Determination of the quadratic slope parameter in eta-->3pi(0) decay.
Phys Rev Lett
; 87(19): 192001, 2001 Nov 05.
Article
in En
| MEDLINE
| ID: mdl-11690403
ABSTRACT
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.
Search on Google
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Phys Rev Lett
Year:
2001
Document type:
Article