By combining recent HERMES data on semi-inclusive DIS π ± -production with the singlet fragmentation function D π + Σ , which is well determined from e + e − data, we are able to extract, for the first time, the flavoured fragmentation functions q=u,d,s will permit the extraction of the polarized parton densities from future polarized SIDIS asymmetry measurements. We study the precision that can be expected in such an extraction.

We propose several T-odd asymmetries in the decay chains of the top squarks $\tilde t_m \to t \tilde \chi^0_k$ and $t\to bW^+\to bl\nu$ and $\tilde\chi^0_k \to l^\pm\tilde l_n^\mp \to l^\pm l^\mp\tilde\chi^0_1$, for $l =e,\mu,\tau$. We calculate the asymmetries within the Minimal Supersymmetric Standard Model with complex parameters $M_1$, $\mu$ and $A_t$. We give the analytic formulae for the decay distributions. We present numerical results for the asymmetries and estimate the event rates necessary to observe them. The largest T-odd asymmetry can be as large as 40%.Comment: 26 pages, 5 figures; misprints corrected; reference adde

Abstract:We study the effects of CP violation in charged Higgs boson production pp → tH ± + X at the LHC, as well as in the charged Higgs boson decays H ± → tb and H ± → W ± H 0 i , i = 1, 2, 3. The study is done in the framework of the type II complex Two Higgs Doublet Model (2HDM) with softly broken Z 2 symmetry. In this model violation of CP invariance is induced by the complex parameter m 2 12 of the tree-level Higgs potential. We calculate the CP violating rate asymmetries for H + and H − production and decays as well as for the combined processes at one-loop level and perform a detailed numerical analysis. All calculations are done with the automatic amplitude generator FeynArts and the calculational tool FormCalc, for which we have written a complete complex 2HDM model file and relevant fortran drivers. The implementation of the complex 2HDM in FeynArts and FormCalc is described. In comparison with the analogous results in the MSSM, all considered CP violating asymmetries are smaller by an order of magnitude and do not exceed 2 ÷ 3%.

We consider semi-inclusive unpolarized DIS for the production of charged kaons and the different possibilities to test the conventionally used assumptions s −s = 0 and D K + −K − d = 0. The considered tests have the advantage that they do not require any knowledge of the fragmentation functions. We also show that measurements of both charged and neutral kaons would allow the determination of the kaon FFs D K + +K − q solely from SIDIS measurements, and discuss the comparison of (Du − D d ) K + −K − obtained independently in SIDIS and e + e − reactions. All analysis are performed in LO and NLO in QCD. The feasibility of the tests to HERMES SIDIS data is considered.PACS. 1 2.38.Bx, 13.85.Ni

We obtain analytical formulae for the cross section and the angular distributions of the b(b) quarks in the process e + e − → tt, with t → W + b (t → W −b ) assuming CP violation in the γtt and Ztt vertices. We present CP violating asymmetries which measure separately the real and imaginary parts of the electroweak dipole moment form factors of the top, d γ (s) and d Z (s) . We give a numerical analysis of these asymmetries within the Minimal Supersymmetric Standard Model with complex parameters. They turn out to be of order < ∼ 10 −3 .