Measurement of the forward-backward asymmetry in $Z/\gamma^{\ast} \rightarrow \mu^{+}\mu^{-}$ decays and determination of the effective weak mixing angle - INSPIRE

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Measurement of the forward-backward asymmetry in $Z/\gamma^{\ast} \rightarrow \mu^{+}\mu^{-}$ decays and determination of the effective weak mixing angle

LHCb

Collaboration

Sep 25, 2015

20 pages

Published in:

JHEP 11 (2015) 190

Published: Nov 27, 2015

e-Print:

1509.07645 [hep-ex]

DOI:

10.1007/JHEP11(2015)190

Report number:

LHCB-PAPER-2015-039,
CERN-PH-EP-2015-250

Experiments:

CERN-LHC-LHCb

View in:

reference search153 citations

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Abstract: (Springer)

The forward-backward charge asymmetry for the process

q\overline{q}\to Z/{\gamma}^{\ast}\to {\mu}^{+}{\mu}^{-}

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

\sqrt{s}=7

and 8 TeV, corresponding to integrated luminosities of 1 fb

^{−1}

and 2 fb

^{−1}

respectively. Within the Standard Model the results constrain the effective electroweak mixing angle to be

{ \sin}^2{\theta}_{\mathrm{W}}^{\mathrm{eff}}=0.23142\pm 0.00073\pm 0.00052\pm 0.00056,

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.

Note:

All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2015-039.html

Electroweak interaction
Forward physics
Hadron-Hadron Scattering
p p: scattering
p p: colliding beams
Z0: hadroproduction
Z0: leptonic decay
muon: pair production
electroweak interaction: mixing angle
charge: asymmetry

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