The electromagnetic Sigma-to-Lambda hyperon transition form factors at low energies

Granados, Carlos; Leupold, Stefan; Perotti, Elisabetta

doi:10.1140/epja/i2017-12324-4

Title: The electromagnetic Sigma-to-Lambda hyperon transition form factors at low energies

Journal Article · Fri Jun 09 00:00:00 EDT 2017 · European Physical Journal. A

DOI:https://doi.org/10.1140/epja/i2017-12324-4· OSTI ID:1369457

Granados, Carlos ^[1]; Leupold, Stefan ^[2]; Perotti, Elisabetta ^[2]

Uppsala Univ., Uppsala (Sweden); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Uppsala Univ., Uppsala (Sweden)

Using dispersion theory the low-energy electromagnetic form factors for the transition of a Sigma to a Lambda hyperon are related to the pion vector form factor. The additionally required input, i.e. the two-pion-Sigma-Lambda amplitudes are determined from relativistic next-to-leading-order (NLO) baryon chiral perturbation theory including the baryons from the octet and optionally from the decuplet. Pion rescattering is again taken into account by dispersion theory. It turns out that the inclusion of decuplet baryons is not an option but a necessity to obtain reasonable results. The electric transition form factor remains very small in the whole low-energy region. The magnetic transition form factor depends strongly on one not very well determined low-energy constant of the NLO Lagrangian. Furthermore, one obtains reasonable predictive power if this low-energy constant is determined from a measurement of the magnetic transition radius. Such a measurement can be performed at the future Facility for Antiproton and Ion Research (FAIR).

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Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-06OR23177

OSTI ID:: 1369457

Report Number(s):: JLAB-THY-17-2510; DOE/OR/23177-4186; arXiv:1701.09130; PII: 860

Journal Information:: European Physical Journal. A, Vol. 53, Issue 6; ISSN 1434-6001

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 32 works

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