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Ab Initio Calculations of Charge Symmetry Breaking in Light Hypernuclei

Not scheduled
15m
2nd Floor

2nd Floor

Renaissance Portsmouth-Norfolk Waterfront Hotel 425 Water Street Portsmouth, VA 23704
Abstract Submission

Speaker

Daniel Gazda (Nuclear Physics Institute, Czech Academy of Sciences)

Description

Charge symmetry in hadron physics is broken in QCD by the up-down quark mass difference and electromagnetic interactions. In $\Lambda$ hypernuclei, charge symmetry breaking (CSB) manifests itself in a sizable charge dependence of $\Lambda$ separation energies of light mirror hypernuclei. The large value of CSB was recently reaffirmed by precision measurements of A = 4 hypernuclei [1, 2] and until recently it could not be reproduced in any *ab initio* 4-body calculation. In this contribution, I will report on our *ab initio* no-core shell model calculations of ${}\_\Lambda^4$He and ${}\_\Lambda^4$H using realistic nucleon-nucleon, three-nucleon and hyperon-nucleon interactions derived from chiral effective field theory plus a CSB $\Lambda-\Sigma^0$ mixing vertex [3, 4]. Our calculations provide, for the first time, microscopic understanding of the sizable CSB in $A = 4$ hypernuclei. [1] T.O. Yamamoto *et al.* (J-PARC E13 Collaboration), Phys. Rev. Lett. 115, 222501 (2015). [2] A. Esser *et al.* (A1 Collaboration), Phys. Rev. Lett. 114, 232501 (2015). [3] D. Gazda, A. Gal, Phys. Rev. Lett. 116, 122501 (2016). [4] D. Gazda, A. Gal, Nucl. Phys. A 954, 161 (2016).

Primary author

Daniel Gazda (Nuclear Physics Institute, Czech Academy of Sciences)

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