Single transverse spin asymmetry in p↑p → π X and ep↑p → π X
نویسندگان
چکیده
منابع مشابه
General Helicity Formalism for Single and Double Spin Asymmetries in Pp → Π + X *
We consider within a generalized QCD factorization approach, the high energy inclusive polarized process pp → π + X, including all intrinsic partonic motions. Several new spin and k⊥-dependent soft functions appear and contribute to cross sections and spin asymmetries. We present here formal expressions for transverse single spin asymmetries and double longitudinal ones. The transverse single s...
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The cross section data for π inclusive production in pp collisions is considered in a rather broad kinematic region in energy √ s, Feynman variable xF and transverse momentum pT . The analysis of these data is done in the perturbative QCD framework at the next-to-leading order. We find that they cannot be correctly described in the entire kinematic domain and this leads us to conclude that the ...
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where the functions Ga(x1, x2), Eb(x ′ 1, x ′ 2) and Êc(z1, z2) are the twist-3 quantities representing, respectively, the transversely polarized distribution, the unpolarized distribution, and the fragmentation function for the pion. δqa(x) is the transversity distribution in p↑. a, b and c stand for the parton’s species, sum over which is implied. δqa, Eb and Êc are chiral-odd. Corresponding ...
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where x(u) and y(u) are the components of γ(u) in X and Y . Since γ(u) starts and ends at (x0, y0), x(u) starts and ends at x0 and y(u) starts and ends at y0. So x(u) represents an element of π(X,x0) and y(u) represents an element of π(Y, y0). Two paths γ1(u) and γ2(u) represent the same element just in case they are homotopic. Such a homotopy is a map H : I × I → X ×Y with the correct boundary...
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Stanley J. Brodsky and Feng Yuan 3 Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309 RIKEN/BNL Research Center, Building 510A, Brookhaven National Laboratory, Upton, NY 11973 Beijing Institute of Modern Physics, Beijing University, Beijing 100871, People’s Republic of China Abstract The large-x behavior of the transverse-momentum dependent quark distributions i...
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ژورنال
عنوان ژورنال: Nuclear Physics A
سال: 2003
ISSN: 0375-9474
DOI: 10.1016/s0375-9474(03)01070-4