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10 pages, 456 KiB

Open AccessCommunication

The Radiative Δ(1600) → γN Decay in the Light-Cone QCD Sum Rules

by Haifa I. Alrebdi and Thabit Barakat

Universe 2021, 7(8), 255; https://doi.org/10.3390/universe7080255 - 21 Jul 2021

Cited by 1 | Viewed by 1658

Within the framework of the light-cone QCD sum rules method (LCSR’s), the radiative

Δ (1600) \to γ N

decay is studied. In particular, the magnetic dipole moment

G_{M}^{1} (0)

and the electric quadrupole moment [...] Read more.

Within the framework of the light-cone QCD sum rules method (LCSR’s), the radiative

Δ (1600) \to γ N

decay is studied. In particular, the magnetic dipole moment

G_{M}^{1} (0)

and the electric quadrupole moment

G_{E}^{1} (0)

are estimated. We also calculate the ratio

R_{E M} = - \frac{G_{E}^{1} (0)}{G_{M}^{1} (0)}

and the decay rate. The predicted multipole moments and the decay rate strongly agree with the existing experimental results as well as with the other available phenomenological approaches. Full article

(This article belongs to the Section High Energy Nuclear and Particle Physics)

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19 pages, 783 KiB

Open AccessArticle

Identifying the Λ_b(6146)⁰ and Λ_b(6152)⁰ as D-Wave Bottom Baryons

by Qiang Mao, Hua-Xing Chen and Hui-Min Yang

Universe 2020, 6(6), 86; https://doi.org/10.3390/universe6060086 - 23 Jun 2020

Cited by 8 | Viewed by 2743

Abstract

We study the

Λ_{b} {(6146)}^{0}

and

Λ_{b} {(6152)}^{0}

recently observed by LHCb using the method of Quantum Chromodynamics (QCD) sum rules within the framework of heavy quark effective theory. Our results suggest that they can [...] Read more.

We study the

Λ_{b} {(6146)}^{0}

and

Λ_{b} {(6152)}^{0}

recently observed by LHCb using the method of Quantum Chromodynamics (QCD) sum rules within the framework of heavy quark effective theory. Our results suggest that they can be interpreted as D-wave bottom baryons of

J^{P} = 3 / 2^{+}

and

5 / 2^{+}

respectively, both of which contain two

λ

-mode excitations. We also investigate other possible assignments containing

ρ

-mode excitations. We extract all the parameters that are necessary to study their decay properties when using the method of light-cone sum rules. We predict masses of their strangeness partners to be

m_{Ξ_{b} (3 / 2^{+})} = {6.26}_{- 0.14}^{+ 0.11}

GeV and

m_{Ξ_{b} (5 / 2^{+})} = {6.26}_{- 0.14}^{+ 0.11}

GeV with the mass splitting

Δ M = m_{Ξ_{b} (5 / 2^{+})} - m_{Ξ_{b} (3 / 2^{+})} = {4.5}_{- 1.5}^{+ 1.9}

MeV, and propose to search for them in future CMS, EIC, and LHCb experiments. Full article

(This article belongs to the Section High Energy Nuclear and Particle Physics)

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8 pages, 367 KiB

Open AccessArticle

Estimation of Nucleon D-Term in QCD

by Igor V. Anikin

Particles 2019, 2(3), 357-364; https://doi.org/10.3390/particles2030022 - 28 Jun 2019

Cited by 5 | Viewed by 2791

Abstract

Using the light-cone sum rules at leading order, we present an approach to perform the preliminary upper estimation for the nucleon gravitational form factor

D (t)

(D-term contribution). Comparison with the experimental data and with the results of different [...] Read more.

Using the light-cone sum rules at leading order, we present an approach to perform the preliminary upper estimation for the nucleon gravitational form factor

D (t)

(D-term contribution). Comparison with the experimental data and with the results of different models is discussed. Full article

(This article belongs to the Special Issue QCD and Hadron Structure)

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