Heavy-quark symmetry and the electromagnetic decays of excited charmed strange mesons

Journal Article · Fri Oct 01 04:00:00 EDT 2004 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.70.074014· OSTI ID:20705338

Mehen, Thomas ^[1]; Springer, Roxanne P ^[1]

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1. Department of Physics, Duke University, Durham, North Carolina 27708 (United States)

Heavy-hadron chiral perturbation theory (HH{chi}PT) is applied to the decays of the even-parity charmed strange mesons, D{sub s0}(2317) and D{sub s1}(2460). Heavy-quark spin-symmetry predicts the branching fractions for the three electromagnetic decays of these states to the ground states D{sub s} and D{sub s}* in terms of a single parameter. The resulting predictions for two of the branching fractions are significantly higher than current upper limits from the CLEO experiment. Leading corrections to the branching ratios from chiral loop diagrams and spin-symmetry violating operators in the HH{chi}PT Lagrangian can naturally account for this discrepancy. Finally the proposal that the D{sub s0}(2317) (D{sub s1}(2460)) is a hadronic bound state of a D(D*) meson and a kaon is considered. Leading order predictions for electromagnetic branching ratios in this molecular scenario are in very poor agreement with existing data.

• OSTI ID: 20705338
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 70; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B QUARKS
BOUND STATE
BRANCHING RATIO
C QUARKS
CESR STORAGE RING
CHIRAL SYMMETRY
CHIRALITY
CORRECTIONS
D MESONS
D S MESONS
GROUND STATES
HADRONIC PARTICLE DECAY
KAONS
LAGRANGIAN FIELD THEORY
LAGRANGIAN FUNCTION
MULTIPARTICLE SPECTROMETERS
PARITY
PARTICLE IDENTIFICATION
PERTURBATION THEORY
QUARK MODEL
SPIN
T QUARKS