TY - JOUR
T1 - New near-threshold mesons
AU - Cohen, Thomas D.
AU - Gelman, Boris A.
AU - Nussinov, Shmuel
N1 - Funding Information:
T.C. was supported in part by the US Department of Energy under Grant No. DE-FG02-93ER-40762. B.G. was supported by the US Department of Energy under Grant No. DE-FG03-01ER-41196. S.N. acknowledges a grant of the Israeli Academy of Science. B.G. and S.N. greatly acknowledge the hospitality of the Theory Group for Quarks, Hadrons and Nuclei at the University of Maryland, College Park.
PY - 2004/1/8
Y1 - 2004/1/8
N2 - We show that under a number of rather plausible assumptions QCD spectrum may contain a number of mesons which have not been predicted or observed. Such states will have the quantum numbers of two existing mesons and masses very close to the dissociation threshold into the two mesons. Moreover, at least one of the two mesonic constituents itself must be very close to its dissociation threshold. In particular, one might expect the existence of loosely bound systems of D and D*sJ (2317); similarly, K and f 0(980), K̄ and f0(980), K̄ and a 0(980) and K̄ and a0(980) can be bound. The mechanism for binding in these cases is the S-wave kaon exchange. The nearness of one of the constituents to its decay threshold into a kaon plus a remainder, implies that the range of the kaon exchange force becomes abnormally long-significantly longer than 1/mK which greatly aids the binding.
AB - We show that under a number of rather plausible assumptions QCD spectrum may contain a number of mesons which have not been predicted or observed. Such states will have the quantum numbers of two existing mesons and masses very close to the dissociation threshold into the two mesons. Moreover, at least one of the two mesonic constituents itself must be very close to its dissociation threshold. In particular, one might expect the existence of loosely bound systems of D and D*sJ (2317); similarly, K and f 0(980), K̄ and f0(980), K̄ and a 0(980) and K̄ and a0(980) can be bound. The mechanism for binding in these cases is the S-wave kaon exchange. The nearness of one of the constituents to its decay threshold into a kaon plus a remainder, implies that the range of the kaon exchange force becomes abnormally long-significantly longer than 1/mK which greatly aids the binding.
UR - http://www.scopus.com/inward/record.url?scp=0348046391&partnerID=8YFLogxK
U2 - 10.1016/j.physletb.2003.10.065
DO - 10.1016/j.physletb.2003.10.065
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AN - SCOPUS:0348046391
SN - 0370-2693
VL - 578
SP - 359
EP - 364
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 3-4
ER -