No abstract

No abstract

We report STAR measurements of the longitudinal double-spin asymmetry A LL , the transverse singlespin asymmetry A N , and the transverse double-spin asymmetries A AE and A TT for inclusive jet production at mid-rapidity in polarized p þ p collisions at a center-of-mass energy of

We report the first measurement of the absolute branching fraction for Λ + c → Λe + νe. This measurement is based on 567 pb −1 of e + e − annihilation data produced at √ s = 4.599 GeV, 116 which is just above the Λ + cΛ − c threshold. The data were collected with the BESIII detector at the BEPCII storage rings. The branching fraction is determined to be B(Λ + c → Λe + νe) = 118(3.63±0.38(stat)±0.20(syst))%, representing a significant improvement in precision over the current indirect determination. As the branching fraction for Λ + c → Λe + νe is the benchmark for those of 120 other Λ + c semileptonic channels, our result provides a unique test of different theoretical models, which is the most stringent to date.

No abstract