Is $Z_b(10610)$ a Molecular State?

Details Is $Z_b(10610)$ a Molecular State? Is $Z_b(10610)$ a Molecular State?

2012-02-10

arxiv.org/abs/1202.2178v3

Journal of High Energy Physics Volume 2012, Number 4 (2012), 56

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 2 figures, an important reference added; Accepted by JHEP

Scientific paper

10.1007/JHEP04(2012)056

Whether molecular states indeed exist in nature has been disputed for a long time. Several new resonances have been observed in the recent experiments and they seem to be of exotic structures and some of them have been proposed to be molecular states. The very recent observation of $Z_b(10610)[(10608.4\pm 2.0)$ MeV] and $Z_b(10650)[(10653.2\pm 1.5)$ MeV] encourages the interpretation of multi-quark states. In the Beter-Salpeter (BS) approach, we study the possibility if two heavy mesons can form a molecular state by exchanging light mesons. Our results indicate that two heavy mesons can form an isospin singlet (I=0) bound state but cannot form an isospin triplet (I=1) when the contribution of $\sigma-$ exchange is reasonably small, i.e. as the coupling of $\sigma$ with mesons $g_{\sigma}$ takes the value given in previous literatures. Thus we conclude that the newly observed $Z_b(10610)$ should not be a molecular state, but a tetraquark state instead, at most, the fraction of the molecular state in the physical resonance $Z_b(10610)$ is tiny.

Affiliated with

Also associated with

No associations

Rating

Is $Z_b(10610)$ a Molecular State? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Is $Z_b(10610)$ a Molecular State?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Is $Z_b(10610)$ a Molecular State? will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-274677