The b-bbar production cross section in 920 GeV proton-nucleus fixed target collisions is measured by observing double muonic decays of b-flavored hadrons in the kinematic region $-0.3<xF(mu)<0.15$. A total number of $76pm12$ b-bbar events is obtained with a likelihood fit of the signal and background simulated events to the data. The resulting cross section is $sigbb = 16.2 pm 2.5_{stat} pm 2.8_{sys} nbpn$, or, when combined with a previous Hera-B measurement of similar precision, $sigbb = 15.4 pm 1.7_{stat} pm 1.2_{sys}^{uncorr.} pm 1.9_{sys}^{corr.} nbpn$, which is consistent with recent NLO calculations.
I. ABT, M. ADAMS, M. AGARI, H. ALBRECHT, A. ALEKSANDROV, V. AMARAL, et al. (2007). Bottom production cross section from double muonic decays of b-hadrons in 920 GeV proton-nucleus collision. PHYSICS LETTERS. SECTION B, 650, 103-110 [10.1016/j.physletb.2007.04.022].
Bottom production cross section from double muonic decays of b-hadrons in 920 GeV proton-nucleus collision
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
2007
Abstract
The b-bbar production cross section in 920 GeV proton-nucleus fixed target collisions is measured by observing double muonic decays of b-flavored hadrons in the kinematic region $-0.3<xF(mu)<0.15$. A total number of $76pm12$ b-bbar events is obtained with a likelihood fit of the signal and background simulated events to the data. The resulting cross section is $sigbb = 16.2 pm 2.5_{stat} pm 2.8_{sys} nbpn$, or, when combined with a previous Hera-B measurement of similar precision, $sigbb = 15.4 pm 1.7_{stat} pm 1.2_{sys}^{uncorr.} pm 1.9_{sys}^{corr.} nbpn$, which is consistent with recent NLO calculations.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.