Observation and measurements of the production of prompt and non-prompt $J/\psi$ mesons in association with a $Z$ boson 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 European Physical Journal C: Particles and Fields Année : 2015

Observation and measurements of the production of prompt and non-prompt $J/\psi$ mesons in association with a $Z$ boson in $pp$ collisions at $\sqrt{s}= 8$ TeV with the ATLAS detector

G. Aad (1) , S. Albrand (2) , J. Brown (2) , J. Collot (2) , S. Crépé-Renaudin (2) , P.A. Delsart (2) , C. Gabaldon (2) , M.H. Genest (2) , J.Y. Hostachy (2) , F. Ledroit-Guillon (2) , A. Lleres (2) , A. Lucotte (2) , F. Malek (2) , C. Monini (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) , T. Hryn’ova (4) , S. Jézéquel (4) , H. Keoshkerian (4) , I. Koletsou (4) , R. Lafaye (4) , J. Leveque (4) , V.P. Lombardo (4) , N. Massol (4) , G. Sauvage (4) , E. Sauvan (4) , M. Schwoerer (4) , O. Simard (4) , T. Todorov (4) , I. Wingerter-Seez (4) , L. Alio , M. Barbero , J. C. Clémens (1) , Y. Coadou (1) , Sara Diglio (1) , F. Djama (1) , L. Feligioni (1) , G.D. Hallewell (1) , D. Hoffmann (1) , F. Hubaut (1) , E. B. F. G. Knoops (1) , E. Le Guirriec (1) , B. Li (1) , D. Madaffari (1) , K. Mochizuki (1) , E. Monnier (1) , S. Muanza (1) , Y. Nagai (1) , P. Pralavorio (1) , A. Rozanov (1) , T. Serre (1) , M. Talby (1) , E. Tiouchichine (1) , S. Tisserant (1) , J. Toth (1) , F. Touchard (1) , M. Ughetto (1) , L. Vacavant (1) , M.K. Ayoub (5) , A. Bassalat (5) , C. Becot (5) , S. Binet (5) , C. Bourdarios (5) , J.B. de Vivie de Regie (5) , D. Delgove (5) , L. Duflot (5) , M. Escalier (5) , L. Fayard (5) , D. Fournier (5) , E.L. Gkougkousis (5) , J.-F. Grivaz (5) , T. Guillemin (5) , F. Hariri (5) , S. Henrot-Versillé (5) , J. Hrivnac (5) , L. Iconomidou-Fayard (5) , M. Kado (5) , A. Lounis (5) , N. Makovec (5) , N. Morange (5) , C. Nellist (5) , L. Poggioli (5) , P. Puzo (5) , A. Renaud (5) , D. Rousseau (5) , G. Rybkin (5) , A.C. Schaffer (5) , E. Scifo (5) , L. Serin (5) , S. Simion (5) , R. Tanaka (5) , H.L. Tran (5) , D. Zerwas (5) , Z. Zhang (5) , Y. Zhao (5)
G. Aad
N. Berger
T. Hryn’ova
L. Alio
  • Fonction : Auteur
M. Barbero
  • Fonction : Auteur
Y. Coadou
E. Monnier
D. Rousseau
D. Zerwas
  • Fonction : Auteur
  • PersonId : 842996

Résumé

The production of a $Z$ boson in association with a $J/\psi$ meson in proton--proton collisions probes the production mechanisms of quarkonium and heavy flavour in association with vector bosons, and allows studies of multiple parton scattering. Using $20.3$ fb$^{-1}$ of data collected with the ATLAS experiment at the LHC, in $pp$ collisions at $\sqrt{s}=8$ TeV, the first measurement of associated $Z + J/\psi$ production is presented for both prompt and non-prompt $J/\psi$ production, with both signatures having a significance in excess of $5\sigma$. The inclusive production cross-sections for $Z$ boson production (in $\mu^+\mu^-$ or $e^+e^-$ decay modes) in association with prompt and non-prompt $J/\psi(\to\mu^+\mu^-)$ are measured relative to the inclusive production rate of $Z$ bosons in the same fiducial volume to be $(88\pm 16\pm 6) \times 10^{-8}$ and $(157\pm 22\pm 10) \times 10^{-8}$ respectively. Normalised differential production cross-sections are also determined as a function of the $J/\psi$ transverse momentum. The fraction of signal events arising from single and double parton scattering is estimated, and a lower limit of $5.3\ (3.7)$ mb at $68\ (95)$% confidence level is placed on the effective cross-section regulating double parton interactions.

Dates et versions

in2p3-01097769 , version 1 (22-12-2014)

Identifiants

Citer

G. Aad, S. Albrand, J. Brown, J. Collot, S. Crépé-Renaudin, et al.. Observation and measurements of the production of prompt and non-prompt $J/\psi$ mesons in association with a $Z$ boson in $pp$ collisions at $\sqrt{s}= 8$ TeV with the ATLAS detector. European Physical Journal C: Particles and Fields, 2015, 75 (5), pp.229. ⟨10.1140/epjc/s10052-015-3406-9⟩. ⟨in2p3-01097769⟩
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