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Semi-Inclusive Charged-Pion Electroproduction off Protons and Deuterons: Cross Sections, Ratios and Access to the Quark-Parton Model at Low Energies | | R. Asaturyan
; R. Ent
; H. Mkrtchyan
; T. Navasardyan
; V. Tadevosyan
; G. S. Adams
; A. Ahmidouch
; T. Angelescu
; J. Arrington
; A. Asaturyan
; O. K. Baker
; N. Benmouna
; C. Bertoncini
; H. P. Blok
; W. U. Boeglin
; P. E. Bosted
; H. Breuer
; M. E. Christy
; S. H. Connell
; Y. Cui
; M. M. Dalton
; S. Danagoulian
; D. Day
; J. A. Dunne
; D. Dutta
; N. El Khayari
; H. C. Fenker
; V. V. Frolov
; L. Gan
; D. Gaskell
; K. Hafidi
; W. Hinton
; R. J. Holt
; T. Horn
; G. M. Huber
; E. Hungerford
; X. Jiang
; M. Jones
; K. Joo
; N. Kalantarians
; J. J. Kelly
; C. E. Keppel
; V. Kubarovsky
; Y. Li
; Y. Liang
; D. Mack
; S. P. Malace
; P. Markowitz
; E. McGrath
; P. McKee
; D. G. Meekins
; A. Mkrtchyan
; B. Moziak
; G. Niculescu
; I. Niculescu
; A. K. Opper
; T. Ostapenko
; P. E. Reimer
; J. Reinhold
; J. Roche
; S. E. Rock
; E. Schulte
; E. Segbefia
; C. Smith
; G. R. Smith
; P. Stoler
; L. Tang
; M. Ungaro
; A. Uzzle
; S. Vidakovic
; A. Villano
; W. F. Vulcan
; M. Wang
; G. Warren
; F. R. Wesselmann
; B. Wojtsekhowski
; S. A. Wood
; C. Xu
; L. Yuan
; X. Zheng
; | | Date: |
8 Mar 2011 | | Abstract: | A large set of cross sections for semi-inclusive electroproduction of charged
pions (pi+-) from both proton and deuteron targets was measured. The data are
in the deep-inelastic scattering region with invariant mass squared W2 > 4 GeV2
and range in four-momentum transfer squared 2<Q2<4(GeV/c)2, and cover a range
in the Bjorken scaling variable 0.2<x<0.6. The fractional energy of the pions
spans a range 0.3<z<1, with small transverse momenta with respect to the
virtual-photon direction, Pt2<0.2 (GeV/c)2. The invariant mass that goes
undetected, Mx or W’, is in the nucleon resonance region, W’<2 GeV. The new
data conclusively show the onset of quark-hadron duality in this process, and
the relation of this phenomenon to the high-energy factorization ansatz of
electron-quark scattering and subsequent quark --> pion production mechanisms.
The x, z and Pt2 dependences of several ratios (the ratios of favored-unfavored
fragmentation functions, charged pion ratios, deuteron-hydrogen and
aluminum-deuteron ratios for pi+ and pi-) have been studied. The ratios are
found to be in good agreement with expectations based upon a high-energy
quark-parton model description. We find the azimuthal dependences to be small,
as compared to exclusive pion electroproduction, and consistent with
theoretical expectations based on tree-level factorization in terms of
transverse-momentum-dependent parton distribution and fragmentation functions.
In the context of a simple model, the initial transverse momenta of d quarks
are found to be slightly smaller than for u quarks, while the transverse
momentum width of the favored fragmentation function is about the same as for
the unfavored one, and both fragmentation widths are larger than the quark
widths. | | Source: | arXiv, 1103.1649 | | Services: | Forum | Review | PDF | Favorites | |
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