Single Spin Asymmetry in Charmonium Production
نویسندگان
چکیده
منابع مشابه
Single Spin Asymmetry In Inclusive Pion Production ∗
It is shown how the single spin asymmetry observed in inclusive pion production is related, in the helicity basis, to the imaginary part of the product of two different distribution amplitudes, rather than to the usual quark and gluon distribution functions; there is then no reason why it should be zero even in massless perturbative QCD, provided the quark intrinsic motion is taken into account...
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Azimuthal asymmetry of vector-meson production in single-transversely polarized proton-proton collisions (p↑p) is calculated in the string model of particle production. The asymmetry is generated only during fragmentation of a high-energy quark into hadrons. The obtained asymmetry of the ρ is opposite in sign to that of π mesons. On the other hand, an asymmetry appearing during parton scatterin...
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Theoretical analyses of the results on quarkonium production at large transverse momentum (p T) in p¯ p collisions, at the Tevatron have revealed two novel features of the physics of quarkonium production : 1) the contribution of fragmentation of gluons and charm quarks to the cross-section at large p T , and 2) the importance of colour octet components of the quarkonium wave-function. I discus...
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ژورنال
عنوان ژورنال: Few-Body Systems
سال: 2015
ISSN: 0177-7963,1432-5411
DOI: 10.1007/s00601-015-0945-4