Partial wave analysis of psi(2S) -> p(p)over-bar eta
Citation
Ablikim, M., Achasov, M. N., Albayrak, O., Ambrose, D. J., An, F. F., An, Q. ... BESIII Collaboration. (2013). Partial wave analysis of psi(2S) -> p(p)over-bar eta. Physical Review D, 88 (3). pp.1-8. https://dx.doi.org/10.1103/PhysRevD.88.032010.Abstract
Using a sample of 1.06 x 10(8) psi(2) events collected with the BESIII detector at BEPCII, the decay psi(2S) -> p (p) over bar eta is studied. A partial wave analysis determines that the intermediate state N(1535) with a mass of 1524 +/- 5(-4)(+10) MeV/c(2) and a width of 130(-24-10)(+27+57) MeV/c(2) is dominant in the decay; the product branching fraction is determined to be B(psi(2S) -> N(1535)(p) over bar x B(N(1535) -> p eta + c.c. = 5.2 +/- 0.3(-1.2)(+3.2)) x 10(-5). Furthermore, the branching fraction of psi(2S) -> p (p) over bar eta is measured to be (6.4 +/- 0.2 +/- 0.6) x 10(-5). Here, the first error is statistical and the second is systematic.
