The associated production of a Z boson or an off-shell photon γ* with a bottom quark in the forward region is studied using proton-proton collisions at a centre-of-mass energy of 7 TeV. The Z bosons are reconstructed in the Z/γ* → μ+ μ− final state from muons with a transverse momentum larger than 20 GeV, while two transverse momentum thresholds are considered for jets (10 GeV and 20 GeV). Both muons and jets are reconstructed in the pseudorapidity range 2.0 < η < 4.5. The results are based on data corresponding to 1.0 fb^−1 recorded in 2011 with the LHCb detector. The measurement of the Z+b-jet cross-section is normalized to the Z+jet cross-section. The measured cross-sections are σ(Z/γ∗(μ+ μ−) + b-jet) = 295 ± 60(stat) ± 51(syst) ± 10(lumi) fb for p_T(jet) > 10 GeV, and σ(Z/γ∗(μ+ μ−) + b-jet) = 128 ± 36(stat) ± 22(syst) ± 5(lumi) fb for p_T(jet) > 20 GeV.

R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, et al. (2015). Measurement of the Z+b-jet Cross-Section in pp Collisions at √s = 7 TeV in the Forward Region. JOURNAL OF HIGH ENERGY PHYSICS, 2015(01), 0-14 [10.1007/JHEP01(2015)064].

Measurement of the Z+b-jet Cross-Section in pp Collisions at √s = 7 TeV in the Forward Region

L. Capriotti;CARBONE, ANGELO;GALLI, DOMENICO;MOGGI, NICCOLO';MUSSINI, MANUEL;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZANGOLI, MARIA;
2015

Abstract

The associated production of a Z boson or an off-shell photon γ* with a bottom quark in the forward region is studied using proton-proton collisions at a centre-of-mass energy of 7 TeV. The Z bosons are reconstructed in the Z/γ* → μ+ μ− final state from muons with a transverse momentum larger than 20 GeV, while two transverse momentum thresholds are considered for jets (10 GeV and 20 GeV). Both muons and jets are reconstructed in the pseudorapidity range 2.0 < η < 4.5. The results are based on data corresponding to 1.0 fb^−1 recorded in 2011 with the LHCb detector. The measurement of the Z+b-jet cross-section is normalized to the Z+jet cross-section. The measured cross-sections are σ(Z/γ∗(μ+ μ−) + b-jet) = 295 ± 60(stat) ± 51(syst) ± 10(lumi) fb for p_T(jet) > 10 GeV, and σ(Z/γ∗(μ+ μ−) + b-jet) = 128 ± 36(stat) ± 22(syst) ± 5(lumi) fb for p_T(jet) > 20 GeV.
2015
R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, et al. (2015). Measurement of the Z+b-jet Cross-Section in pp Collisions at √s = 7 TeV in the Forward Region. JOURNAL OF HIGH ENERGY PHYSICS, 2015(01), 0-14 [10.1007/JHEP01(2015)064].
R. Aaij; B. Adeva; M. Adinolfi; A. Affolder; Z. Ajaltouni; S. Akar; J. Albrecht; F. Alessio; M. Alexander; S. Ali; G. Alkhazov; P. Alvarez Cartelle; A...espandi
File in questo prodotto:
File Dimensione Formato  
2015-AR-02-Meas_of_the_Z_plus_b_jet_Cross_Section_in_pp_Coll-JHEP.pdf

accesso aperto

Tipo: Versione (PDF) editoriale
Licenza: Licenza per Accesso Aperto. Creative Commons Attribuzione (CCBY)
Dimensione 409.37 kB
Formato Adobe PDF
409.37 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/412852
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 13
  • ???jsp.display-item.citation.isi??? 11
social impact