Measurements of $Z\gamma$ and $Z\gamma\gamma$ production in $pp$ collisions at $\sqrt{s}=$ 8 TeV with the ATLAS detector - IN2P3 - Institut national de physique nucléaire et de physique des particules
Article Dans Une Revue Physical Review D Année : 2016

Measurements of $Z\gamma$ and $Z\gamma\gamma$ production in $pp$ collisions at $\sqrt{s}=$ 8 TeV with the ATLAS detector

G. Aad (1) , S. Albrand (2) , S. Berlendis (2) , C. Camincher (2) , J. Collot (2) , S. Crépé-Renaudin (2) , P.A. Delsart (2) , C. Gabaldon (2) , M.H. Genest (2) , J. Gradin (2) , J.Y. Hostachy (2) , F. Ledroit-Guillon (2) , A. Lleres (2) , A. Lucotte (2) , F. Malek (2) , E. Petit (2) , J. Stark (2) , B. Trocmé (2) , M. Wu (2) , G. Rahal (3) , Z. Barnovska (4) , N. Berger (4) , M. Delmastro (4) , L. Di Ciaccio (4) , S. Elles (4) , K. Grevtsov (4) , T. Hryn’ova (4) , S. Jézéquel (4) , I. Koletsou (4) , R. Lafaye (4) , Jérémy Lévêque (4) , P. Mastrandea (4) , G. Sauvage (4) , E. Sauvan (4) , O. Simard (4) , T. Todorov (4) , I. Wingerter-Seez (4) , E. Yatsenko (4) , D. Boumediene (5) , E. Busato (5) , D. Calvet (5) , S. Calvet (5) , A.R. Chomont (5) , J. Donini (5) , Ph. Gris (5) , H. Liao (5) , R. Madar (5) , D. Pallin (5) , S.M. Romano Saez (5) , C. Santoni (5) , D. Simon (5) , F. Vazeille (5) , M. Barbero (1) , A. Calandri (1) , T.P. Calvet (1) , Y. Coadou (1) , C. Diaconu (1) , Sara Diglio (1) , F. Djama (1) , V. Ellajosyula (1) , L. Feligioni (1) , J. Gao (1) , A. Hadef (1) , G.D. Hallewell (1) , F. Hubaut (1) , S.J. Kahn (1) , E. B. F. G. Knoops (1) , E. Le Guirriec (1) , J. Liu (1) , K. Liu (1) , D. Madaffari (1) , K. Mochizuki (1) , E. Monnier (1) , S. Muanza (1) , E. Nagy (1) , P. Pralavorio (1) , Y. Rodina (1) , A. Rozanov (1) , M. Talby (1) , T. Theveneaux-Pelzer (1) , R.E. Ticse Torres (1) , S. Tisserant (1) , J. Toth (1) , F. Touchard (1) , L. Vacavant (1) , Chen Wang (1) , M.K. Ayoub (6) , A. Bassalat (6) , S. Binet (6) , C. Becot (6) , C. Bourdarios (6) , J.B. de Vivie de Regie (6) , D. Delgove (6) , L. Duflot (6) , M. Escalier (6) , L. Fayard (6) , D. Fournier (6) , E.L. Gkougkousis (6) , J.-F. Grivaz (6) , T. Guillemin (6) , F. Hariri (6) , S. Henrot-Versille (6) , J. Hrivnac (6) , L. Iconomidou-Fayard (6) , M. Kado (6) , A. Lounis (6) , N. Makovec (6) , N. Morange (6) , C. Nellist (6) , P. Petroff (6) , L. Poggioli (6) , P. Puzo (6) , A. Renaud (6) , G. Rybkin (6) , D. Rousseau (6) , A.C. Schaffer (6) , L. Serin (6) , E. Scifo (6) , S. Simion (6) , R. Tanaka (6) , D. Zerwas (6) , Zhongkai Zhang (6) , Y. Zhao (6)
G. Aad
N. Berger
T. Hryn’ova
Y. Coadou
Chen Wang
  • Fonction : Auteur
  • PersonId : 829307
D. Rousseau
D. Zerwas
  • Fonction : Auteur
  • PersonId : 842996

Résumé

The production of $Z$ bosons with one or two isolated high-energy photons is studied using $pp$ collisions at $\sqrt{s}$ = 8 TeV. The analyses use a data sample with an integrated luminosity of 20.3 fb$^{-1}$ collected by the ATLAS detector during the 2012 LHC data taking. The $Z\gamma$ and $Z\gamma\gamma$ production cross sections are measured with leptonic ($e^{+}e^{-}$, $\mu^{+}\mu^{-}$, $\nu\bar{\nu}$) decays of the $Z$ boson, in extended fiducial regions defined in terms of the lepton and photon acceptance. They are then compared to cross-section predictions from the Standard Model, where the sources of the photons are radiation off initial-state quarks and radiative $Z$-boson decay to charged leptons, and from fragmentation of final-state quarks and gluons into photons. The yields of events with photon transverse energy $E_T >$ 250 GeV from $\ell^{+}\ell^{-}\gamma$ events and with $E_T >$ 400 GeV from $\nu\bar{\nu}\gamma$ events are used to search for anomalous triple gauge-boson couplings $ZZ\gamma$ and $Z\gamma\gamma$. The yields of events with diphoton invariant mass $m_{\gamma\gamma} >$ 200 GeV from $\ell^{+}\ell^{-}\gamma\gamma$ events and with $m_{\gamma\gamma} > $ 300 GeV from $\nu\bar{\nu}\gamma\gamma$ events are used to search for anomalous quartic gauge-boson couplings $ZZ\gamma\gamma$ and $Z\gamma\gamma\gamma$. No deviations from Standard Model predictions are observed and limits are placed on parameters used to describe anomalous triple and quartic gauge-boson couplings.

Dates et versions

in2p3-01304032 , version 1 (19-04-2016)

Identifiants

Citer

G. Aad, S. Albrand, S. Berlendis, C. Camincher, J. Collot, et al.. Measurements of $Z\gamma$ and $Z\gamma\gamma$ production in $pp$ collisions at $\sqrt{s}=$ 8 TeV with the ATLAS detector. Physical Review D, 2016, 93, pp.112002. ⟨10.1103/PhysRevD.93.112002⟩. ⟨in2p3-01304032⟩

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