Observation of $\Upsilon$(1S) pair production in proton-proton collisions at $ \sqrt{s}=8 $ TeV - INSPIRE

DataBETA

Observation of $\Upsilon$ (1S) pair production in proton-proton collisions at $\sqrt{s}=8$ TeV

CMS

Collaboration

Oct 22, 2016

30 pages

Published in:

JHEP 05 (2017) 013

Published: May 3, 2017

e-Print:

1610.07095 [hep-ex]

DOI:

10.1007/JHEP05(2017)013

Report number:

CMS-BPH-14-008,
CERN-EP-2016-237

Experiments:

CERN-LHC-CMS

View in:

reference search134 citations

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Abstract: (Springer)

Pair production of Y(1S) mesons is observed at the LHC in proton-proton collisions at

\sqrt{s}=8

TeV by the CMS experiment in a data sample corresponding to an integrated luminosity of 20.7 fb

^{−1}

. Both Y(1S) candidates are fully reconstructed via their decays to μ

^{+}

μ

^{−}

. The fiducial acceptance region is defined by an absolute Y(1S) rapidity smaller than 2.0. The fiducial cross section for the production of Y(1S) pairs, assuming that both mesons decay isotropically, is measured to be 68.8±12.7 (stat)±7.4 (syst)±2.8 (

\mathrm{\mathcal{B}}

) pb, where the third uncertainty comes from the uncertainty in the branching fraction of Y(1S) decays to μ

^{+}

μ

^{−}

. Assuming instead that the Y(1S) mesons are produced with different polarizations leads to variations in the measured cross section in the range from −38% to +36%.

Note:

Replaced with the published version. Added the journal reference and DOI. All figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/BPH-14-008/index.html

Hadron-Hadron scattering (experiments)
Quarkonium
p p: scattering
p p: colliding beams
Upsilon(9460): pair production
Upsilon(9460): leptonic decay
muon: pair production
Upsilon(9460): branching ratio
Upsilon(9460): hadroproduction
Upsilon(9460): rapidity

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