New near-threshold mesons

Thomas D. Cohen*, Boris A. Gelman, Shmuel Nussinov

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)359-364
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume578
Issue number3-4
DOIs
StatePublished - 8 Jan 2004

Funding

FundersFunder number
Israeli Academy of Science
U.S. Department of EnergyDE-FG02-93ER-40762, DE-FG03-01ER-41196

    Fingerprint

    Dive into the research topics of 'New near-threshold mesons'. Together they form a unique fingerprint.

    Cite this