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Calculation of the Longitudinal Structure Function from regge-Like Behaviour of the gluon Distribution Function in Leading Order Approximation at Low x

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Chinese Physics Letters 2007年第5期24卷 1187-1190页

作者： g.r. boroun B. rezaie Department of Physics Razi University Kermanshah 67149 Iran

We present the calculations of FL longitudinal structure functions from DgLAP evolution equation in leading order （LO） at low-x, assuming the regge-like behaviour of gluon distribution at this limit. The calculated results are compared with the H1 data and QCD fit. It is shown that the obtained results are very close to the mentioned methods. The proposed simple analytical relation for EL provides a t-evolution equation for the determination of the longitudinal structure function at low-x. All the results can consistently be described within the framework of perturbative QCD, which essentially shows increases as x decreases.

关键词： PrOTON

Longitudinal Structure Function FL from Charm Structure Function F2^c

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Communications in Theoretical Physics 2013年第4期59卷 462-466页

作者： B. rezaei g.r. boroun Physics Department Razi University

We predict the effect of the charm structure function on the longitudinal structure function at small x. In NLO analysis we find that the hard Pomeron behavior gives a good description of FL and Fk^c （k = 2, L） at small x values. We conclude that a direct relation between FL∝ F2^c would provide useful information on how to measure longitudinal structure function at high 0,2 values. Having checked that this model gives a good description of the data, when compared with other models.

关键词： charm structure function gluon distribution quantum chromodynamics small-x

Nonlinear corrections for the nuclear gluon distribution in eA processes

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Chinese Physics C 2024年第3期48卷 52-64页

作者： g.r.boroun B.rezaei F.Abdi Department of Physics Razi UniversityKermanshah 67149Iran.

An analytical study with respect to the nonlinear corrections for the nuclear gluon distribution function in the next-to-leading order approximation at small x is *** consider the nonlinear corrections to the nuclear gluon distribution functions at low values of x and Q^(2) using the parametrization F_(2)(x,Q^(2))and the nuclear modification factors obtained from the Khanpour-Soleymaninia-Atashbar-Spiesberg.r.guzey *** CT18 gluon distribution is used for the baseline proton gluon density at Q^(2)_(0)=*** discuss the behavior of the gluon densities in the next-to-leading order and the next-to-next-to-leading order approximations at the initial scale Q^(2)_(0),as well as the modifications due to the nonlinear *** find that the QCD nonlinear corrections are more significant for the next-to-leading order accuracy than the next-to-next-to-leading order for light and heavy *** results of the nonlinear g.r.MQ evolution equation are similar to those obtained with the rausch-guzey-Klasen gluon upward and downward evolutions within the *** magnitude of the gluon distribution with the nonlinear corrections increases with a decrease in x and an increase in atomic number A.

关键词： gluon distribution nonlinear corrections light and heavy nuclei low x physics

Analysis of the Longitudinal Structure Function F_L from the Non-linear regge gluon Density Behavior at Low-x

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Chinese Physics Letters 2015年第11期32卷 18-21页

作者： boroun g.r. rEZAEI B. Physics Department Razi University

The longitudinal structure function with shadowing correction according to the nonlinear effects of the gluon density behavior at low x is considered. The solution of the g.r.MQ evolution equation for the gluon density shows that the FL^g（x, Q2） behavior can be tamed by the singularity at low x values. Comparing our results with H1 data at r=4 geV-1 shows that at very low x this behavior is completely tamed by taking shadowing correction into account.

关键词： Analysis of the Longitudinal Structure Function F_L from the Non-linear regge gluon Density Behavior at Low-x

Importance of heavy quark longitudinal structure function measurements at future circular collider energies

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Chinese Physics C 2021年第6期45卷 56-65页

作者： g.r.boroun Physics Department Razi UniversityKermanshah 67149Ira

In this article,we consider the ratio of structure functions for heavy quark pair production at low values *** importance of this ratio for charm and beauty pair production is examined according to the Hadron Electron ring Accelerator(HErA)*** behavior of these ratios is considered due to the hard pomeron behavior of the gluon distribution *** results are in good agreement with the HErA *** this data to the range of new energies underscores the importance of these measurements for heavy *** ratio of charm and beauty structure functions at the proposed Large Hadron electron Collider(LHeC)is considered as a function of invariant center-of-mass *** top pair production this ratio is extracted with known kinematics of the LHeC and Future Circular Collider electron-hadron(FCC-eh)*** of the results obtained for the ratio of top structure functions in LHeC and FCC-eh are proportional to the specified inelasticity range.

关键词： future circular colliders heavy quarks longitudinal structure function

Exotic states with QQQ′Q′config.r.tion

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Communications in Theoretical Physics 2023年第3期75卷 56-61页

作者： Z Asadi g.r.boroun Department of Physics Razi UniversityKermanshah 67149Iran

In the framework of a non-relativistic quark model,we have calculated the masses of the QQQ′Q′(Q=c,b,s and Q′=c,b,s)tetraquark *** the linear and quadratic confinement potentials inside a Cornell-type potential along with all possible spin and color config.r.tions,the Schroding.r.equation masses of these tetraquark states have been *** on our numerical analysis,linear confinement and quadratic confinement produce acceptable *** that use linear confinement estimate charmonium-like tetraquark mass close to experimental data,as well as bottomonium-like tetraquark mass below the threshold of their meson-meson channels.

关键词： tetraquark quark model non-relativistic charmonium-like bottomonium-like

Top reduced cross section behavior at the LHeC kinematic range

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Chinese Physics C 2017年第1期41卷 72-76页

作者： g.r.boroun Physics Department Razi University Kermanshah 67149 Iran

The linear and non-linear behavior of the top reduced cross section in the LHe C region is considered concerning the boson-gluon fusion（BgF） model for deep inelastic scattering leptoproduction. We show that the non-linear behavior in this region for the tt production is very small. The behavior of the top reduced cross section and the ratio r^t in these processes are also considered.

关键词： Top reduced cross section nonlinearity low x behavior

Extraction of Structure Function and gluon Distribution Function at Low-x from Cross Section Derivative by regge Behavior

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Communications in Theoretical Physics 2005年第2期43卷 283-286页

作者： g.r.boroun PhysicsDepartment RaziUniversityKermanshah67149Iran

An approximation method based on regge behavior is presented. This new methodrelates the reduced cross section derivative and the structure function regge behavior at low *** the use of this approximation method, the C and λ parameters are calcuiated from the HErAreduced cross section data taken at low-x. Also, we calculate the structure functions F_2(x, Q~2)even for low-x values, which have not been investigated. To test the validity of calculatedstructure functions, we find the gluon distribution function in the Leading order approximationbased on regge behaviour of structure function and compare to the NLO QCD fit to H1 data and NLOparton distribution function.

关键词： regge behavior cross section gluon distribution structure function

Universal function of the diffractive process in color dipole picture

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Chinese Physics C 2021年第2期45卷 111-118页

作者： Z.Jalilian g.r.boroun Department of Physics Razi UniversityKermanshah67149Iran

In this study,we obtain the universal function corresponding to the diffractive process and show that the cross section exhibits geometrical *** is observed that diffractive theory according to the color dipole approach at small-x is a convenient framework that reveals the color transparency and saturation *** also calculate the contribution of heavy quark production in the diffractive cross section at high energy that is determined by the small size dipole *** ratio of the diffractive cross section to the total cross section in electron-proton collision is the other important quantity that is computed in this work.

关键词： universal function structure function cross section color dipole model diffractive process