{"paper":{"title":"The X17 boson and the $^3$H$(p,e^+ e^-)^4$He and $^3$He$(n,e^+ e^-)^4$He processes: a theoretical analysis","arxiv_id":"2104.07808","primary_cat":"nucl-th","submitted_at":"2021-04-15T22:33:43+00:00","version_compiled":"v2"},"notice":"Every quoted sentence is the authors' text from the arXiv listing abstract. Labels and probabilities are the outputs of classifier-1.13.0 on the question bank abstract-p1-20260923, exactly as returned. No sentence in this record was written by a language model.","schema":"pith.compiled-record/v0","status":"compiled","abstract":{"source":"arXiv listing abstract v2","sentences":[{"i":0,"p":0.79,"id":"s0","own":false,"role":"contribution","text":"The present work deals with $e^+$-$e^-$ pair production in the four-nucleon system.","hedge":{"p":0.78,"label":"asserted"},"own_p":0.41,"main_claim_p":0.03,"quantitative":false,"quantitative_p":0.03,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.0,"background":0.21,"limitation":0.0,"future_work":0.0,"contribution":0.79,"interpretation":0.0}},{"i":1,"p":0.61,"id":"s1","own":true,"role":"contribution","text":"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).","hedge":{"p":0.92,"label":"asserted"},"own_p":0.79,"main_claim_p":0.03,"quantitative":false,"quantitative_p":0.05,"role_probabilities":{"gap":0.0,"method":0.39,"result":0.0,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.61,"interpretation":0.0}},{"i":2,"p":0.98,"id":"s2","own":true,"role":"contribution","text":"Next, we examine how the exchange of a hypothetical low-mass boson would impact the cross section for such a process.","hedge":{"p":0.31,"label":"unclear"},"own_p":0.72,"main_claim_p":0.04,"quantitative":false,"quantitative_p":0.04,"role_probabilities":{"gap":0.0,"method":0.02,"result":0.0,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.98,"interpretation":0.0}},{"i":3,"p":0.77,"id":"s3","own":true,"role":"contribution","text":"We consider several possibilities, that this boson is either a scalar, pseudoscalar, vector, or axial particle.","hedge":{"p":0.74,"label":"hedged_possibility"},"own_p":0.56,"main_claim_p":0.03,"quantitative":false,"quantitative_p":0.15,"role_probabilities":{"gap":0.0,"method":0.23,"result":0.0,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.77,"interpretation":0.0}},{"i":4,"p":1.0,"id":"s4","own":true,"role":"method","text":"The ab initio calculations use exact hyperspherical-harmonics methods to describe the bound state and low-energy spectrum of the $A\\,$=$\\,4$ continuum, and fully account for initial state interaction effects in the $3+1$ clusters.","hedge":{"p":1.0,"label":"asserted"},"own_p":0.86,"main_claim_p":0.03,"quantitative":false,"quantitative_p":0.3,"role_probabilities":{"gap":0.0,"method":1.0,"result":0.0,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.0,"interpretation":0.0}},{"i":5,"p":0.8,"id":"s5","own":true,"role":"method","text":"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).","hedge":{"p":0.99,"label":"asserted"},"own_p":0.8,"main_claim_p":0.04,"quantitative":true,"quantitative_p":0.72,"role_probabilities":{"gap":0.0,"method":0.8,"result":0.0,"background":0.0,"limitation":0.2,"future_work":0.0,"contribution":0.0,"interpretation":0.0}},{"i":6,"p":0.95,"id":"s6","own":true,"role":"future_work","text":"We also provide an overview of possible future experiments probing pair production in the $A\\,$=$\\,4$ system at a number of candidate facilities.facilities.","hedge":{"p":0.61,"label":"asserted"},"own_p":0.61,"main_claim_p":0.03,"quantitative":false,"quantitative_p":0.08,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.0,"background":0.0,"limitation":0.0,"future_work":0.95,"contribution":0.05,"interpretation":0.0}}]},"compiled":{"main_claim":{"p":0.65,"text":"Next, we examine 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