TY - JOUR
T1 - Kinematics of current region fragmentation in semi-inclusive deeply inelastic scattering
AU - Boglione, M.
AU - Collins, J.
AU - Gamberg, L.
AU - Gonzalez-Hernandez, J. O.
AU - Rogers, T. C.
AU - Sato, N.
N1 - Funding Information:
We thank Stefan Prestel for discussions about how current and target fragmentation regions are assigned in Monte Carlo event generators, and we thank Piet Mulders for discussions of the Berger criterion. This work was supported by U.S. Department of Energy contracts No. DE-AC05-06OR23177 (T.R., N.S.), under which Jefferson Science Associates, LLC operates Jefferson Lab, No. DE-FG02-07ER41460 (L.G.), and No. DE-SC0013699 (J.C.). M.B. acknowledges the support from ?Progetto di Ricerca Ateneo/CSP? (codice TO-Call3-2012-0103).
PY - 2017/3/10
Y1 - 2017/3/10
N2 - Different kinematical regions of semi-inclusive deeply inelastic scattering (SIDIS) processes correspond to different underlying partonic pictures, and it is important to understand the transition between them. We find criteria in semi-inclusive deeply inelastic scattering (SIDIS) for identifying the current fragmentation region — the kinematical region where a factorization picture with fragmentation functions is appropriate, especially for studies of transverse-momentum-dependent (TMD) functions. This region is distinguished from the central (soft) and target fragmentation regions. The basis of our argument is in the errors in approximations used in deriving factorization. As compared with previous work, we show that it is essential to take account of the transverse momentum of the detected hadron, and we find a much more restricted range for genuine current fragmentation. We show that it is important to develop an extended factorization formulation to treat hadronization in the central region, as well as the current and target fragmentation regions, and to obtain a unified formalism spanning all rapidities for the detected hadron.
AB - Different kinematical regions of semi-inclusive deeply inelastic scattering (SIDIS) processes correspond to different underlying partonic pictures, and it is important to understand the transition between them. We find criteria in semi-inclusive deeply inelastic scattering (SIDIS) for identifying the current fragmentation region — the kinematical region where a factorization picture with fragmentation functions is appropriate, especially for studies of transverse-momentum-dependent (TMD) functions. This region is distinguished from the central (soft) and target fragmentation regions. The basis of our argument is in the errors in approximations used in deriving factorization. As compared with previous work, we show that it is essential to take account of the transverse momentum of the detected hadron, and we find a much more restricted range for genuine current fragmentation. We show that it is important to develop an extended factorization formulation to treat hadronization in the central region, as well as the current and target fragmentation regions, and to obtain a unified formalism spanning all rapidities for the detected hadron.
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U2 - 10.1016/j.physletb.2017.01.021
DO - 10.1016/j.physletb.2017.01.021
M3 - Article
AN - SCOPUS:85009964656
VL - 766
SP - 245
EP - 253
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
ER -