6 research outputs found
Study of the decay asymmetry parameter and CP violation parameter in the Lambdac+ --> Lambda pi+ decay
Using data from the FOCUS (E831) experiment at Fermilab, we present a new
measurement of the weak decay-asymmetry parameter alpha(Lambdac) in Lambdac -->
Lambda pi decay. Comparing particle with antiparticle decays, we obtain the
first measurement of the CP violation parameter : A =
[alpha(Lambdac)+alpha(antiLambda_c)]/[alpha(Lambdac)-alpha(antiLambda_c)]. We
obtain alpha(Lambdac)=-0.78+-0.16+-0.13 and A = -0.07+-0.19+-0.12 where errors
are statistical and systematic.Comment: 18 pages, to be submitted to Phys. Lett. B For a list of the FOCUS
collaboration, see http://www-focus.fnal.gov/authors.htm
Study of the decay asymmetry parameter and CP violation parameter in the Îc+ â ÎÏ+ decay
Using data from the FOCUS (E831) experiment at Fermilab, we present a new measurement of the weak decay-asymmetry parameter αÎc in Îc+âÎÏ+ decay. Comparing particle with antiparticle decays, we obtain the first measurement of the CP violation parameter AâĄÎ±Îc+α Îc/αÎc-αÎc. We obtain αÎc=-0.78±0.16±0.19 and A=-0.07±0.19±0.24 where errors are statistical and systematic. © 2006 Elsevier B.V. All rights reserved
Search for a pentaquark decaying to pK(s)(0)
AbstractWe present a search for a pentaquark decaying strongly to pKS0 in ÎłN collisions at a center-of-mass energy up to 25 GeV. Finding no evidence for such a state in the mass range of 1470 MeV/c2 to 2200 MeV/c2, we set limits on the yield and on the cross section times branching ratio relative to ÎŁâ(1385)± and Kâ(892)+