Some comments on the putative Theta+ (1543) exotic state

Nussinov, S.

Some comments on the putative Theta+ (1543) exotic state

S. Nussinov
(
- South Carolina U.
)

Jul, 2003

10 pages

e-Print:

hep-ph/0307357 [hep-ph]

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Abstract:

We point out that existing

K^+d

scattering data available in the PDG (Particle Data Group compilation) suggest some fluctuations in those momentum bins where the (Fermi motion broadened)

\Theta^+

[1543] resonance recently indicated in many gamma nuclear reactions and predicted six years ago by Diakonv Petrov and Polyakov might have shown up. The I=0,

J^P={1/2}^+

P-wave channel should have a universal peak cross section of

\sim 37

mb at resonance. The smallness of the effect seen in

K^+d

with the

\delta \sigma

fluctuations being less than 4 mb imply an indirect bound

\Gamma_{\Theta^+} < 6

MeV, far stronger than the direct gamma-d measurements. This renders the theoretical interpretation of the new state very difficult.

baryon resonance: exotic
Theta(1540): width
photon deuteron: inelastic scattering
K+ deuteron: interaction
K nucleon: interaction
baryon resonance: width
isospin
interpretation of experiments

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