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The production cross-sections of B mesons are measured in pp collisions at a centre-of-mass energy of 7 TeV, using data collected with the LHCb detector corresponding to a integrated luminosity of 0.36 fb −1 . The B + , B 0 and$ B_s^0 $mesons are reconstructed in the exclusive decays B + → J / ψK + , B 0 → J / ψK *0 and$ B_s^0\\to {J \\left/ {{\\psi \\phi }} \\right.} $, with J / ψ → μ + μ − , K *0 → K + π − and ϕ → K + K − . The differential cross-sections are measured as functions of B meson transverse momentum p T and rapidity y , in the range 0 < p T < 40 GeV /c and 2 . 0 < y < 4 . 5. The integrated cross-sections in the same p T and y ranges, including charge-conjugate states, are measured to be$ \\begin{array}{*{20}{c}} {\\sigma \\left( {pp\\to {B^{+}}+X} \\right)=38.9\\pm 0.3\\left( {\\mathrm{stat}.} \\right)\\pm 2.5\\left( {\\mathrm{syst}.} \\right)\\pm 1.3\\left( {\\mathrm{norm}.} \\right)\\upmu \\mathrm{b},} \\hfill \\\ {\\sigma \\left( {pp\\to {B^0}+X} \\right)=38.1\\pm 0.6\\left( {\\mathrm{stat}.} \\right)\\pm 3.7\\left( {\\mathrm{syst}.} \\right)\\pm 4.7\\left( {\\mathrm{norm}.} \\right)\\upmu \\mathrm{b},} \\hfill \\\ {\\sigma \\left( {pp\\to B_s^0+X} \\right)=10.5\\pm 0.2\\left( {\\mathrm{stat}.} \\right)\\pm 0.8\\left( {\\mathrm{syst}.} \\right)\\pm 1.0\\left( {\\mathrm{norm}.} \\right)\\upmu \\mathrm{b},} \\hfill \\\ \\end{array} $where the third uncertainty arises from the pre-existing branching fraction measurements.

The results of a search for the rare two-body charmless baryonic decays $B^0 \\to p \\bar{p}$ and $B_s^0 \\to p \\bar{p}$ are reported. The analysis uses a data sample, corresponding to an integrated luminosity of 0.9 fb$^{-1}$, of $pp$ collision data collected by the LHCb experiment at a centre-of-mass energy of 7 TeV. An excess of $B^0 \\to p \\bar{p}$ candidates with respect to background expectations is seen with a statistical significance of 3.3 standard deviations. This is the first evidence for a two-body charmless baryonic $B^0$ decay. No significant $B_s^0 \\to p \\bar{p}$ signal is observed, leading to an improvement of three orders of magnitude over previous bounds. If the excess events are interpreted as signal, the 68.3% confidence level intervals on the branching fractions are {eqnarray} \\cal{B}(B^0 \\to p \\bar{p}) & = & (1.47 \\,^{+0.62}_{-0.51} \\,^{+0.35}_{-0.14}) \\times 10^{-8} \\,, *{0.3cm} \\cal{B}(B_s^0 \\to p \\bar{p}) & = & (2.84 \\,^{+2.03}_{-1.68} \\,^{+0.85}_{-0.18}) \\times 10^{-8} \\,, {eqnarray} where the first uncertainty is statistical and the second is systematic.

(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image) The ... and B ^sup 0^ mixing frequencies, [Delta]m ^sub s^ and [Delta]m ^sub d^, are measured using a data sample corresponding to an integrated luminosity of 1.0 fb^sup -1^ collected by the LHCb experiment in pp collisions at a centre of mass energy of 7 TeV during 2011. Around 1.8×10^sup 6^ candidate events are selected of the type ... (+anything), where about half are from peaking and combinatorial backgrounds. To determine the B decay times, a correction is required for the momentum carried by missing particles, which is performed using a simulation-based statistical method. Associated production of muons or mesons allows us to tag the initial-state flavour and so to resolve oscillations due to mixing. We obtain ... The hypothesis of no oscillations is rejected by the equivalent of 5.8 standard deviations for ... and 13.0 standard deviations for B ^sup 0^. This is the first observation of ... mixing to be made using only semileptonic decays.

(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image) An angular analysis of the decay J/[psi][arrow right][mu] ^sup +^ [mu] ^sup -^ is performed to measure the polarization of prompt J/[psi] mesons produced in pp collisions at ... The dataset corresponds to an integrated luminosity of 0.37 fb^sup -1^ collected with the LHCb detector. The measurement is presented as a function of transverse momentum, p ^sub T^, and rapidity, y, of the J/[psi] meson, in the kinematic region 2