Title: Poincaré-covariant analysis of heavy-quark baryons

Abstract

We use a symmetry-preserving truncation of meson and baryon bound-state equations in quantum field theory in order to develop a unified description of systems constituted from light and heavy quarks. In particular, we compute the spectrum and leptonic decay constants of ground-state pseudoscalar and vector mesons: q'(q) over bar, Q'(Q) over bar, with q', q = u, d, s and Q', Q = c, b, and the masses of J^P = 3/2 ⁺ baryons and their first positive-parity excitations, including those containing one or more heavy quarks. This Poincare covariant analysis predicts that such baryons have a complicated angular momentum structure. For instance, the ground states are all primarily S wave in character, but each possesses P-, D- and F-wave components, with the P-wave fraction being large in the qqq states, and the first positive-parity excitation in each channel having a large D-wave component, which grows with increasing current-quark mass, but also exhibits features consistent with a radial excitation. In conclusion, the configuration space extent of all such baryons decreases as the mass of the valence-quark constituents increases.

Authors:

Qin, Si -Xue ^[1]; Roberts, Craig D. ^[2]; Schmidt, Sebastian M. ^[3]

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+ Show Author Affiliations

1. Chongqing Univ., Chongqing (People's Republic of China)
2. Argonne National Lab. (ANL), Argonne, IL (United States)
3. Forschungszentrum Julich and JARA, Julich (Germany)

Publication Date:

2018-06-13

Research Org.:

Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Org.:

USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

OSTI Identifier:

1460981

Alternate Identifier(s):

OSTI ID: 1454348

Grant/Contract Number:  

AC02-06CH11357

Resource Type:

Accepted Manuscript

Journal Name:

Physical Review D

Additional Journal Information:

Journal Volume: 97; Journal Issue: 11; Journal ID: ISSN 2470-0010

Publisher:

American Physical Society (APS)

Country of Publication:

United States

Language:

English

Subject:

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS