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	Observation of eta(c)(2s) -> p(p)over-bar and search for x(3872) -> p(p)over-bar decays
	Aaij, R.40; Adeva, B.39; Adinolfi, M.48; Ajaltouni, Z.5; Akar, S.6; Albrecht, J.10; Alessio, F.40; Alexander, M.53; Ali, S.43; Alkhazov, G.31
刊名	Physics letters b
	2017-06-10
卷号	769页码:305-313
ISSN号	0370-2693
DOI	10.1016/j.physletb.2017.03.046
通讯作者	Cardinale, r.(roberta.cardinale@cem.ch) ; Patrignani, c.(claudia.patrignani@cern.ch)
英文摘要	The first observation of the decay eta(c)(2s) -> p (p) over bar is reported using proton -proton collision data corresponding to an integrated luminosity of 3.0 fb(-1) recorded by the lhcb experiment at centre -of -mass energies of 7 and 8 tev. the eta c(2s) resonance is produced in the decay b+ [c (c) over bar ]k+. the product of branching fractions normalised to that for the intermediate state, r-eta c,(2s), is measured to be r-eta c,(2s) equivalent to b(b+-> eta c (2s)k+) x b(eta c(2s)(2s) -> p<<(p)over bar> )/b(b+ -> j/psi k(+)) x b(j/psi -> p<<(p)over bar> ) = (1.58 +/- 0.33 +/- 0.09) x 10(-2), where the first uncertainty is statistical and the second systematic. no signals for the decays b+ -> x(3872)(-> p (p) over bar )k+ and b+ psi(3770)(-> p (p) over bar )k+ are seen, and the 95% confidence level upper limits on their relative branching ratios are found to be r-x(3872) < 0.25 x 10(-2) and r-psi(3770) < 0.10. in addition, the mass differences between the nc(1s) and the j/psi states, between the eta(c)(2s) and the eta(c)(2s) states, and the natural width of the psi(1s) are measured as m-j/psi - m-eta c(7s)= 110.2 +/- 0.5 +/- 0.9 mev, m psi(2s) - m-eta c (2s) = 52.5 +/- 1.7 +/- 0.6 mev, gamma(eta c) (1s) = 34.0 +/- 1.9 +/- 1.3 mev. (c) 2017 published by elsevier b.v.
WOS关键词	DISTRIBUTIONS ; TOOL
WOS研究方向	Astronomy & Astrophysics ; Physics
WOS类目	Astronomy & Astrophysics ; Physics, Nuclear ; Physics, Particles & Fields
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000402342500048
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2177360
专题	高能物理研究所
通讯作者	Cardinale, R.; Patrignani, C.
作者单位	1.CBPF, Rio De Janeiro, Brazil 2.Univ Fed Rio de Janeiro, Rio de Janeiro, Brazil 3.Tsinghua Univ, Ctr High Energy Phys, Beijing, Peoples R China 4.Univ Savoie Mt Blanc, CNRS, IN2P3, LAPP, Annecy Le Vieux, France 5.Univ Blaise Pascal, CNRS, IN2P3, Clermont Univ,LPC, Clermont Ferrand, France 6.Aix Marseille Univ, CNRS, IN2P3, CPPM, Marseille, France 7.Univ Paris 11, CNRS, IN2P3, LAL, Orsay, France 8.Univ Paris Diderot, CNRS, IN2P3, LPNHE,Univ Pierre & Marie Curie, Paris, France 9.Rhein Westfal TH Aachen, Phys Inst 1, Aachen, Germany 10.Tech Univ Dortmund, Fak Phys, Dortmund, Germany
推荐引用方式 GB/T 7714	Aaij, R.,Adeva, B.,Adinolfi, M.,et al. Observation of eta(c)(2s) -> p(p)over-bar and search for x(3872) -> p(p)over-bar decays[J]. Physics letters b,2017,769:305-313.
APA	Aaij, R..,Adeva, B..,Adinolfi, M..,Ajaltouni, Z..,Akar, S..,...&Zucchelli, S..(2017).Observation of eta(c)(2s) -> p(p)over-bar and search for x(3872) -> p(p)over-bar decays.Physics letters b,769,305-313.
MLA	Aaij, R.,et al."Observation of eta(c)(2s) -> p(p)over-bar and search for x(3872) -> p(p)over-bar decays".Physics letters b 769(2017):305-313.

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