Measurement of the $\Upsilon$(1S) production cross-section in $pp$ collisions at $\sqrt{s}=$ 7 TeV in ATLAS - INSPIRE

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Measurement of the $\Upsilon$ (1S) production cross-section in $pp$ collisions at $\sqrt{s}=$ 7 TeV in ATLAS

ATLAS

Collaboration

Jun, 2011

19 pages

Published in:

Phys.Lett.B 705 (2011) 9-27

Published: Jul 16, 2013

e-Print:

1106.5325 [hep-ex]

DOI:

10.1016/j.physletb.2011.09.092

Report number:

CERN-PH-EP-2011-083

Experiments:

CERN-LHC-ATLAS

View in:

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Abstract: (Elsevier)

A measurement of the cross-section for ϒ(1S)→μ+μ− production in proton–proton collisions at centre of mass energy of 7 TeV is presented. The cross-section is measured as a function of the ϒ(1S) transverse momentum in two bins of rapidity, |yϒ(1S)|<1.2 and 1.2<|yϒ(1S)|<2.4 . The measurement requires that both muons have transverse momentum pTμ>4 GeV and pseudorapidity |ημ|<2.5 in order to reduce theoretical uncertainties on the acceptance, which depend on the poorly known polarisation. The results are based on an integrated luminosity of 1.13 pb −1 , collected with the ATLAS detector at the Large Hadron Collider. The cross-section measurement is compared to theoretical predictions: it agrees to within a factor of two with a prediction based on the NRQCD model including colour-singlet and colour-octet matrix elements as implemented in Pythia while it disagrees by up to a factor of ten with the next-to-leading order prediction based on the colour-singlet model.

Note:

10 pages plus author list (24 pages total), 3 figures, 1 table, final version as appears in Physics Letters B

Upsilon(9460): transverse momentum
Upsilon(9460): hadroproduction
quantum chromodynamics: nonrelativistic
rapidity dependence
ATLAS
CERN LHC Coll
PYTHIA
experimental results
p p: interaction
Upsilon(9460): leptonic decay

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