Determination of the quadratic slope parameter in eta-->3pi(0) decay.

Citation data:

Physical review letters, ISSN: 0031-9007, Vol: 87, Issue: 19, Page: 192001

Publication Year:
2001
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Citations 47
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Repository URL:
https://scholarworks.umass.edu/che_faculty_pubs/303
PMID:
11690403
DOI:
10.1103/physrevlett.87.192001
Author(s):
W. B. Tippens; S. Prakhov; C. E. Allgower; V. Bekrenev; E. Berger; W. J. Briscoe; M. Clajus; J. R. Comfort; K. Craig; A. Efendiev; D. Grosnick; B. R. Holstein; G. M. Huber; D. Isenhower; N. Knecht; D. Koetke; A. Koulbardis; N. Kozlenko; S. Kruglov; G. J. Lolos; I. Lopatin; D. M. Manley; A. Marušić; R. Manweiler; S. McDonald; B. M. K. Nefkens; J. Olmsted; Z. Papandreou; N. Phaisangittisakul; J. W. Price; M. Pulver; A. F. Ramirez; M. E. Sadler; A. Shafi; H. Spinka; S. Stanislaus; A. Starostin; H. M. Staudenmaier Show More Hide
Publisher(s):
American Physical Society (APS)
Tags:
Physics and Astronomy
article description
We have determined the quadratic slope parameter alpha for eta-->3pi(0) to be alpha = -0.031(4) from a 99% pure sample of 10(6)eta-->3pi(0) decays produced in the reaction pi(-)p-->n(eta) close to the eta threshold using the Crystal Ball detector at the AGS. The result is four times more precise than the present world data and disagrees with current chiral perturbation theory calculations by about four standard deviations.