Orateur
M.
Fabio Ferrari
(INFN - Sezione di Bologna)
Description
The scientific programme of LHCb includes a large number $CP$ violation measurements in $b$-hadron decays. To perform such measurements, one needs to disentangle the physical asymmetry from others spurious effects, such as production asymmetries arising from the flavour-asymmetric proton-proton collisions. Using an integrated luminosity of 1 fb$^{-1}$ collected at a centre-of-mass energy of 7 TeV, the $B^0$ and $B^0_s$ production asymmetries, within the LHCb acceptance, are measured. The production asymmetries, integrated over $p_T$ and $\eta$ in the range $4 < p_T < 30$ GeV/$c$ and $2.5 < \eta < 4.5$, are determined to be $A_{\rm P}(B^0) = (-0.35 \pm 0.76 \pm 0.28)\%$ and $A_{\rm P}(B^0_s) = (1.09 \pm 2.61 \pm 0.66)\%$, where the first uncertainties are statistical and the second systematic. Updates of these measurements using 2 fb$^{-1}$ of data collected at a centre-of-mass energy of 8 TeV, together with the measurement of $B^+$ and $\Lambda^0_b$ production asymmetries, are under way.
Author
M.
Fabio Ferrari
(INFN - Sezione di Bologna)
