scholarly journals Application of the rescaling model at small Bjorken x values

2017 ◽  
Vol 96 (11) ◽  
Author(s):  
A. V. Kotikov ◽  
B. G. Shaikhatdenov ◽  
Pengming Zhang
Keyword(s):  
Bjorken X

scholarly journals CRITICAL PHENOMENA IN DEEP INELASTIC SCATTERING

2010 ◽  
Vol 25 (31) ◽  
pp. 5667-5682 ◽  
Author(s):  
L. L. JENKOVSZKY ◽  
ANDREA NAGY ◽  
S. M. TROSHIN ◽  
JOLÁN TURÓCI ◽  
N. E. TYURIN
Keyword(s):  
Phase Transition ◽  
Inelastic Scattering ◽  
Deep Inelastic Scattering ◽  
Deeply Virtual Compton Scattering ◽  
Virtual Compton Scattering ◽  
Heavy Ion ◽  
High Energy ◽  
Ion Collisions ◽  
Bjorken X ◽  
Insight Into

Saturation in deep inelastic scattering and deeply virtual Compton scattering is associated with a phase transition between the partonic gas, typical of moderate x and Q2, and partonic fluid appearing at increasing Q2 and decreasing Bjorken x. In this paper we do not intend to propose another parametrization of the structure function; instead we suggest a new insight into the internal structure of the nucleon, as seen in deep inelastic scattering, and its connection with that revealed in high-energy nucleons and heavy-ion collisions.

scholarly journals EMC effect at small Bjorken x values

2019 ◽  
Vol 204 ◽  
pp. 05002
Author(s):  
A. Kotikov ◽  
B. Shaikhatdenov ◽  
P. Zhang
Keyword(s):  
Strong Coupling ◽  
Gluon Density ◽  
Strong Coupling Constant ◽  
Coupling Constant ◽  
Emc Effect ◽  
Bjorken X

The Bessel-inspired behavior of parton densities at small Bjorken x values is used along with “frozen” and analytic modifications of the strong coupling constant [1] to study the so-called EMC effect. Among other results, this approach allowed predicting small x behavior of the gluon density in nuclei.

scholarly journals STRUCTURE FUNCTIONS

2009 ◽  
Vol 24 (06) ◽  
pp. 1069-1086 ◽  
Author(s):  
CRISTINEL DIACONU
Keyword(s):  
Cross Sections ◽  
Structure Functions ◽  
Distribution Functions ◽  
Final States ◽  
Parton Distribution Functions ◽  
Proton Antiproton ◽  
Proton Proton ◽  
Proton Collisions ◽  
Bjorken X ◽  
Proton Proton Collisions

Recent progress in the understanding of the nucleon is presented. The unpolarized structure functions are obtained with unprecedented precision from the combined H1 and ZEUS data and are used to extract proton parton distribution functions via NLO QCD fits. The obtained parametrization displays an improved precision, in particular at low Bjorken x, and leads to precise predictions of cross-sections for LHC phenomena. Recent data from proton–antiproton collisions at Tevatron indicate further precise constraints at large Bjorken x. The flavor content of the proton is further studied using final states with charm and beauty in DIS ep and [Formula: see text] collisions. Data from polarized DIS or proton–proton collisions are used to test the spin structure of the proton and to constrain the polarized parton distributions.

scholarly journals QCD AND QED DYNAMICS IN THE EMC EFFECT

2012 ◽  
Vol 21 (04) ◽  
pp. 1230002 ◽  
Author(s):  
LEONID FRANKFURT ◽  
MARK STRIKMAN
Keyword(s):  
Structure Function ◽  
Degrees Of Freedom ◽  
Experimental Studies ◽  
Momentum Conservation ◽  
Light Nuclei ◽  
Heavy Nuclei ◽  
Fermi Motion ◽  
Nucleon Wave Function ◽  
Emc Effect ◽  
Bjorken X

