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.
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.File in questo prodotto:
Eventuali allegati, non sono esposti
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.