(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image).Production cross-sections of prompt charm mesons are measured with the first data from pp collisions at the LHC at a ...centre-of-mass energy of 13 TeV. The data sample corresponds to an integrated luminosity of 4.98 plus or minus 0.19 pb super(-1) collected by the LHCb experiment. The production cross-sections of D super(0), D super(+), D sub( )s super(+), and D super(*+) mesons are measured in bins of charm meson transverse momentum, p sub(T), and rapidity, y, and cover the range 0 < p sub(T) < 15GeV/c and 2.0 < y < 4.5. The inclusive cross-sections for the four mesons, including charge conjugation, within the range of 1 < p sub(T) < 8 GeV/c are found to be ... ... where the uncertainties are due to statistical and systematic uncertainties, respectively. Figure not available: see fulltext.
(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image).The production of psi (2S) mesons is studied in dimuon final states using proton-lead (pPb) collision data collected by the ...LHCb detector. The data sample corresponds to an integrated luminosity of 1.6 nb super(-1). The nucleon-nucleon centre-of-mass energy of the pPb collisions is ... TeV. The measurement is performed using psi (2S) mesons with transverse momentum less than 14 GeV/c and rapidity y in the ranges 1.5 < y < 4.0 and -5.0 < y < -2.5 in the nucleon-nucleon centre-of-mass system. The forward-backward production ratio and the nuclear modification factor are determined for psi (2S) mesons. Using the production cross-section results of psi (2S) and J/ psi mesons from b-hadron decays, the ... cross-section in pPb collisions at ... TeV is obtained. Figure not available: see fulltext.
The B sub(s) super(0) arrow right J/ psi decay is observed in pp collision data corresponding to an integrated luminosity of 3 fb super(-1) recorded by the LHCb detector at centre-of-mass energies of ...7 TeV and 8 TeV. This is the first observation of this decay channel, with a statistical significance of 15 standard deviations. The mass of the B sub(s) super(0) meson is measured to be 5367.08 plus or minus 0.38 plus or minus 0.15 MeV/c super(2). The branching fraction ratio (B sub(s) super(0) arrow right J/ psi )/(B sub(s) super(0) arrow right J/ psi ) is measured to be 0.0115 plus or minus 0.0012 sub(-0.0009) super(+0.0005). In both cases, the first uncertainty is statistical and the second is systematic. No evidence for non-resonant B sub(s) super(0) arrow right J/ psi K super(+) K super(-) or B sub(s) super(0) arrow right J/ psi K super(+) K super(-) K super(+) K super(-) decays is found. Figure not available: see fulltext.
The relative abundance of the three decay modes $B_d \to D^- K^+$, $B_d \to D^- \pi^+$ and $B_s \to D_s^- \pi^+$ produced in 7 TeV $pp$ collisions at the LHC is determined from data corresponding to ...an integrated luminosity of 35 pb$^{-1}$. The branching fraction of $B_d \to D^- K^+$ is found to be $\cal B (B_d \to D^- K^+) = (2.01 \pm 0.18^{\textrm{stat}} \pm 0.14^{\textrm{syst}})\times 10^{-4}$. The ratio of fragmentation fractions \fsfdt is determined through the relative abundance of $B_s \to D_s^- \pi^+$ to $B_d \to D^- K^+$ and $B_d \to D^-\pi^+$, leading to $f_s/f_d = 0.253 \pm 0.017 \pm 0.017 \pm 0.020$, where the uncertainties are statistical, systematic, and theoretical respectively.
We present here a set of examples, classes and tools which can be used for statistical analysis in Graphics Processing Units (GPU). This includes binned and unbinned maximum likelihood fits, ...pseudo-experiment generation, convolutions, Markov Chain Monte Carlo method implementations, and limit setting techniques.
(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image).A search for B sub((s)) super(0) arrow right K sub(S) super(0) K super()(892) super(0) decays is performed using pp ...collision data, corresponding to an integrated luminosity of 1.0 fb super(-1), collected with the LHCb detector at a centre-of-mass energy of 7 TeV. The B sub(s) super(0) arrow right K sub(S) super(0) K super()(892) super(0) decay is observed for the first time, with a significance of 7.1 standard deviations. The branching fraction is measured to be ... ... where the first uncertainty is statistical and the second is systematic. No evidence is found for the decay B super(0) arrow right K sub(S) super(0) K super()(892) super(0) and an upper limit is set on the branching fraction, ... , at 90 % confidence level. All results are consistent with Standard Model predictions. Figure not available: see fulltext.
(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image).The forward-backward charge asymmetry for the process ... is measured as a function of the invariant mass of the dimuon ...system. Measurements are performed using proton proton collision data collected with the LHCb detector at ... and 8 TeV, corresponding to integrated luminosities of 1 fb super(-1) and 2 fb super(-1) respectively. Within the Standard Model the results constrain the effective electroweak mixing angle to be ... ... where the first uncertainty is statistical, the second systematic and the third theoretical. This result is in agreement with the current world average, and is one of the most precise determinations at hadron colliders to date. Figure not available: see fulltext.
(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image).The production of Upsilon mesons in pp collisions at ... and 8 TeV is studied with the LHCb detector using data samples ...corresponding to an integrated luminosity of 1 fb super(-1) and 2 fb super(-1) respectively. The production cross-sections and ratios of cross-sections are measured as functions of the meson transverse momentum p and rapidity y, for p < 30 GeV/c and 2.0 < y < 4.5. Figure not available: see fulltext.
(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image).The time-integrated CP asymmetry in the decay D super(0) arrow right K sub(S) super(0) K sub(S) super(0) is measured using ...3 fb super(-1) of proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The flavour of the D super(0) meson is determined by use of the decay D super( )* arrow right D super(0) pi super(+) and its charge conjugate mode. The result is ... ... where the first uncertainty is statistical and the second systematic. The result is consistent with Standard Model expectations and improves the uncertainty with respect to the only previous measurement of this quantity by more than a factor of three. Figure not available: see fulltext.
(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image).Using a dataset corresponding to an integrated luminosity of 3.0 fb super(-1) collected in pp collisions at centre-of-mass ...energies of 7 and 8 TeV, the B sub( )s super(0) arrow right branching fraction is measured to be ... ... where f sub( )sf sub( )drepresents the ratio of the B sub( )s super(0) to B super(0) production cross-sections, and the B super(0) arrow right K super(*)(892) super(0) decay mode is used for normalization. This is the most precise measurement of this branching fraction to date, representing a factor five reduction in the statistical uncertainty compared with the previous best measurement. A search for the decay B super(0) arrow right is also made. No signal is observed, and an upper limit on the branching fraction is set as ... ... at 90% confidence level. This is a factor of seven improvement compared to the previous best limit. Figure not available: see fulltext.
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