The problem of exotic states: view from complex angular momenta

Details The problem of exotic states: view from complex angular momenta The problem of exotic states: view from complex angular momenta

2006-02-16

arxiv.org/abs/hep-ph/0602145v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, Latex; based on talks at HSQCD2005 (St.Petersburg, Russia, September 20 - 24, 2005), NSTAR2005 (Tallahassee, FA, USA,

Scientific paper

Having in mind present uncertainty of the experimental situation in respect to exotic hadrons, it is important to discuss any possible theoretical arguments, pro and contra. Up to now, there are no theoretical ideas which could forbid existence of the exotic states. Theoretical proofs for their existence are also absent. However, there are some indirect arguments for the latter case. It will be shown here, by using the complex angular momenta approach, that the standard assumptions of analyticity and unitarity for hadronic amplitudes lead to a non-trivial conclusion: the S-matrix has infinitely many poles in the energy plane (accounting for all its Riemann sheets). This is true for any arbitrary quantum numbers of the poles, exotic or non-exotic. Whether some of the poles may provide physical (stable or resonance) states, should be determined by some more detailed dynamics.

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