Meson production in J/ψ decays and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.svg"><mml:mi>J</mml:mi><mml:mo stretchy="false">/</mml:mo><mml:mi>ψ</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:mi>N</mml:mi><mml:mover accent="true"><mml:mrow><mml:mi>N</mml:mi></mml:mrow><mml:mrow><mml:mo stretchy="false">¯</mml:mo></mml:mrow></mml:mover><mml:mi>γ</mml:mi></mml:math> process

Salnikov, S.G.; Milstein, A.I.

doi:10.1016/j.nuclphysb.2024.116539

Nuclear Physics B

2024

DOI: 10.1016/j.nuclphysb.2024.116539

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Meson production in J/ψ decays and J/ψ→NN¯γ process

S.G. Salnikov,

A.I. Milstein

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2024

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Cited by 2 publications

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Study of the timelike electromagnetic form factors of the Λc

Guo,

Yang,

Dai

2024

Phys. Rev. D

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In this paper, the reaction of electron-positron annihilation into Λc+Λ¯c− is investigated. The Λc+Λ¯c− scattering amplitudes are obtained by solving the Lippmann-Schwinger equation. The contact, annihilation, and two pseudoscalar-exchange potentials are taken into account in the spirit of the chiral effective field theory. The amplitudes of e+e−→Λc+Λ¯c− are constructed by the distorted wave Born approximation method, with the final state interactions of the Λc+Λ¯c− rescattering implemented. By fitting to the experimental data, the unknown couplings are fixed, and high-quality solutions are obtained. With these amplitudes, the individual electromagnetic form factors in the timelike region, GEΛc, GMΛc, and their ratio, GEΛc/GMΛc, are extracted. Both modulus and phases are predicted. These individual electromagnetic form factors reveal new insights into the properties of the Λc. The separated contributions of the Born term, contact, annihilation, as well as the two pseudoscalar-exchange potentials to the electromagnetic form factors are isolated. It is found that the Born term dominates the whole energy region. The contact term plays a crucial role in the enhancement near the threshold, and the annihilation term is essential in generating the fluctuation of the electromagnetic form factors. Published by the American Physical Society 2024

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Study of the timelike electromagnetic form factors of the Λc

Guo,

Yang,

Dai

2024

Phys. Rev. D

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Pole structures of the X(1840) or X(1835) and the

Niu,

Zhang,

et al. 2024

Phys. Rev. D

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Whether the NN¯ interaction could form a state or not is a long standing question, even before the observation of the pp¯ threshold enhancement in 2003. The recent high statistic measurement in the J/ψ→γ3(π+π−) channel would provide a good opportunity to probe the nature of the peak structures around the pp¯ threshold in various processes. By constructing the NN¯ interaction respecting chiral symmetry, we extract the pole positions by fitting the pp¯ and 3(π+π−) invariant mass distributions of the J/ψ→γpp¯ and J/ψ→γ3(π+π−) processes. The threshold enhancement in the pp¯ invariant mass distribution is from the pole on the third Riemann sheet, which more couples to the isospin triplet channel. The broader structure in the 3(π+π−) invariant mass comes from the pole on the physical Riemann sheet, which more couples to the isospin singlet channel. Furthermore, the large compositeness indicates that there should exist pp¯ resonance based on the current experimental data. In addition, we also see a clear threshold enhancement in the nn¯ channel, but not as significant as that in pp¯ channel, which is useful and compared with further experimental measurement. Published by the American Physical Society 2024

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Meson production in J/ψ decays and J/ψ→NN¯γ process

Cited by 2 publications

References 20 publications

Study of the timelike electromagnetic form factors of the Λc

Study of the timelike electromagnetic form factors of the Λc

Pole structures of the X(1840) or X(1835) and the

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