Measurement of the mass and width of the Λc (2625)+ charmed baryon and the branching ratios of Λc (2625)+→ Σc0π+ and Λc (2625)+ → Σc++π-
Abstract
Using the entire data sample of 980 fb(-1) collected at or near the gamma(4S) resonance with the Belle detector operating at the KEKB asymmetric-energy e(+)e(-) collider, we report the measurement of the mass, width, and the branching ratios of the Lambda(c) (2625)(+) charmed baryon. The mass difference between Lambda(c)(2625)(+) and Lambda(+)(c) is measured to be M(Lambda(c)(2625)(+)) - M(Lambda(+)(c)) = 341.518 +/- 0.006 +/- 0.049 MeV/c(2).
The upper limit on the width is measured to be Gamma(Lambda(c)(2625)(+)) Lambda(+)(c)pi(+)pi(-) are measured to be B(Lambda(c) (2625)(+)->Sigma(0)(c)pi(+))/B(Lambda(c) (2625)(+)-> Lambda(+)(c) pi(+)pi(-)) = (5.19 +/- 0.23 +/- 0.40)% and B(Lambda(c) (2625)(+)->Sigma(++)(c)pi(-))/B(Lambda(c) (2625)(+)-> Lambda(+)(c) pi(+)pi(-)) = (5.13 +/- 0.26 +/- 0.32)% where the first and second uncertainties are statistical and systematic, respectively. These measurements can be used to further constrain the parameters of the underlying theoretical models.