Observation of Y(1S) pair production in proton-proton collisions at √s=8 TeV
Pair production of Υ(1S) mesons is observed at the LHC in proton-proton collisions at √ s = 8 TeV by the CMS experiment in a data sample corresponding to an integrated luminosity of 20.7 fb−1 . Both Υ(1S) candidates are fully reconstructed via their decays to µ +µ −. The fiducial acceptance r...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
Springer Verlag
2017
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/63046/ http://irep.iium.edu.my/63046/ http://irep.iium.edu.my/63046/ http://irep.iium.edu.my/63046/1/63046_Observation%20of%20Y%281S%29%20pair%20production%20in%20proton-proton_article.pdf http://irep.iium.edu.my/63046/2/63046_Observation%20of%20Y%281S%29%20pair%20production%20in%20proton-proton_scopus.pdf |
| Summary: | Pair production of Υ(1S) mesons is observed at the LHC in proton-proton
collisions at √
s = 8 TeV by the CMS experiment in a data sample corresponding to an
integrated luminosity of 20.7 fb−1
. Both Υ(1S) candidates are fully reconstructed via their
decays to µ
+µ
−. The fiducial acceptance region is defined by an absolute Υ(1S) rapidity
smaller than 2.0. The fiducial cross section for the production of Υ(1S) pairs, assuming that
both mesons decay isotropically, is measured to be 68.8±12.7 (stat)±7.4 (syst)±2.8 (B) pb,
where the third uncertainty comes from the uncertainty in the branching fraction of Υ(1S)
decays to µ
+µ
−. Assuming instead that the Υ(1S) mesons are produced with different
polarizations leads to variations in the measured cross section in the range from −38%
to +36%. |
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