scholarly journals Models of Bjorken Scaling Violation

2013 ◽  
Vol 63 (0) ◽  
pp. 280-324
Author(s):  
K.-i. Matumoto ◽  
T. Muta ◽  
T. Tajima
Keyword(s):  
Bjorken Scaling

scholarly journals A Generalization of Bjorken Scaling

1976 ◽  
Vol 55 (3) ◽  
pp. 983-984 ◽  
Author(s):  
T. Muta
Keyword(s):  
Bjorken Scaling

The breaking of Bjorken scaling in the covariant parton model

1976 ◽  
Vol 108 (2) ◽  
pp. 253-264 ◽  
Author(s):  
J.C. Polkinghorne
Keyword(s):  
Parton Model ◽  
Bjorken Scaling

Models of Bjorken Scaling Violation

1978 ◽  
Vol 63 ◽  
pp. 280-324 ◽  
Author(s):  
Ken-iti Matumoto ◽  
Taizo Muta ◽  
Toshihiko Tajima
Keyword(s):  
Bjorken Scaling

scholarly journals A Measurement of g2p at Low Q2

2016 ◽  
Vol 40 ◽  
pp. 1660025
Author(s):  
M. Cummings
Keyword(s):  
Electron Scattering ◽  
Resonance Region ◽  
Current Status ◽  
Transverse Spin ◽  
Neutron Data ◽  
Sum Rule ◽  
Jefferson Lab ◽  
Bjorken Scaling ◽  
Wide Range ◽  
Spin Polarizability

Jefferson Lab has been at the forefront of a program to study the polarized structure of nucleons using electron scattering. Measurements of the spin dependent structure functions, [Formula: see text] and [Formula: see text], have proven to be powerful tools in testing and understanding QCD. The neutron structure function [Formula: see text] has been measured extensively in Hall A at Jefferson Lab over a wide range of [Formula: see text], but data for [Formula: see text] remains scarce. This docment will discuss the [Formula: see text] experiment, which ran in Hall A at Jefferson Lab in the spring of 2012, and will provide the first measurement of [Formula: see text] in the resonance region; covering [Formula: see text] GeV2. The 0[Formula: see text] moment of [Formula: see text] provides a test of the Burkhardt-Cottingham sum rule, which states that the integral of [Formula: see text] over the Bjorken scaling variable [Formula: see text] goes to zero. This sum rule, valid for all values of [Formula: see text], has been satisfied for the neutron, but a violation is suggested for the proton at high [Formula: see text]. The 2[Formula: see text] moment allows for a benchmark test of [Formula: see text]PT at low [Formula: see text]. Specifically, the behavior of the longitudinally-transverse spin polarizability ([Formula: see text]), as [Formula: see text]PT calculations of this quantity deviate significantly from the measured neutron data. This document will discuss the current status of the analysis along with preliminary results.

QCD JETS AT HERA I.: O(αs) RADIATIVE CORRECTIONS TO ELECTROWEAK CROSS SECTIONS AND JET RATES

1989 ◽  
Vol 04 (07) ◽  
pp. 1781-1825 ◽  
Author(s):  
JÜRGEN G. KÖRNER ◽  
ERWIN MIRKES ◽  
GERHARD A. SCHULER
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Neutral Current ◽  
High Energy ◽  
Coupling Constant ◽  
Bjorken Scaling ◽  
Born Cross Section ◽  
Wide Range ◽  
Lepton Polarization ◽  
Jet Cross Sections

We present the complete O(αs) corrections to the electroweak cross sections of both neutral current and charged current deep inelastic e±p scattering including lepton polarization effects. Changes in the cross section due to the inclusion of next-to-leading-log (NLL) effects are parametrized by K factors, which are defined as the ratio of the NLL O(αs) cross sections and the Born cross section. Using the standard redefinition scheme of the parton densities, we find that the K factors deviate substantially from unity for small values of the Bjorken-Scaling variable x. We also elaborate on problems that arise when defining jet cross sections in ep scattering and present numerical results for the O(αs) 3-jet and 2-jet rates. We observe that the Q2-dependence of the 3-jet rate is dominated by the running strong coupling constant αs(Q2) allowing for its determination over a wide range in Q2 at high energy ep colliders.

scholarly journals Limiting Fragmentation and Bjorken Scaling in a Baryon Exchange Model

1973 ◽  
Vol 49 (6) ◽  
pp. 2079-2091
Author(s):  
Takeshi Ebata ◽  
Tyuyo Kasahara ◽  
Kenzo Ishikawa ◽  
Tomoya Akiba
Keyword(s):  
Exchange Model ◽  
Bjorken Scaling ◽  
Limiting Fragmentation

NEW SCALING VARIABLE FROM LIGHT-CONE PERTURBATION THEORY

1991 ◽  
Vol 06 (03) ◽  
pp. 345-363 ◽  
Author(s):  
BO-QIANG MA ◽  
JI SUN
Keyword(s):  
Perturbation Theory ◽  
Power Law ◽  
Light Cone ◽  
Operator Product Expansion ◽  
Free Field ◽  
Field Operator ◽  
Order Effect ◽  
Operator Product ◽  
Bjorken Scaling ◽  
Twist Effect

We argue from both the quark language and the free field light-cone expansion in light-cone perturbation theory that the constraint of overall “energy” conservation in deep inelastic lepton-nucleon scattering yields a similar new scaling variable xp, which reduces to the Weizmann variable, the Bloom-Gilman variable and the Bjorken variable at some approximations. The xp rescaling is expected to be a good scaling variable, and hence gives strong power-law type corrections to the deviations of Bjorken scaling. An understanding of this xp rescaling from both the free field operator product expansion (OPE) and the ordinary OPE is also given, indicating it is likely a higher order effect in the coefficient functions, i.e. it does not belong to the higher twist effect. Therefore this xp rescaling is likely a new effect contributing to the power-law type corrections.

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