High-Resolution Search for Pentaquark Partners in Hall A at Jefferson Lab

Journal Article · Sat Feb 11 04:00:00 EST 2006 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2176497· OSTI ID:20798084

Hansen, J -O ^[1]

---

1. Jefferson Lab, Newport News, Virginia 23606 (United States)

We have carried out a high-resolution search ({sigma} = 1.5 MeV) for narrow exotic resonances ({gamma} < 10 MeV) in the mass range M {approx_equal} 1500 - 1850 MeV in ep {yields} e'K+X, ep {yields} e'K-X and ep {yields} e'{pi}+X electroproduction at forward angles ({theta}CM {approx_equal} 6 - 7 deg.). Such narrow resonances would be candidates for partner states of the speculative {theta}+(1540) pentaquark. The experiment employed a 5 GeV CW electron beam incident on a liquid hydrogen target and two high-resolution magnetic spectrometers covering a total center-of-mass solid angle of {delta}{omega} {approx_equal} 30 - 40 msr. We do not observe a statistically significant signal in any of the three reaction channels. Upper limits on the production cross sections were determined to be between 3 and 16 nb/sr, depending on the channel and the assumed width of the state. In addition, precise electroproduction data of the {lambda}(1116), {sigma}(1193) and {lambda}(1520) resonances were obtained for calibration purposes.

• OSTI ID: 20798084
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 814; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CALIBRATION
CEBAF ACCELERATOR
CROSS SECTIONS
ELECTRON BEAMS
ELECTRON-PROTON INTERACTIONS
ELECTROPRODUCTION
EXOTIC RESONANCES
GEV RANGE
HYDROGEN
LAMBDA-1520 BARYONS
MAGNETIC SPECTROMETERS
MESONS
MEV RANGE
PARTICLE IDENTIFICATION
PARTICLE WIDTHS
QUARKS
RESOLUTION