Isovector axial vector form factors of octet–decuplet hyperon transition in QCD

We use the energy-momentum tensor (EMT) current to compute the EMT form factors of the nucleon in the framework of the light cone QCD sum rule formalism. In the calculations, we employ the most general form of the nucleon's interpolating field and use the distribution amplitudes (DAs) of the nucleon with two sets of the numerical values of the main input parameters entering the expressions of the DAs. The directly obtained results from the sum rules for the form factors are reliable at Q 2 ≥ 1 GeV 2 : To extrapolate the results to include the zero momentum transfer squared with the aim of estimation of the related static physical quantities, we use some fit functions for the form factors. The numerical computations show that the energy-momentum tensor form factors of the nucleon can be well fitted to the multipole fit form. We compare the results obtained for the form factors at Q 2 = 0 with the existing theoretical predictions as well as experimental data on the gravitational form factor d q 1 (0). For the form factors M q 2 (0) and J q (0) a consistency among the theoretical predictions is seen within the errors: Our results are nicely consistent with the Lattice QCD and chiral perturbation theory predictions. However, there are large discrepancies among the theoretical predictions on d q 1 (0). Nevertheless, our prediction is in accord with the JLab data as well as with the results of the Lattice QCD, chiral perturbation theory and KM15-fit. Our fit functions well define most of the JLab data in the interval Q 2 ∈ [0, 0.4] GeV 2 , while the Lattice results suffer from large uncertainties in this region. As a by-product, some mechanical properties of the nucleon like the pressure and energy density at the center of nucleon as well as its mechanical radius are also calculated and their results are compared with other existing theoretical predictions.

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“…This method is quite accomplished in determining the baryonic form factors at high Q 2 (see e.g. [44][45][46][47][48][49][50][51][52][53][54]).…”

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confidence: 99%

Nucleon’s energy–momentum tensor form factors in light-cone QCD

Azizi

Özdem

2020

Eur. Phys. J. C

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“…The light cone QCD sum rule approach has been suscesfully applied to calculate different form factors of hadrons as well as the transition form factors among baryons due to the electromagnetic, axial and tensor currents at high Q 2 (see e.g. [36][37][38][39][40][41][42][43][44][45][46][47][48]).…”

Section: Introductionmentioning

confidence: 99%

Gravitational transition form factors of N(1535)→N

Özdem

Azizi

2020

Phys. Rev. D

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We employ the quark part of the symmetric energy-momentum tensor current to calculate the transition gravitational form factors of the N (1535) → N by means of the light cone QCD sum rule formalism. In numerical analysis, we use two different sets of the shape parameters in the distribution amplitudes of the N (1535) baryon and the general form of the nucleon's interpolating current. It is seen that the momentum squared dependence of the gravitational form factors can be well described by the p-pole fit function. The results obtained by using two sets of parameters are found to be quite different from each other and the N (1535) → N transition gravitational form factors depend highly on the shape parameters of the distribution amplitudes of the N (1535) state that parameterize relative orbital angular momentum of the constituent quarks.

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“…This method has been rather successful in determining hadron form factors at high Q 2 . Using the LCSR, the isovector axial vector form factors of baryons have been calculated [5][6][7]. For ∆ baryon isovector axial vector form factors have been studied using lattice QCD [8], chiral perturbation theory [9] and quark models [1,[10][11][12].…”

Section: Introductionmentioning

confidence: 99%

The axial charge of Δbaryon in QCD

Ozdem,

Kucukarslan,

Ozpineci

2015

Preprint

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Isovector axial vector form factors of octet–decuplet hyperon transition in QCD

Cited by 5 publications

References 54 publications

Nucleon’s energy–momentum tensor form factors in light-cone QCD

Nucleon’s energy–momentum tensor form factors in light-cone QCD

Gravitational transition form factors of N(1535)→N

The axial charge of Δbaryon in QCD

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