Header

UZH-Logo

Maintenance Infos

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


Abstract

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 ($\mathcal{B}$) 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%.

Abstract

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 ($\mathcal{B}$) 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%.

Statistics

Citations

3 citations in Web of Science®
2 citations in Scopus®
Google Scholar™

Altmetrics

Downloads

1 download since deposited on 11 Dec 2017
1 download since 12 months
Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2017
Deposited On:11 Dec 2017 14:14
Last Modified:18 Dec 2017 15:56
Publisher:Springer
ISSN:1029-8479
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1007/JHEP05(2017)013

Download

Download PDF  'Observation of Υ(1S) pair production in proton-proton collisions at $\sqrt{s}=8$ TeV'.
Preview
Content: Published Version
Filetype: PDF
Size: 572kB
View at publisher
Licence: Creative Commons: Attribution 4.0 International (CC BY 4.0)