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Study of W boson production in PbPb and pp collisions at sNN=2.76 TeV

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 715:1-3 (2012) 66-87

Authors:

S Chatrchyan, V Khachatryan, AM Sirunyan, A Tumasyan, W Adam, T Bergauer, M Dragicevic, J Erö, C Fabjan, M Friedl, R Frühwirth, VM Ghete, J Hammer, N Hörmann, J Hrubec, M Jeitler, W Kiesenhofer, V Knünz, M Krammer, D Liko, I Mikulec, M Pernicka, B Rahbaran, C Rohringer, H Rohringer, R Schöfbeck, J Strauss, A Taurok, P Wagner, W Waltenberger, G Walzel, E Widl, CE Wulz, V Mossolov, N Shumeiko, J Suarez Gonzalez, S Bansal, T Cornelis, EA De Wolf, X Janssen, S Luyckx, T Maes, L Mucibello, S Ochesanu, B Roland, R Rougny, M Selvaggi, Z Staykova, H Van Haevermaet, P Van Mechelen, N Van Remortel, A Van Spilbeeck, F Blekman, S Blyweert, J D'Hondt, R Gonzalez Suarez, A Kalogeropoulos, M Maes, A Olbrechts, W Van Doninck, P Van Mulders, GP Van Onsem, I Villella, O Charaf, B Clerbaux, G De Lentdecker, V Dero, APR Gay, T Hreus, A Léonard, PE Marage, T Reis, L Thomas, C Vander Velde, P Vanlaer, J Wang, V Adler, K Beernaert, A Cimmino, S Costantini, G Garcia, M Grunewald, B Klein, J Lellouch, A Marinov, J McCartin, AA Ocampo Rios, D Ryckbosch, N Strobbe, F Thyssen, M Tytgat, L Vanelderen, P Verwilligen, S Walsh, E Yazgan, N Zaganidis, S Basegmez, G Bruno, R Castello, A Caudron

Abstract:

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.))×10-8 W+ and (154±10(stat.)±12(syst.))×10-8 W- 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. © 2012 CERN.
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Further search for supersymmetry at sqrt(s) = 7 TeV in final states with jets, missing transverse momentum and isolated leptons with the ATLAS detector

ArXiv 1208.4688 (2012)
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Search for supersymmetry in events with b-quark jets and missing transverse energy in pp collisions at 7 TeV

ArXiv 1208.4859 (2012)
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Production of the excited charm mesons D_1 and D^*_2 at HERA

ArXiv 1208.4468 (2012)
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A multi-tiered data structure and process management system based on ROOT and CouchDB

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 684 (2012) 63-72

Authors:

GA Cox, E Armengaud, C Augier, A Benoît, L Bergé, T Bergmann, J Blümer, G Bres, A Broniatowski, V Brudanin, B Censier, M Chapellier, G Chardin, F Charlieux, S Collin, P Coulter, O Crauste, M De Jésus, J Domange, L Dumoulin, K Eitel, D Filosofov, N Fourches, J Gascon, G Gerbier, J Gironnet, M Gros, S Henry, S Hervé, S Jokisch, A Juillard, M Kleifges, H Kluck, V Kozlov, H Kraus, VA Kudryavtsev, P Loaiza, S Marnieros, A Menshikov, XF Navick, C Nones, E Olivieri, P Pari, L Pattavina, B Paul, M Robinson, H Rodenas, S Rozov, V Sanglard, B Schmidt, S Semikh, D Tcherniakhovski, AS Torrento-Coello, M Unrau, L Vagneron, MA Verdier, RJ Walker, M Weber, E Yakushev, X Zhang

Abstract:

A multi-tiered data structure, analysis toolkit and data processing management system has been constructed using ROOT and CouchDB. This system is well suited for experiments that acquire many computer files of raw data over the course of months or years, that are distributed to different computing centers and further reduced in size by several steps of data processing. Data handling for experiments searching for rare events extracted from digitized pulse traces typically fit this description. An implementation of this system has been constructed for the EDELWEISS-III experiment and is described here in some detail. This solution may also serve as a prototype system for the proposed EURECA experiment. © 2012 Elsevier B.V. All rights reserved.
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