منابع مشابه
Refining threshold resummations
We describe some recent refinements of the techniques of threshold resummation, with emphasis on the usefulness of dimensional regularization when applied to nonabelian exponentiation. Threshold resummation is now under theoretical control for DIS and electroweak annihilation cross sections all the way to the fourth tower of logarithms and up to corrections suppressed by powers of the threshold...
متن کاملkT and threshold resummations
We demonstrate that both the kT and threshold resummations can be performed in the Collins-Soper resummation formalism by evaluating soft gluon emissions with infrared cutoffs for the longitudinal and transverse loop momenta, respectively. The reason the kT resummation for a parton distribution function leads to suppression in the large b region, b being the conjugate variable of parton transve...
متن کاملOn the kT and threshold resummations
We demonstrate that both the kT and threshold resummations can be performed in the Collins-Soper resummation formalism by evaluating soft gluon emissions with infrared cutoffs for the longitudinal and transverse loop momenta, respectively. The reason the kT resummation for a parton distribution function leads to suppression in the large b region, b being the conjugate variable of the parton tra...
متن کاملUnification of the K T and Threshold Resummations
We derive a resummation formula for a k T-dependent parton distribution function at threshold, where k T is a parton transverse momentum. The derivation requires infrared cutoffs for both longitudinal and transverse loop momenta as evaluating soft gluon emissions in the Collins-Soper resummation framework. This unified resummation exhibits suppression at large b, b being the conjugate variable ...
متن کاملResummations in PDF fits
In this contribution I discuss recent and ongoing progress on the inclusion of resummation effects in the fit of parton distributions. Current state-of-the-art PDF sets [1, 2, 3, 4, 5, 6, 7] are fitted from data assuming fixed-order theory at LO, NLO or NNLO. The DGLAP evolution is consistently included at LL, NLL or NNLL, respectively. The quest for precision at the LHC often requires theoreti...
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 2006
ISSN: 0920-5632
DOI: 10.1016/j.nuclphysbps.2006.09.113