期刊
PHYSICAL REVIEW C
卷 105, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.105.014001
关键词
-
资金
- U.S. Department of Energy, Office of Nuclear Science [DE-AC05-06OR23177]
- INFN-Pisa computing center
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据