Applying exact QCD sum rules for the baryon charge and energy–momentum conservation we demonstrate that if the only degrees of freedom in nuclei were nucleons, the structure function of a nucleus would be the additive sum of the nucleon distributions at the same Bjorken x = AQ2/2(pA⋅q)≤0.5 up to very small Fermi motion corrections if 1/2mN x is significantly less than the nucleus radius. Hence QCD implies that the proper quantity to reveal violation of the additivity due to presence of nonnucleonic degrees of freedom in nuclei is the ratio RA(x, Q2) = (2/A)F2A(x, Q2)/F2D(x, Q2). Use of variable xp = Q2/2q0mp in the experimental studies instead of x leads to the deviation of RA(xp, Q2) from one even if the nucleus would consist only of nucleons with small momenta. Implementation of QCD dynamics accounts in the case of the light nuclei for at least a half of the deviation of RA(xp, Q2) from one for x≤0.55. In the case of heavy nuclei account of the QCD dynamics and of light-cone momentum fraction carried by Fermi, Weizsacker, Williams equivalent photons are responsible for ≈ one half the deviation of RA(x, Q2) from one at x≤0.55. We argue that direct observation of large and predominantly nucleonic short-range correlations (SRCs) in nuclei impacts strongly on the understanding of the EMC effect for x≥0.6 posing a serious challenge for most of the proposed models of the EMC effect. The data are consistent with a scenario in which the hadronic EMC effect reflects suppression of rare quark–gluon configurations in nucleons belonging to SRC appears to be the only viable. The dynamic realization of this scenario is presented in which quantum fluctuations of the nucleon wave function with x≥0.5 parton have a weaker interaction with nearby nucleons, leading to suppression of such configurations in bound nucleons and to the significant suppression of nucleon Fermi motion effects at x≥0.55 giving a right magnitude of the EMC effect. Implications of discussed effects for the analyses of the neutron structure function and nuclear parton distributions are presented. The directions for the future studies and challenging questions are outlined.

scholarly journals Deuteron spin structure functions at small Bjorken x

1998 ◽  
Vol 57 (6) ◽  
pp. 3392-3405 ◽  
Author(s):  
J. Edelmann ◽  
G. Piller ◽  
W. Weise
Keyword(s):  
Spin Structure ◽  
Structure Functions ◽  
Deuteron Spin ◽  
Spin Structure Functions ◽  
Bjorken X

scholarly journals NEUTRON SPIN STRUCTURE STUDY AT JEFFERSON LAB HALL A

2003 ◽  
Vol 18 (08) ◽  
pp. 1153-1160
Author(s):  
JIAN-PING CHEN
Keyword(s):  
Spin Structure ◽  
Spin Asymmetry ◽  
Valence Quark ◽  
Structure Study ◽  
Precision Measurements ◽  
Neutron Spin ◽  
Higher Twist Effects ◽  
Jefferson Lab ◽  
Neutron Spin Structure ◽  
Bjorken X

With a high-intensity highly-polarized 6 GeV electron beam, and a high-density polarized 3 He target, we have carried out a number of experiments to study the neutron spin structure at Hall A in Jefferson Lab. Taking advantage of the high luminosity of Jefferson Lab, we completed two inclusive deep-inelastic-scattering experiments this summer. In the first precision measurements were made of the spin asymmetry [Formula: see text] in the valence quark (high Bjorken x) region, and in the second higher-twist effects were studied via precision measurements of [Formula: see text]. Physics motivation and preliminary results from the first experiment will be presented and discussed. I will also present nearly final results from an earlier experiment, which measured the generalized GDH sum for the neutron in the Q 2 range of 0.1 to 1 GeV 2. Planned near-term experiments will be briefly discussed.

scholarly journals Estudio holográfico de la estructura hadrónica

2015 ◽  
Author(s):  
◽  
Leandro Ezequiel Koile
Keyword(s):  
Yang Mills ◽  
Bjorken X

En esta Tesis se realiza un estudio pormenorizado de la dispersión inelástica profunda (DIS) de leptones por mesones para acoplamiento fuerte y en el límite planar a partir de modelos duales basados en la correspondencia AdS/CFT. Se estudia la estructura de mesones escalares y mesones vectoriales en su polarización más general, con grados de libertad de sabor en el contexto de los modelos de D3D7-branas en la teoría de supercuerdas del tipo IIB y de D4D8D8- y D4D6D6-branas en la teoría de supercuerdas del tipo IIA. El primer caso se trata de una teoría de gauge en 3+1 dimensiones que preserva N = 2 supersimetrías, mientras que los últimos dos corresponden a teorías de Yang-Mills no supersimétricas. Se estudian los límites del parámetro de Bjorken x del orden de 1, que requiere de una descripción de supergravedad, y el límite x mucho menor que 1, para el cual los cálculos se deben hacer mediante la teoría de cuerdas. También se estudia la sección eficaz diferencial de dispersión en diversos regímenes de polarización en estos modelos. Se encuentran importantes relaciones entre las distintas funciones de estructura en cada régimen del parámetro x para los distintos modelos estudiados, lo cual sugiere un comportamiento universal.

scholarly journals Extracting many-body color charge correlators in the proton from exclusive DIS at large Bjorken x

2018 ◽  
Vol 98 (9) ◽  
Author(s):  
Adrian Dumitru ◽  
Gerald A. Miller ◽  
Raju Venugopalan
Keyword(s):  
Body Color ◽  
Many Body ◽  
Color Charge ◽  
Bjorken X
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