Observation of an exotic S = +1 baryon in exclusive photoproduction from the deuteron

Stepanyan, S.; Hicks, K.; Carman, D.S.; Pasyuk, E.; Schumacher, R.A.; Smith, E.S.; Tedeschi, D.J.; Todor, L.; Adams, G.; Ambrozewicz, P.

doi:10.1103/PhysRevLett.91.252001

Observation of an exotic S = +1 baryon in exclusive photoproduction from the deuteron

CLAS

Collaboration

Jul, 2003

5 pages

Published in:

Phys.Rev.Lett. 91 (2003) 252001

e-Print:

hep-ex/0307018 [hep-ex]

DOI:

10.1103/PhysRevLett.91.252001

Report number:

JLAB-PHY-03-132

Experiments:

JLAB-E-89-004

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Abstract:

In an exclusive measurement of the reaction

\gamma d \to K^+ K^- p n

, a narrow peak that can be attributed to an exotic baryon with strangeness

S=+1

is seen in the

K^+n

invariant mass spectrum. The peak is at

1.542\pm 0.005

GeV/c

^2

with a measured width of 0.021 GeV/c

^2

FWHM, which is largely determined by experimental mass resolution. The statistical significance of the peak is

5.2 \pm 0.6 \sigma

. The mass and width of the observed peak are consistent with recent reports of a narrow

S=+1

baryon by other experimental groups.

photon deuteron: inelastic scattering
K: pair production
mass spectrum: (n K+)
baryon resonance: exotic
strangeness: 1
Theta(1540): width
pentaquark
magnetic spectrometer: experimental results
Newport News CEBAF Linac
photon deuteron --> n p K+ K-

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