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Dissertation Information for Anton V Konychev

NAME:
- Anton V Konychev

DEGREE:
- Ph.D.

DISCIPLINE:
- Physics

SCHOOL:
- Indiana University (USA) (2005)

ADVISORS:
- Timothy Londergan

COMMITTEE MEMBERS:
- Adam P. Szczepaniak
- Micheal S Berger
- Steven E Vigdor
- Pavel M Nadolsky

MPACT Status: Incomplete - Not_Inspected

Title: Large impact parameters in the Collins-Soper-Sterman resummation formalism

Abstract: When there are two large disparate scales involved, perturbative QCD cross sections may receive large corrections. These corrections spoil the convergence of the perturbative expansion. A well-known example is the Drell-Yan process cross section differential with respect to the transverse momentum of the lepton pair. When q T << Q , with Q being the invariant mass of the lepton pair and q T its transverse momentum, the cross section at n -th order of perturbation theory has large contributions [Special characters omitted.] , with m = 0, 1...2 n - 1. These contributions have to be summed through all orders to obtain a reliable theoretical prediction for the cross section. The resummation is performed in the impact parameter space ( b -space) and is known as the Collins, Soper, and Sterman resummation, or CSS formalism. In the CSS formalism, the cross section is given by the inverse Fourier transform of the resummed b -space expression. While at small values of b, b [Special characters omitted.] 1 GeV -1 , this expression is determined mostly by perturbative contributions, at larger values of b nonperturbative effects become important. These effects cannot be fully calculated. Over the years different approaches have been employed to address the problem of large b in the CSS formalism. In this dissertation, these approaches are reviewed and compared. Particular attention is given to an approach based on the analytic continuation of the b -space expression to the complex plane ("complex- b " approach). A modification of the complex- b approach is proposed. The original b [low *] approach of Collins, Soper, and Sterman is revisited. An unproved description of the low energy Drell-Yan and Z boson production q T -differential cross sections is presented. The obtained results have direct implications for precision measurements of the W boson mass at the Run-2 Tevatron and LHC.

MPACT Scores for Anton V Konychev

A = 0
C = 0
A+C = 0
T = 0
G = 0
W = 0
TD = 0
TA = 0
calculated 2010-12-13 17:57:02

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