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Title: Consistency checks for two-body finite-volume matrix elements. II. Perturbative systems

Journal Article · · Physical Review. D.

There is a broad need to study form-factor of multihadron states, from understanding the na- ture of hadronic resonances and bound-states in terms of their constituent quarks and gluons to the manifestation of beyond the Standard Model physics at low energies. With this goal in mind, a framework was developed to determine two-hadron form-factors by relating finite-volume matrix ele- ments, computed from lattice QCD, to infinite-volume $$\mathbf{2}+\mathcal{J} \to \mathbf{2}$$ electroweak transition amplitudes. Following earlier studies of the formalism, we continue to provide non-trivial consistency checks in order to gain confidence in the framework. We explore the non-relativistic limit of a two-hadron system probed by a scalar current, showing that near threshold the finite-volume matrix element can be expressed as a series in the inverse volume of the box. We provide two confirmations of the analytic expansion. First, we evaluate the exact result numerically and explore the asymptotically large-volume limit. Second, we perform an independent analytical determination of the matrix ele- ment using time-ordered perturbation theory. This is similar in spirit to existing calculations in the literature, but unlikely previous result we include all diagrams appearing at the desired order.

Research Organization:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC05-06OR23177; de-sc0019229; sc0019229
OSTI ID:
1630374
Alternate ID(s):
OSTI ID: 1630698
Report Number(s):
JLAB-THY-19-3113; DOE-OR-23177-4865; PRVDAQ; 094508
Journal Information:
Physical Review. D., Journal Name: Physical Review. D. Vol. 101 Journal Issue: 9; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 10 works
Citation information provided by
Web of Science

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