A bstract Measurements of inclusive W and Z boson production cross-sections in pp collisions at $ \sqrt {s} = 7\,{\text{TeV}} $ using final states containing muons are presented. The data sample corresponds to an integrated luminosity of 37 pb −1 collected with the LHCb detector. The W and Z bosons are reconstructed from muons with a transverse momentum above 20 GeV/c and pseudorapidity between 2 . 0 and 4 . 5, and, in the case of the Z cross-section, a dimuon invariant mass between 60 and 120 GeV/c 2 . The cross-sections are measured to be 831 ± 9 ± 27 ± 29pb for W + , 656 ± 8 ± 19 ± 23 for W − and 76 . 7 ± 1 . 7 ± 3 . 3 ± 2 . 7pb for Z , where the first uncertainty is statistical, the second is systematic and the third is due to the luminosity. Differential cross-sections, W and Z cross-section ratios and the lepton charge asymmetry are also measured in the same kinematic region. The ratios are determined to be $ {\sigma_{{{W^{ + }} \to {\mu^{ + }}\nu }}}/{\sigma_{{{W^{ - }} \to {\mu^{ - }}\overline \nu }}} = 1.27\pm 0.02\pm 0.01 $ and $ \left( {{\sigma_{{{W^{ + }} \to {\mu^{ + }}\nu }}} + {\sigma_{{{W^{ - }} \to {\mu^{ - }}\overline \nu }}}} \right)/{\sigma_{{Z \to \mu \mu }}} = 19.4\pm 0.5\pm 0.9 $ . The results are in general agreement with theoretical predictions, performed at next-to-next-to-leading order in QCD using recently calculated parton distribution functions.

Pseudorapidity

Invariant mass

10.1007/jhep06(2012)058

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A measurement and QCD analysis of the proton structure function F2 (x, Q2) at HERA

Nuclear Physics B (1996)

S. Aïd V. Andreev Bernard Andrieu R.D. Appuhn M. Arpagaus

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10.1016/0550-3213(96)00211-8

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Measurement of thee + ande − induced charged current cross sections at HERA

Zeitschrift für Physik C (1995)

S. Aïd V. Andreev Bernard Andrieu R.D. Appuhn M. Arpagaus

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10.1007/bf01553982

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D∗± meson production in deep-inelastic diffractive interactions at HERA

Physics Letters B (2001)

C. Adloff V. Andreev Bernard Andrieu T. Anthonis V. Arkadov

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10.1016/s0370-2693(01)01155-8

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First observation of B ¯ s 0 → D s 2 ⁎ + X μ − ν ¯ decays

Physics Letters B (2011)

R. Aaij B. Adeva M. Adinolfi C. Adrover A. A. Affolder

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LHCb Online system Data acquisition and experiment control : Technical design report

P.R.B. Marinho I. Bediaga A.F. Barbosa G. Cernicchiaro E. Correa de Oliveira

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Possible violation of the δS=δQ selection rule in leptonic decays of σ+-hyperons

Zeitschrift für Physik A Hadrons and Nuclei (1967)

F. Eisele R. Engelmann H. Filthuth W. Föhlisch V. Hepp

Branching fraction

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10.1007/bf01325596

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Kinematic distributions and nuclear effects of J/ψ production in 920 GeV fixed-target proton-nucleus collisions

The European Physical Journal C (2009)

I. Abt M. R. Adams M. Agari H. Albrecht А. Александров

Measurements of the kinematic distributions of $J/ψ$ mesons produced in $p-$C, $p-$Ti and $p-$W collisions at $\sqrt{s}=41.6 \mathrm{GeV}$ in the Feynman-$x$ region $-0.34 < x_{F} < 0.14$ and for transverse momentum up to $p_T = 5.4 \mathrm{GeV}/c$ are presented. The $x_F$ and $p_T$ dependencies of the nuclear suppression parameter, $α$, are also given. The results are based on $2.4 \cdot 10^{5}$ $J/ψ$ mesons in both the $e^+ e^-$ and $μ^{+}μ^{-}$ decay channels. The data have been collected by the HERA-B experiment at the HERA proton ring of the DESY laboratory. The measurement explores the negative region of $x_{F}$ for the first time. The average value of $α$ in the measured $x_{F}$ region is $0.981 \pm 0.015$. The data suggest that the strong nuclear suppression of $J/ψ$ production previously observed at high $x_F$ turns into an enhancement at negative $x_F$.

DESY

10.1140/epjc/s10052-009-0965-7

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Citations (66)