X17 boson and the H3(p,e+e–)He4 and He3(n,e+e–)He4 processes: A theoretical analysis

Viviani, M.; Filandri, E.; Girlanda, L.; Gustavino, C.; Kievsky, A.; Marcucci, L. E.; Schiavilla, R.

doi:10.1103/physrevc.105.014001

Title: $X 17$ boson and the ${}_{3}H (p, e^{+} e^{-}) {}_{4}{He}$ and ${}_{3}{He} (n, e^{+} e^{-}) {}_{4}{He}$ processes: A theoretical analysis

Journal Article · 03 January 2022 · Physical Review C

DOI: https://doi.org/10.1103/physrevc.105.014001 · OSTI ID:1839217

^[1];

^[2]; Girlanda, L. ^[3]; Gustavino, C. ^[4];

^[1]; Marcucci, L. E. ^[5];

^[6]

National Inst. of Nuclear Physics (INFN), Pisa (Italy)
Univ. of Trento (Italy); National Inst. of Nuclear Physics (INFN), Povo-Trento (Italy). Trento Institute for Fundamental Physics and Applications (TIFPA)
University of Salento, Lecce (Italy); National Inst. of Nuclear Physics (INFN), Lecce (Italy)
National Inst. of Nuclear Physics (INFN), Rome (Italy)
National Inst. of Nuclear Physics (INFN), Pisa (Italy); Univ. of Pisa (Italy)
Old Dominion Univ., Norfolk, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

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 $(χ EFT)$ . 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 $χ EFT$ (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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Research Organization:: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC05-06OR23177

OSTI ID:: 1839217

Report Number(s):: JLAB-THY--21-3351; DOE/OR/23177-5170; arXiv:2104.07808; DE-AC05-06OR23177

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 1 Vol. 105; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: X 17 boson and the H 3 ( p , e+ e– ) He 4 and He 3 ( n , e+ e– ) He 4 processes: A theoretical analysis

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Title: $X 17$ boson and the ${}_{3}H (p, e^{+} e^{-}) {}_{4}{He}$ and ${}_{3}{He} (n, e^{+} e^{-}) {}_{4}{He}$ processes: A theoretical analysis