A study is presented of central exclusive production of Υ(nS) states, where the Υ(nS) resonances decay to the μ+ μ− final state, using pp collision data recorded by the LHCb experiment. The cross-section is measured in the rapidity range 2 < y(Υ) < 4.5 where the muons are reconstructed in the pseudorapidity range 2 < η(μ±) < 4.5. The data sample corresponds to an integrated luminosity of 2.9 fb^−1 and was collected at centre-of-mass energies of 7 TeV and 8 TeV. The measured Υ(1S) and Υ(2S) production cross-sections are σ(p p → p Y(1S) p) = 9.0 ± 2.1 ± 1.7 pb and σ(p p → p Y(2S) p) = 1.3 ± 0.8 ± 0.3 pb, where the first uncertainties are statistical and the second are systematic. The Υ(1S) cross-section is also measured as a function of rapidity and is found to be in good agreement with Standard Model predictions. An upper limit is set at 3.4 pb at the 95% confidence level for the exclusive Υ(3S) production cross-section, including possible contamination from χ_b(3P) → Υ(3S) γ decays.

R. Aaij, B.A., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., Albrecht, J., et al. (2015). Measurement of the Exclusive Υ Production Cross-Section in pp Collisions at √s = 7 TeV and 8 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2015(9), 0-19 [10.1007/JHEP09(2015)084].

Measurement of the Exclusive Υ Production Cross-Section in pp Collisions at √s = 7 TeV and 8 TeV

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

Abstract

A study is presented of central exclusive production of Υ(nS) states, where the Υ(nS) resonances decay to the μ+ μ− final state, using pp collision data recorded by the LHCb experiment. The cross-section is measured in the rapidity range 2 < y(Υ) < 4.5 where the muons are reconstructed in the pseudorapidity range 2 < η(μ±) < 4.5. The data sample corresponds to an integrated luminosity of 2.9 fb^−1 and was collected at centre-of-mass energies of 7 TeV and 8 TeV. The measured Υ(1S) and Υ(2S) production cross-sections are σ(p p → p Y(1S) p) = 9.0 ± 2.1 ± 1.7 pb and σ(p p → p Y(2S) p) = 1.3 ± 0.8 ± 0.3 pb, where the first uncertainties are statistical and the second are systematic. The Υ(1S) cross-section is also measured as a function of rapidity and is found to be in good agreement with Standard Model predictions. An upper limit is set at 3.4 pb at the 95% confidence level for the exclusive Υ(3S) production cross-section, including possible contamination from χ_b(3P) → Υ(3S) γ decays.
2015
R. Aaij, B.A., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., Albrecht, J., et al. (2015). Measurement of the Exclusive Υ Production Cross-Section in pp Collisions at √s = 7 TeV and 8 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2015(9), 0-19 [10.1007/JHEP09(2015)084].
R. Aaij, B. Adeva; Adinolfi, M.; Affolder, A.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; Alessio, F.; Alexander, M.; Ali, S.; Alkhazov, G.; Cartelle, P. ...espandi
File in questo prodotto:
File Dimensione Formato  
2015-AR-44-Meas_of_the_Exclusive_Upsilon_Production_Cross-Section-JHEP.pdf

accesso aperto

Tipo: Versione (PDF) editoriale
Licenza: Licenza per Accesso Aperto. Creative Commons Attribuzione (CCBY)
Dimensione 515.61 kB
Formato Adobe PDF
515.61 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/11585/515570
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 90
  • ???jsp.display-item.citation.isi??? 58
social impact