Transversity and the polarized Drell-Yan process in pp → μ + μ - X. P etr Z ávada Inst. of Physics, Prague (& A.Efremov and O.Teryaev, JINR). SPIN05. Introduction.
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Inst. of Physics, Prague
(& A.Efremov and O.Teryaev, JINR)
Calculation - solid line, data - dashed line
(left) and circles (right)
1 described by interference of axial vector and scalar currents. (st way: interference effects are attributed to quark level only…
technique of integral
Transversity based on the expression… described by interference of axial vector and scalar currents. (
satisfies Soffer bound, in fact it satisfies a new, more strict limit…
Actually, in the present model, in which all spin functions are generated by the SU(6) valence quarks only, the transversity can be expressed in compact form as
where the SU(6) factors are represented by
Accounting for interference effects:
Asymmetry corresponding to described by interference of axial vector and scalar currents. (Useful relations:
Double spin asymmetry defined as:
can be calculated from the transversity distributions:
How many events one needs for discriminating among the curves?
which means roughly
So for one needs at least 104 events in given subsample (bin, interval).
How to understand it?
Forp0>m there mustbe some orbital momentum!
o r b i t a l m o m e n t u m