Higher-twist effects in the direct photon production and the role of infrared renormalons

Ahmadov, A. I.; Aydin, C.; Uzun, Özlem

doi:10.1103/physrevd.87.014006

Cited by 6 publications

(1 citation statement)

References 52 publications

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“…in Refs. [12][13][14][15][16], and will be taken into account in our considerations. η can be described on either flavor octet-singlet or quark-flavor basis, however for η ′ the gluonium content may have a role in the interaction.…”

Section: Introductionmentioning

confidence: 99%

Understanding the cross section ofe+e−→ηJ/ψprocess via nonrelativistic QCD

Qiao

Zhu

2014

Phys. Rev. D

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Motivated by the large cross section of e + e − → ηJ/ψ process measured by the BESIII and Belle Collaborations recently, we evaluate this process at O(α 4 s ) accuracy in the framework of nonrelativistic QCD. We find that the cross section at the center-of-mass energy √ s = 4.009 GeV is 34.6pb, which is consistent with the BESIII data. The comparison with the Belle data in the region from 4.0 GeV to 5.3 GeV is also presented. Concerning the η and η ′ mixing and the potential gluonium component of η ′ , we also estimate the rate of e + e − → η ′ J/ψ process, which can be checked within the updated Belle data.

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Section: Introductionmentioning

confidence: 99%

Understanding the cross section ofe+e−→ηJ/ψprocess via nonrelativistic QCD

Qiao

Zhu

2014

Phys. Rev. D

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Higher-Twist Mechanism and Inclusive Gluon Production in Pion-Proton Collisions

Ahmadov

Aydin

Myrzakulov

et al. 2016

J. Phys.: Conf. Ser.

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We calculate the contribution of the higher-twist Feynman diagrams to the large-p T inclusive gluon production cross-section in πp collisions in case of the running coupling and frozen coupling approaches within perturbative and holographic QCD. The structure of infrared renormalon singularities of the higher-twist subprocess cross-section is obtained and the resummed higher-twist cross-sections (Borel sum) with the ones obtained in the framework of the frozen coupling approach and leading-twist cross-section are compared and analyzed.

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Inclusive production of charged pion pairs in proton-antiproton collisions

2019

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In this study, we have considered the contribution of the higher-twist (HT) effects of the subprocesses to inclusive pion pair production cross section in the high energy proton-antiproton collisions by using various pion distribution amplitudes (DAs) within the frozen coupling constant approach and compared them with the leading-twist contributions. The feature of the HT effects may help the theoretical interpretation of the future PANDA experiment. The dependencies of the HT contribution on the transverse momentum p T , the center of mass energy √ s, and the variable x T are discussed numerically with special emphasis put on DAs. Moreover, the obtained analytical and numerical results for the differential cross section of the pion pair production are compared with the elastic backward scattering of the pion on the proton. We show that the main contribution to the inclusive cross section comes from the HT direct production process via gluon-gluon fusion.Also, it is strongly dependent on the pion DAs, momentum cut-off parameter △p and < q 2 T > which is the mean square of the intrinsic momentum of either initial parton.

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Higher-twist effects in the direct photon production and the role of infrared renormalons

Cited by 6 publications

References 52 publications

Understanding the cross section ofe+e−→ηJ/ψprocess via nonrelativistic QCD

Understanding the cross section ofe+e−→ηJ/ψprocess via nonrelativistic QCD

Higher-Twist Mechanism and Inclusive Gluon Production in Pion-Proton Collisions

Inclusive production of charged pion pairs in proton-antiproton collisions

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