Spectroscopy of doubly charmed baryons from lattice QCD

Padmanath, M.; Edwards, Robert G.; Mathur, Nilmani; Peardon, Michael

doi:10.1103/PhysRevD.91.094502

Title: Spectroscopy of doubly charmed baryons from lattice QCD

Journal Article · Wed May 06 00:00:00 EDT 2015 · Physical Review. D, Particles, Fields, Gravitation and Cosmology

DOI:https://doi.org/10.1103/PhysRevD.91.094502· OSTI ID:1183737

Padmanath, M. ^[1]; Edwards, Robert G. ^[2]; Mathur, Nilmani ^[3]; Peardon, Michael ^[4]

Univ. of Graz, Graz (Austria)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Tata Inst. of Fundamental Research, Mumbai (India)
Trinity College, Dublin (Ireland)

This study presents the ground and excited state spectra of doubly charmed baryons from lattice QCD with dynamical quark fields. Calculations are performed on anisotropic lattices of size 16³ × 128, with inverse spacing in temporal direction a_t⁻¹=5.67(4) GeV and with a pion mass of about 390 MeV. A large set of baryonic operators that respect the symmetries of the lattice yet which retain a memory of their continuum analogues are used. These operators transform as irreducible representations of SU(3)_F symmetry for flavor, SU(4) symmetry for Dirac spins of quarks and O(3) for spatial symmetry. The distillation method is utilized to generate baryon correlation functions which are analyzed using the variational fitting method to extract excited states. The lattice spectra obtained have baryonic states with well-defined total spins up to 7/2 and the pattern of low-lying states does not support the diquark picture for doubly charmed baryons. On the contrary the calculated spectra are remarkably similar to the expectations from models with an SU(6)×O(3) symmetry. Various spin-dependent energy splittings between the extracted states are also evaluated.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

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

Contributing Organization:: Hadron Spectrum Collaboration

DOE Contract Number:: AC05-06OR23177; I1313-N27

OSTI ID:: 1183737

Report Number(s):: JLAB-THY-15-2028; DOE/OR/23177-3332; arXiv:1502.01845; TIFR-TH-15-06; PRVDAQ

Journal Information:: Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 91, Issue 9; ISSN 1550-7998

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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