Observation of eta(c)(2s) -> p(p)over-bar and search for x(3872) -> p(p)over-bar decays
文献类型：期刊论文
| 作者 | 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
 |
| 出版日期 | 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 |
| URI标识 | http://www.irgrid.ac.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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