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题名: Discussion on triangle singularities in the Lambda(b) -> J/psi K(-)p reaction
作者: Bayar, M ;  Aceti, F ;  Guo, FK ;  Oset, E
刊名: PHYSICAL REVIEW D
出版日期: 2016
卷号: 94, 期号:7, 页码:74039
学科分类: Astronomy & Astrophysics; Physics
DOI: http://dx.doi.org/10.1103/PhysRevD.94.074039
通讯作者: Bayar, M (reprint author), Kocaeli Univ, Dept Phys, TR-41380 Izmit, Turkey. ;  Bayar, M (reprint author), Univ Valencia, Inst Invest Paterna, Dept Fis Teor, Ctr Mixto,CSIC, Apartado 22085, Valencia 46071, Spain. ;  Bayar, M (reprint author), Univ Valencia, Inst Invest Paterna, IFIC, Ctr Mixto,CSIC, Apartado 22085, Valencia 46071, Spain.
文章类型: Article
英文摘要: We have analyzed the singularities of a triangle loop integral in detail and derived a formula for an easy evaluation of the triangle singularity on the physical boundary. It is applied to the Lambda(b) -> J/psi K(-)p process via Lambda*-charmonium-proton intermediate states. Although the evaluation of absolute rates is not possible, we identify the chi(c1) and the psi(2S)as the relatively most relevant states among all possible charmonia up to the psi(2S). The Lambda(1890)chi(c1)p loop is very special, as its normal threshold and triangle singularities merge at about 4.45 GeV, generating a narrow and prominent peak in the amplitude in the case that the chi(c1)p is in an S wave. We also see that loops with the same charmonium and other Lambda* hyperons produce less dramatic peaks from the threshold singularity alone. For the case of chi(c1)p -> J/psi p and quantum numbers 3/2(-) or 5/2(+), one needs P and D waves, respectively, in the chi(c1)p, which drastically reduce the strength of the contribution and smooth the threshold peak. In this case, we conclude that the singularities cannot account for the observed narrow peak. In the case of 1/2(+), 3/2(-) quantum numbers, where chi(c1)p -> J/psi p can proceed in an S wave, the Lambda(1890)chi(c1)p triangle diagram could play an important role, though neither can assert their strength without further input from experiments and lattice QCD calculations.
类目[WOS]: Astronomy & Astrophysics ;  Physics, Particles & Fields
收录类别: SCI
项目资助者: Spanish Ministerio de Economia y Competitividad ;  European FEDER funds [FIS2011-28853-C02-01] ;  Generalitat Valenciana in the program Prometeo II [2014/068] ;  Spanish Excellence Network on Hadronic Physics [FIS2014-57026-REDT] ;  DFG ;  NSFC [CRC 110, 11621131001] ;  Chinese Academy of Sciences [QYZDB-SSW-SYS013] ;  Thousand Talents Plan for Young Professionals
语种: 英语
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/21497
Appears in Collections:理论物理所2016年知识产出_期刊论文

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Recommended Citation:
Bayar, M,Aceti, F,Guo, FK,et al. Discussion on triangle singularities in the Lambda(b) -> J/psi K(-)p reaction[J]. PHYSICAL REVIEW D,2016,94(7):74039.
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