Artículos de revistas
Observation of gamma(1S) pair production in proton-proton collisions at root s=8 TeV
Fecha
2017-05-03Registro en:
Journal Of High Energy Physics. New York: Springer, n. 5, 34 p., 2017.
1029-8479
10.1007/JHEP05(2017)013
WOS:000400871100001
WOS000400871100001.pdf
Autor
Yerevan Phys Inst
Inst Hochenergiephys
Inst Nucl Problems
Natl Ctr Particle & High Energy Phys
Univ Antwerp
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Universidade do Estado do Rio de Janeiro (UERJ)
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Inst Nucl Energy Res
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Institución
Resumen
Pair production of gamma(1S) mesons is observed at the LHC in proton-proton collisions at root s = 8 TeV by the CMS experiment in a data sample corresponding to an integrated luminosity of 20.7 fb(-1). Both gamma(1S) candidates are fully reconstructed via their decays to mu(+) mu(-). The fiducial acceptance region is defined by an absolute gamma(1S) rapidity smaller than 2.0. The fiducial cross section for the production of gamma(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 gamma(1S) decays to mu(+) mu(-). Assuming instead that the gamma(1S) mesons are produced with different polarizations leads to variations in the measured cross section in the range from 38% to +36%.