χ cJ → e + e − decays revisited

B → χ cJ K decays revisited

We demonstrate that exclusive B decays to P-wave charmonium factorize in the non-relativistic limit provided that colour-octet contributions are taken into account , and estimate the branching fractions. Although there are very large uncertainties , we find reasonable parameter choices, where the main features of the data – large corrections to (naive) factorization and suppression of the χ c2 ...

Polarized J / ψ from χ cJ and ψ ′ Decays at the Tevatron

We calculate the partonic cross sections for the hadroproduction of polarized χcJ mesons using the factorization formalism of nonrelativistic QCD. We also describe how the polarization is passed on to the J/ψ mesons in the radiative feed-down χcJ → J/ψ+ γ and in the double-cascade decays of ψ′ mesons via χcJ intermediate states. These represent the missing ingredients needed to predict the pola...

STUDY OF e + e − → ˜χ + 1 ˜χ − 1 → ˜τ+ 1 ντ + ˜τ −

Supersymmetry (SUSY) uniquely opens the possibility to directly connect the Standard Model (SM) with an ultimate unification of the fundamental interactions. A primary goal for linear colliders is a precise measurement of SUSY parameters if it would be discovered at Tevatron or LHC. One of the most challenging signatures in SUSY will be events involving τ leptons. At large tanβ values, we could...

ar X iv : h ep - e x / 05 06 04 5 v 1 2 2 Ju n 20 05 1 Observation of χ cJ → ωω decays

M. Ablikim, J. Z. Bai, Y. Ban, J. G. Bian, X. Cai, H. F. Chen, H. S. Chen, H. X. Chen, J. C. Chen, Jin Chen, Y. B. Chen, S. P. Chi, Y. P. Chu, X. Z. Cui, Y. S. Dai, Z. Y. Deng, L. Y. Dong, Q. F. Dong, S. X. Du, Z. Z. Du, J. Fang, S. S. Fang, C. D. Fu, C. S. Gao, Y. N. Gao, S. D. Gu, Y. T. Gu, Y. N. Guo, Y. Q. Guo, Z. J. Guo, F. A. Harris, K. L. He, M. He, Y. K. Heng, H. M. Hu, T. Hu, G. S. Huan...

Measurement of χ _ { cj } decaying into pn [ over ̄ ] π ^ {