Observation of $Z$ production in proton-lead collisions at LHCb - INSPIRE

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Observation of $Z$ production in proton-lead collisions at LHCb

LHCb

Collaboration

Jun 11, 2014

18 pages

Published in:

JHEP 09 (2014) 030

Published: 2014

e-Print:

1406.2885 [hep-ex]

DOI:

10.1007/JHEP09(2014)030

Report number:

CERN-PH-EP-2014-126,
LHCB-PAPER-2014-022

Experiments:

CERN-LHC-LHCb

View in:

reference search75 citations

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Abstract: (arXiv)

The first observation of

Z

boson production in proton-lead collisions at a centre-of-mass energy per proton-nucleon pair of

\sqrt{s_{NN}}=5~\text{TeV}

is presented. The data sample corresponds to an integrated luminosity of

1.6~\text{nb}^{-1}

collected with the LHCb detector. The

Z

candidates are reconstructed from pairs of oppositely charged muons with pseudorapidities between 2.0 and 4.5 and transverse momenta above

20~\text{GeV}/c

. The invariant dimuon mass is restricted to the range

60-120~\text{GeV}/c^2

. The

Z

production cross-section is measured to be \begin{eqnarray*} \sigma_{Z\to\mu^+\mu^-}(\text{fwd})&=&13.5^{+5.4}_{-4.0}\text{(stat.)}\pm1.2\text{(syst.)}~\text{nb} \end{eqnarray*} in the direction of the proton beam and \begin{eqnarray*} \sigma_{Z\to\mu^+\mu^-}(\text{bwd}) & =&10.7^{+8.4}_{-5.1}\text{(stat.)}\pm1.0\text{(syst.)}~\text{nb} \end{eqnarray*} in the direction of the lead beam, where the first uncertainty is statistical and the second systematic.

Note:

19 pages, 3 figures

Electroweak interaction
Heavy Ions
Heavy-ion collision
Particle and resonance production
Forward physics
channel cross section: measured
dimuon: mass spectrum
LHC-B
p nucleus: inclusive reaction
Z0: hadroproduction

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