QCD factorization of exclusive processes beyond leading twist: γT* → ρT impact factor with twist three accuracy

被引:65
作者
Anikin, I. V. [2 ]
Ivanov, D. Yu. [3 ]
Pire, B. [1 ]
Szymanowski, L. [4 ]
Wallon, S. [5 ,6 ]
机构
[1] Ecole Polytech, CNRS, CPHT, F-91128 Palaiseau, France
[2] Joint Inst Nucl Res, Bogoliubov Lab Theoret Phys, Dubna 141980, Russia
[3] Sobolev Inst Math, Novosibirsk 630090, Russia
[4] Soltan Inst Nucl Studies, PL-00681 Warsaw, Poland
[5] Univ Paris 11, CNRS, LPT, F-91405 Orsay, France
[6] Univ Paris 06, Fac Phys, F-75252 Paris 05, France
基金
俄罗斯基础研究基金会;
关键词
DEEP INELASTIC-SCATTERING; LIGHT VECTOR-MESONS; DISTRIBUTION AMPLITUDES; QUANTUM CHROMODYNAMICS; POWER CORRECTIONS; ELECTROPRODUCTION; QUARK; GAMMA; BFKL; GPDS;
D O I
10.1016/j.nuclphysb.2009.10.022
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
We describe a consistent approach to factorization of scattering amplitudes for exclusive processes beyond the leading twist approximation. The method involves the Taylor expansion of the scattering amplitude in the momentum space around the dominant light-cone direction and thus naturally introduces an appropriate set of non-perturbative correlators which encode effects not only of the lowest but also of the higher Fock states of the produced particle. The reduction of original set of correlators to a set of independent ones is achieved with the help of equations of motion and invariance of the scattering amplitude under rotation on the light cone. We compare the proposed method with the covariant method formulated in the coordinate space, based on the operator product expansion. We prove the equivalence of two proposed parametrizations of the rho(T) distribution amplitudes. As a concrete application, we compute the expressions of the impact factor for the transition of virtual photon to transversally polarised rho-meson up to the twist 3 accuracy within these two quite different methods and show that they are identical. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码:1 / 68
页数:68
相关论文
共 52 条
[1]  
A Kuraev E., 1977, Sov. Phys. JETP, V45, P199
[2]   Double spin asymmetry in exclusive ρ0 muoproduction at COMPASS [J].
Alekseev, M. ;
Alexakhin, V. Yu. ;
Alexandrov, Yu. ;
Alexeev, G. D. ;
Amoroso, A. ;
Arbuzov, A. ;
Badelek, B. ;
Balestra, F. ;
Ball, J. ;
Baum, G. ;
Barth, J. ;
Bedfer, Y. ;
Bernet, C. ;
Bertini, R. ;
Bettinelli, M. ;
Birsa, R. ;
Bisplinghoff, J. ;
Bordalo, P. ;
Bradamante, F. ;
Bravar, A. ;
Bressan, A. ;
Brona, G. ;
Burtin, E. ;
Bussa, M. P. ;
Chapiro, A. ;
Chiosso, M. ;
Cicuttin, A. ;
Colantoni, M. ;
Costa, S. ;
Crespo, M. L. ;
d'Hose, N. ;
Dalla Torre, S. ;
Das, S. ;
Dasgupta, S. S. ;
De Masi, R. ;
Dedek, N. ;
Denisov, O. Yu. ;
Dhara, L. ;
Diaz, V. ;
Dinkelbach, A. M. ;
Donskov, S. V. ;
Dorofeev, V. A. ;
Doshita, N. ;
Duic, V. ;
Duennweber, W. ;
Eversheim, P. D. ;
Eyrich, W. ;
Fabro, M. ;
Faessler, M. ;
Falaleev, V. .
EUROPEAN PHYSICAL JOURNAL C, 2007, 52 (02) :255-265
[3]   EXCLUSIVE RADIATIVE B-DECAYS IN THE LIGHT-CONE QCD SUM-RULE APPROACH [J].
ALI, A ;
BRAUN, VM ;
SIMMA, H .
ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS, 1994, 63 (03) :437-454
[4]   On the description of exclusive processes beyond the leading twist approximation [J].
Anikin, I. V. ;
Ivanov, D. Yu ;
Pire, B. ;
Szymanowski, L. ;
Wallon, S. .
PHYSICS LETTERS B, 2010, 682 (4-5) :413-418
[5]  
Anikin IV, 2009, ACTA PHYS POL B, V40, P2131
[6]  
Anikin IV, 2009, AIP CONF PROC, V1105, P390, DOI 10.1063/1.3122219
[7]  
Anikin I.V., ARXIV09094042HEPPH
[8]  
Anikin I.V., UNPUB
[9]   Genuine twist 3 in exclusive electroproduction of transversely polarized vector mesons [J].
Anikin, IV ;
Teryaev, OV .
PHYSICS LETTERS B, 2003, 554 (1-2) :51-63
[10]  
Anikin IV, 2002, NUCL PHYS A, V711, p199C, DOI 10.1016/S0375-9474(02)01216-2