Data di Pubblicazione:
2011
Abstract:
A measurement of W gamma and Z gamma production in proton-proton collisions at root s = 7 TeV is presented. Results are based on a data sample recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 36 pb(-1). The electron and muon decay channels of the W and Z are used. The total cross sections are measured for photon transverse energy E(T)(gamma) > 10 GeV and spatial separation from charged leptons in the plane of pseudorapidity and azimuthal angle Delta R(l.gamma) > 0.7, and with an additional dilepton invariant mass requirement of M(ll) > 50 GeV for the Z gamma process. The following cross section times branching fraction values are found: sigma(pp -> W gamma + X) x B(W -> lv) = 56.3 +/- 5.0(stat.) +/- 5.0(syst.) +/- 2.3(lumi.) pb and sigma(pp -> Z gamma + X) x B(Z -> ll) = 9.4 +/- 1.0(stat.) +/- 0.6(syst.) +/- 0.4(lumi.) pb. These measurements are in agreement with standard model predictions. The first limits on anomalous WW gamma, ZZ gamma, and Z gamma gamma trilinear gauge couplings at root s = 7 TeV are set.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
CMS; Physics; Electroweak
Elenco autori:
S. Chatrchyan;V. Khachatryan;A. M. Sirunyan;A. Tumasyan;W. Adam;T. Bergauer;M. Dragicevic;J. Eroe;C. Fabjan;M. Friedl;R. Fruehwirth;V. M. Ghete;J. Hammer;S. Haensel;M. Hoch;N. Hoermann;J. Hrubec;M. Jeitler;G. Kasieczka;W. Kiesenhofer;M. Krammer;D. Liko;I. Mikulec;M. Pernicka;H. Rohringer;R. Schoefbeck;J. Strauss;F. Teischinger;P. Wagner;W. Waltenberger;G. Walzel;E. Widl;C. E. Wulz;V. Mossolov;N. Shumeiko;J. S. Gonzalez;L. Benucci;E. A. De;X. Janssen;J. Maes;T. Maes;L. Mucibello;S. Ochesanu;B. Roland;R. Rougny;M. Selvaggi;H. V. Haevermaet;P. V. Mechelen;N. V. Remortel;F. Blekman;S. Blyweert;J. D'Hondt;O. Devroede;R. G. Suarez;A. Kalogeropoulos;M. Maes;W. V. Doninck;P. V. Mulders;G. P. Van;I. Villella;O. Charaf;B. Clerbaux;G. D. Lentdecker;V. Dero;A. P. R.;G. H. Hammad;T. Hreus;P. E. Marage;L. Thomas;C. V. Velde;P. Vanlaer;V. Adler;A. Cimmino;S. Costantini;M. Grunewald;B. Klein;J. Lellouch;A. Marinov;J. McCartin;D. Ryckbosch;F. Thyssen;M. Tytgat;L. Vanelderen;P. Verwilligen;S. Walsh;N. Zaganidis;S. Basegmez;G. Bruno;J. Caudron;L. Ceard;E. C. Gil;J. D. Favereau;C. Delaere;D. Favart;A. Giammanco;G. Gregoire;J. Hollar;V. Lemaitre;J. Liao;O. Militaru;S. Ovyn;D. Pagano;A. Pin;K. Piotrzkowski;N. Schul;N. Beliy;T. Caebergs;E. Daubie;G. A. Alves;D. D. Jesus;M. E. Pol;M. H. G.;W. Carvalho;E. M. Da;C. D. Oliveira;S. F. De;L. Mundim;H. Nogima;V. Oguri;W. L. Prado;A. Santoro;S. M. Silva;A. Sznajder;F. T. Da;F. A. Dias;T. R. Fernandez;E. M. Gregores;C. Lagana;F. Marinho;P. G. Mercadante;S. F. Novaes;S. S. Padula;N. Darmenov;L. Dimitrov;V. Genchev;P. Iaydjiev;S. Piperov;M. Rodozov;S. Stoykova;G. Sultanov;V. Tcholakov;R. Trayanov;I. Vankov;A. Dimitrov;R. Hadjiiska;A. Karadzhinova;V. Kozhuharov;L. Litov;M. Mateev;B. Pavlov;P. Petkov;J. G. Bian;G. M. Chen;H. S. Chen;C. H. Jiang;D. Liang;S. Liang;X. Meng;J. Tao;J. Wang;J. Wang;X. Wang;Z. Wang;H. Xiao;M. Xu;J. Zang;Z. Zhang;Y. Ban;S. Guo;Y. Guo;W. Li;Y. Mao;S. J. Qian;H. Teng;L. Zhang;B. Zhu;W. Zou;A. Cabrera;B. G. Moreno;A. A. Ocampo;A. F. Osorio;J. C. Sanabria;N. Godinovic;D. Lelas;K. Lelas;R. Plestina;D. Polic;I. Puljak;Z. Antunovic;M. Dzelalija;V. Brigljevic;S. Duric;K. Kadija;S. Morovic;A. Attikis;M. Galanti;J. Mousa;C. Nicolaou;F. Ptochos;P. A. Razis;M. Finger;M. F. Jr.;Y. Assran;S. Khalil;M. A. Mahmoud;A. Hektor;M. Kadastik;M. Muentel;M. Raidal;L. Rebane;V. Azzolini;P. Eerola;G. Fedi;S. Czellar;J. Harkonen;A. Heikkinen;V. Karimaki;R. Kinnunen;M. J. Kortelainen;T. Lampen;K. Lassila-Perini;S. Lehti;T. Linden;P. Luukka;T. Maenpaa;E. Tuominen;J. Tuominiemi;E. Tuovinen;D. Ungaro;L. Wendland;K. Banzuzi;A. Korpela;T. Tuuva;D. Sillou;M. Besancon;S. Choudhury;M. Dejardin;D. Denegri;B. Fabbro;J. L. Faure;F. Ferri;S. Ganjour;F. X. Gentit;A. Givernaud;P. Gras;G. H. de;P. Jarry;E. Locci;J. Malcles;M. Marionneau;L. Millischer;J. Rander;A. Rosowsky;I. Shreyber;M. Titov;P. Verrecchia;S. Baffioni;F. Beaudette;L. Benhabib;L. Bianchini;M. Bluj;C. Broutin;P. Busson;C. Charlot;T. Dahms;L. Dobrzynski;S. Elgammal;R. G. de;M. Haguenauer;P. Mine;C. Mironov;C. Ochando;P. Paganini;D. Sabes;R. Salerno;Y. Sirois;C. Thiebaux;B. Wyslouch;A. Zabi;J. L. Agram;J. Andrea;D. Bloch;D. Bodin;J. M. Brom;M. Cardaci;E. C. Chabert;C. Collard;E. Conte;F. Drouhin;C. Ferro;J. C. Fontaine;D. Gele;U. Goerlach;S. Greder;P. Juillot;M. Karim;A. C. Le;Y. Mikami;P. V. Hove;F. Fassi;D. Mercier;C. Baty;S. Beauceron;N. Beaupere;M. Bedjidian;O. Bondu;G. Boudoul;D. Boumediene;H. Brun;J. Chasserat;R. Chierici;D. Contardo;P. Depasse;H. E. Mamouni;J. Fay;S. Gascon;B. Ille;T. Kurca;T. L. Grand;M. Lethuillier;L. Mirabito;S. Perries;V. Sordini;S. Tosi;Y. Tschudi;P. Verdier;D. Lomidze;G. Anagnostou;M. Edelhoff;L. Feld;N. Heracle
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