Bounds on transverse momentum dependent distribution functions
نویسندگان
چکیده
منابع مشابه
Bounds on Transverse Momentum Dependent Distribution Functions
Here, P and S denote the parent hadron momentum and spin, and the relevant component of the quark momentum is x = p/P, the light-cone momentum fraction. The components a = a · n∓ stem from vectors n+ and n−, satisfying n2+ = n 2 − = 0 and n+ ·n− = 1, which are fixed by the momentum that introduces the large scaleQ, together with a (soft) hadron momentum. When only the leading part in orders of ...
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We give bounds on the distribution and fragmentation functions that appear at leading order in deep inelastic one-particle inclusive leptoproduction or in Drell-Yan processes. These bounds simply follow from positivity of the defining matrix elements and are an important guidance in estimating the magnitude of the azimuthal and spin asymmetries in these processes.
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In deep-inelastic processes the transition from hadrons to quarks and gluons is described in terms of distribution and fragmentation functions. For instance, at leading order in the inverse hard scale 1/Q, the cross section for inclusive electroproduction e−H → e−X is given as a charge squared weighted sum over quark distribution functions, which describe the probability of finding quarks in ha...
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In the field theoretical description of hadronic scattering processes, single transverse-spin asymmetries arise due to gluon initial and final state interactions. These interactions lead to process dependent Wilson lines in the operator definitions of transverse momentum dependent parton distribution functions. In particular for hadron–hadron scattering processes with hadronic final states this...
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We use Lorentz invariance and the QCD equations of motion to study the evolution of functions that appear at leading order in a 1/Q expansion in azimuthal asymmetries. This includes the evolution equation of the Collins fragmentation function. The moments of these functions are matrix elements of known twist two and twist three operators. We present the evolution in the large Nc limit, restrict...
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ژورنال
عنوان ژورنال: Czechoslovak Journal of Physics
سال: 2001
ISSN: 0011-4626,1572-9486
DOI: 10.1007/s10582-001-0015-7