, G.;Gronberg, J.;Dutta, V.;Singovsky, A.;Lazo-Flores, J.;Snow, G.R.;Wood, D.;Kolb, J.;Luo, W.;Hill, C.;Lopez, A.;De Mattia, M.;Guragain, S.;Ecklund, K.M.;Toback, D.;Lin, C.;Belknap, D. |
| 貢獻者: | 理學院物理學系 |
| 關鍵詞: | CMS;Exact sciences and technology;Heavy-ions;Nuclear physics;Physics;The physics of elementary particles and fields;W bosons |
| 日期: | 2012-08-29 |
| 上傳時間: | 2026-04-23 14:35:55 (UTC+8) |
| 出版者: | Kidlington: Elsevier B.V |
| 摘要: | 摘要： A measurement is presented of W-boson production in PbPb collisions carried out at a nucleon–nucleon (NN) centre-of-mass energy sNN of 2.76 TeV at the LHC using the CMS detector. In data corresponding to an integrated luminosity of 7.3 μb−1, the number of W→μνμ decays is extracted in the region of muon pseudorapidity |ημ|<2.1 and transverse momentum pTμ>25 GeV/c. Yields of muons found per unit of pseudorapidity correspond to (159±10(stat.)±12(syst.))×10−8W+ and (154±10(stat.)±12(syst.))×10−8W− bosons per minimum-bias PbPb collision. The dependence of W production on the centrality of PbPb collisions is consistent with a scaling of the yield by the number of incoherent NN collisions. The yield of W bosons is also studied in a sample of pp interactions at s=2.76 TeV corresponding to an integrated luminosity of 231 nb−1. The individual W+ and W− yields in PbPb and pp collisions are found to agree, once the neutron and proton content in Pb nuclei is taken into account. Likewise, the difference observed in the dependence of the positive and negative muon production on pseudorapidity is consistent with next-to-leading-order perturbative QCD calculations.
出版者： Kidlington: Elsevier B.V
出版日期： 2012-08-29
出處： Physics letters. B, 2012-08, Vol.715 (1-3), p.66-87
資源來源： Elsevier ScienceDirect Journals
版權： 2012 CERN
版權： 2015 INIST-CNRS
識別號： ISSN: 0370-2693
識別號： EISSN: 1873-2445
識別號： DOI: 10.1016/j.physletb.2012.07.025
識別號： CODEN: PYLBAJ |
| 顯示於類別: | [物理學系] 期刊論文
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