4.5 Article

X17 boson and the 3H(p, e+e-) 4He and 3He(n, e+e-) 4He processes: A theoretical analysis

期刊

PHYSICAL REVIEW C
卷 105, 期 1, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.105.014001

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资金

  1. U.S. Department of Energy, Office of Nuclear Science [DE-AC05-06OR23177]
  2. INFN-Pisa computing center

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This study investigates e(+)-e(-) pair production in the four-nucleon system using a state-of-the-art approach derived from chiral effective field theory (chi EFT). The impact of exchanging a hypothetical low-mass boson on the cross section is examined, considering various possibilities. The calculations utilize exact hyperspherical-harmonics methods and provide an overview of potential future experiments in this field.
The present work deals with e(+)-e(-) pair production in the four-nucleon system. We first analyze the process as a purely electromagnetic one in the context of a state-of-the-art approach to nuclear strong-interaction dynamics and nuclear electromagnetic currents, derived from chiral effective field theory (chi EFT). Next, we examine how the exchange of a hypothetical low-mass boson would impact the cross section for such a process. We consider several possibilities, that this boson is either a scalar, pseudoscalar, vector, or axial particle. The ab initio calculations use exact hyperspherical-harmonics methods to describe the bound state and low-energy spectrum of the A = 4 continuum, and they fully account for initial state interaction effects in the 3 + 1 clusters. While electromagnetic interactions are treated to high orders in the chiral expansion, the interactions of the hypothetical boson with nucleons are modeled in leading-order chi EFT (albeit, in some instances, selected subleading contributions are also accounted for). We also provide an overview of possible future experiments probing pair production in the A = 4 system at a number of candidate facilities.

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