The proton-nucleon cross section ratio R=Br(Upsilon to l^+l^-) d_sigma(Upsilon)/dy|_{y=0} / sigma(J/psi) has been measured with the HERA-B spectrometer in fixed-target proton-nucleus collisions at 920 GeV proton beam energy corresponding to a proton-nucleon cms energy of sqrt(s)=41.6 GeV. The combined results for the Upsilon decay channels Upsilon to e^+e^- and Upsilon to mu^+mu^- yield a ratio R = (9.0 +/- 2.1) 10^-6. The corresponding Upsilon production cross section per nucleon at mid-rapidity (y=0) has been determined to be Br(Upsilon to l^+l^-) d_sigma(Upsilon)/dy|_{y=0} = 4.5 +/- 1.1 pb/nucleon.

I. ABT, M. ADAMS, M. AGARI, H. ALBRECHT, A. ALEKSANDROV, V. AMARAL, et al. (2006). Measurement of the Upsilon production cross-section in 920-GeV fixed-target proton-nucleus collisions. PHYSICS LETTERS. SECTION B, 638, 13-21 [10.1016/j.physletb.2006.04.042].

Measurement of the Upsilon production cross-section in 920-GeV fixed-target proton-nucleus collisions

BERTIN, ANTONIO;DE CASTRO, STEFANO;FABBRI, LAURA;FACCIOLI, PIETRO;MASSA, IGNAZIO GIACOMO;PICCININI, MAURIZIO;SBRIZZI, ANTONIO;SEMPRINI CESARI, NICOLA;VILLA, MAURO;VITALE, ANTONIO;ZOCCOLI, ANTONIO
2006

Abstract

The proton-nucleon cross section ratio R=Br(Upsilon to l^+l^-) d_sigma(Upsilon)/dy|_{y=0} / sigma(J/psi) has been measured with the HERA-B spectrometer in fixed-target proton-nucleus collisions at 920 GeV proton beam energy corresponding to a proton-nucleon cms energy of sqrt(s)=41.6 GeV. The combined results for the Upsilon decay channels Upsilon to e^+e^- and Upsilon to mu^+mu^- yield a ratio R = (9.0 +/- 2.1) 10^-6. The corresponding Upsilon production cross section per nucleon at mid-rapidity (y=0) has been determined to be Br(Upsilon to l^+l^-) d_sigma(Upsilon)/dy|_{y=0} = 4.5 +/- 1.1 pb/nucleon.
2006
I. ABT, M. ADAMS, M. AGARI, H. ALBRECHT, A. ALEKSANDROV, V. AMARAL, et al. (2006). Measurement of the Upsilon production cross-section in 920-GeV fixed-target proton-nucleus collisions. PHYSICS LETTERS. SECTION B, 638, 13-21 [10.1016/j.physletb.2006.04.042].
I. ABT; M. ADAMS; M. AGARI; H. ALBRECHT; A. ALEKSANDROV; V. AMARAL; A. AMORIM; S.J. APLIN; V. AUSHEV; Y. BAGATURIA; V. BALAGURA; M. BARGIOTTI; O. BARS...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/36704
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