Observation of gamma(1S) pair production in proton-proton collisions at root s=8 TeV

doi:10.1007/JHEP05(2017)013

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	Observation of gamma(1S) pair production in proton-proton collisions at root s=8 TeV
	CMS Collaboration
刊名	JOURNAL OF HIGH ENERGY PHYSICS
	2017
期号	5 页码:13
关键词	Hadron-Hadron scattering (experiments) Quarkonium
ISSN号	1029-8479
DOI	10.1007/JHEP05(2017)013
文献子类	Article
英文摘要	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%.
WOS关键词	DOUBLE PARTON SCATTERINGS ; HADRONIC PRODUCTION ; SMALL-X ; QCD ; QUARKONIUM ; COHERENCE ; MESON
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000400871100001
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/284354]
专题	高能物理研究所_粒子天体物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	CMS Collaboration. Observation of gamma(1S) pair production in proton-proton collisions at root s=8 TeV[J]. JOURNAL OF HIGH ENERGY PHYSICS,2017(5):13.
APA	CMS Collaboration.(2017).Observation of gamma(1S) pair production in proton-proton collisions at root s=8 TeV.JOURNAL OF HIGH ENERGY PHYSICS(5),13.
MLA	CMS Collaboration."Observation of gamma(1S) pair production in proton-proton collisions at root s=8 TeV".JOURNAL OF HIGH ENERGY PHYSICS .5(2017):13.