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

Boroun, G. R.

doi:10.1088/1674-1137/abf1de

Cited by 8 publications

(3 citation statements)

References 85 publications

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“…1 we observe that the maximum value for the top reduced cross section is obtained at Q 2∼ =5m 2 t . Importance of top quark longitudinal structure function measurements [46] at future circular collider energies are considered in Fig. 2.…”

Section: Resultsmentioning

confidence: 99%

Collinear approach for top quark production at ep colliders

Boroun¹

2021

Preprint

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An analysis study of the collinear approach for tt production at the Future Circular Collider hadron-electron (FCC-he) is performed. To study the heavy quark production processes, the collinear generalized double asymptotic scaling (DAS) approach at the next-to-next-to-leading order (NNLO) approximation at small Bjorken x values is used. Bounds on the top reduced cross section at the FCC-he center-of-mass energy and at the high inelasticity are derived. Expanding the method to high-values of Q 2 , Q 2 ≥m 2 t , can be considered in the process analysis of new colliders. A nonlinear modification of the evolution of the gluon density for heavy-quark production in DIS is obtained at small x from the parametrization of the proton structure function to include the effects of heavy-quark masses.

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Section: Resultsmentioning

confidence: 99%

Collinear approach for top quark production at ep colliders

Boroun¹

2021

Preprint

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“…In recent years [47,48], the phenomenological various successful methods have examined charm and bottom structure functions. This importance, along with the t-quark density [49,50], can be explored at future circular collider energies.…”

Section: Numerical Resultsmentioning

confidence: 99%

Ratio of the structure functions and the color dipole model bound

Boroun

Rezaei

2019

Nuclear Physics A

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We observe that the DGLAP evolution equations at NNLO analysis predicts a ratio of the structure functions in region of small Bjorken variable x. The ratio FL(x, Q 2 )/F2(x, Q 2 ) is obtained and compared with the prediction of the dipole model and HERA data. In particular we show that this ratio is lower than dipole model bound at high-Q 2 values and it is higher at low-Q 2 values . Then the effect of adding a higher twist term to the description of the ratio FL(x, Q 2 )/F2(x, Q 2 ) for Q 2 < 20 GeV 2 is investigated. Also the bounds are discussed by including charm distribution on FL/F2. We discuss, furthermore, how this ratio can be determine the proton structure function with respect to the reduced cross section at high-y values.

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“…In Refs. [40][41][42][43][44][45] the results for the ratio of heavy quarks structure functions, obtained using the power-like behavior x −δ , can be found. Our calculations show that the collinear DAS predictions rather close to the results obtained due to the geometrical scaling at NNLO approximation.…”

Section: Figmentioning

confidence: 99%

Geometrical scaling of heavy-quark contributions in the low $x$ region

Boroun¹

2022

Preprint

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We describe the determination of the heavy quarks structure functions F QQ 2,L with help of the scaling properties. We observe that the structure functions for inclusive charm and bottom production exhibits geometric scaling at low x. The geometrical scaling means that the heavy quark structure function is a function of only one dimensionless variable τ ≡Q 2 /Q 2 sat (x) including quark mass. These results are valid for any value of δ, being x −δ the behavior of the parton densities at low x. The determination of the heavy quark structure function is presented as a parameterization of the proton structure function F2(x, Q 2 ) and its derivative. Analytical expressions for F QQ 2,L in terms of the effective parameters of the parameterization of F2(x, Q 2 ) ,with respect to the BDH and ASW models, are presented. To study the heavy quark production processes, we use the collinear results in DAS approach. Numerical calculations and comparison with HERA data demonstrate that the suggested method provides reliable F QQ 2 , R cc and σ QQ at low x in a wide range of the low absolute four-momentum transfers squared (4 GeV 2 < Q 2 < 2000 GeV 2 ). Also, in the HERA kinematic range, the ratio ofExpanding the method to low and ultra low values of x can be considered in the process analysis of the LHeC and FCC-eh colliders.

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

Cited by 8 publications

References 85 publications

Collinear approach for top quark production at ep colliders

Collinear approach for top quark production at ep colliders

Ratio of the structure functions and the color dipole model bound

Geometrical scaling of heavy-quark contributions in the low $x$ region

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