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Calculation of gluon Distribution Functions in Leading Order by regge-like Behavior at Low-x

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Communications in Theoretical Physics 2005年第5X期44卷 891-896页

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

An approximate analytical form of the gluon distribution function from the derivative F2 proton structure function data at low-x assuming the regge-like behavior of the gluon distribution function at this limit is presented. In this method, we calculate λ and C parameters for each low-x value at several Q^2 values using the scaling violation of the F2 proton structure function. For low-x, A is found to be independent of x within the experimental accuracy. We make use of the leading order Altarelli-Parisi （A-P） evolution equations in our analysis. To test the validity of our new determined gluon distribution functions, we compare them with the QCD parton distribution functions at low-x region.

关键词： regge-like behavior DgLAP equation for gluon low x

Exotic states with QQQ′Q′configuration

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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 configurations,the Schrodinger 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

Considering the heavy-quark distribution functions at low x

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Communications in Theoretical Physics 2023年第10期75卷 71-78页

作者： Elham Karampur g r boroun Department of Physics Razi UniversityKermanshah 67149Iran

In this paper,we investigate the behavior of charm and bottom distribution functions at low x with respect to the parametrization of the gluon distribution function in the framework of the nonlinear gribov–Levin–ryskin–Mueller–Qiu,Zhu-ruan-Shen(gLr-MQ-ZrS)evolution ***,we solve the gLr-MQ-ZrS equation using the parametrization behavior of the gluon distribution *** computed results are compared with the NNPDF3.0,CT14 and grV92 collaborations.

关键词： nonlinear evolution equation heavy quark density low x

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

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

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

Calculation of the gluon Distribution Function Using Alternative Method for the Proton Structure Function

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Communications in Theoretical Physics 2003年第5X期40卷 551-557页

作者： N.ghahramany g.r.boroun PhysicsDepartment ShirazUniversityShiraz71454Iran

A calculation of the proton structure function F2(x,Q^2) is reported with an approximation method that relates the reduced cross section derivative and the F2(x, Q^2) scaling violation at low x by using quadratic form for the structure function. This quadratic form approximation method can be used to determine the structure function F2 (x, Q^2) from the HErA reduced cross section data taken at low x. This new approach can determine the structure functions F2(x,Q^2) with reasonable precision even for low x values which have not been investigated. We observe that the Q^2 dependence is quadratic over the full kinematic covered range. To test the validity of our new determined structure functions, we find the gluon distribution function in the leading order approximation with our new calculation for the structure functions and compare them with the QCD parton distribution functions.

关键词：质子结构函数胶子量子色动力学无弹性散射 QCD 强相互作用

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

A Solution of the DgLAP Equation for gluon Distribution as a Function of F2 and dF2/dlnQ^2 at Low x： the Next-to-Leading Order Analysis

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Chinese Physics Letters 2006年第2期23卷 324-327页

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

We obtain a solution of the DgLAP equation to extract the gluon distribution function from the deep inelastic structure function F2 and its derivative with respect to In Q^2 at low x in the next-to-leading order of perturbation theory. The values of the gluon distribution are found in the range 10^- 4 ≤ x ≤ 10^-2 at Q^2 = 20 geV^2, We test its validity by comparing it with that of glueck, reya and Vogt. The detailed analysis is given for the HErA data.

关键词： F2 BEHAVIOr PrOTON