Study of the semileptonic decay D{sub s}{sup +}{yields}f{sub 0}(980)e{sup +}{nu} and implications for B{sub s}{sup 0}{yields}J/{psi}f{sub 0}

Journal Article · Tue Sep 01 00:00:00 EDT 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.80.052009· OSTI ID:21322558

Ecklund, K M ^[1]; He, Q; Insler, J; Muramatsu, H; Park, C S; Thorndike, E H; Yang, F ^[2]; Artuso, M; Blusk, S; Khalil, S; Mountain, R; Randrianarivony, K; Skwarnicki, T; Stone, S; Wang, J C; Zhang, L M ^[3]; Bonvicini, G; Cinabro, D; Lincoln, A; Smith, M J ^[4]

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1. Rice University, Houston, Texas 77005 (United States)
2. University of Rochester, Rochester, New York 14627 (United States)
3. Syracuse University, Syracuse, New York 13244 (United States)
4. Wayne State University, Detroit, Michigan 48202 (United States)

Using e{sup +}e{sup -}{yields}D{sub s}{sup -}D{sub s}*{sup +} and D{sub s}*{sup -}D{sub s}{sup +} interactions at 4170 MeV collected with the CLEO-c detector, we investigate the semileptonic decays D{sub s}{sup +}{yields}f{sub 0}(980)e{sup +}{nu} and D{sub s}{sup +}{yields}{phi}e{sup +}{nu}. By examining the decay rates as functions of the four-momentum transfer squared q{sup 2}, we measure the ratio [(dB/dq{sup 2})(D{sub s}{sup +}{yields}f{sub 0}(980)e{sup +}{nu})B(f{sub 0}{yields}{pi}{sup +}{pi}{sup -})]/[(dB/dq{sup 2})(D{sub s}{sup +}{yields}{phi}e{sup +}{nu})B({phi}{yields}K{sup +}K{sup -})] at q{sup 2} of zero to be (42{+-}11)%. This ratio has been predicted to equal the rate ratio [B(B{sub s}{yields}J/{psi}f{sub 0})B(f{sub 0}{yields}{pi}{sup +}{pi}{sup -})]/[B(B{sub s}{yields}J/{psi}{phi})B({phi}{yields}K{sup +}K{sup -})], thus indicating that the CP eigenstate J/{psi}f{sub 0} could be useful for measuring CP violation via B{sub s} mixing. Assuming a simple pole model for the form factor |f{sub +}(q{sup 2})| in the f{sub 0}e{sup +}{nu} decay, we find a pole mass of (1.7{sub -0.7}{sup +4.5}{+-}0.2) GeV. We also determine the f{sub 0} mass and width as (977{sub -9}{sup +11}{+-}1) and (91{sub -22}{sup +30}{+-}3) MeV, respectively. In addition, we present updated results for B(D{sub s}{sup +}{yields}f{sub 0}(980)e{sup +}{nu})B(f{sub 0}{yields}{pi}{sup +}{pi}{sup -})=(0.20{+-}0.03{+-}0.01)% and B(D{sub s}{sup +}{yields}{phi}e{sup +}{nu})=(2.36{+-}0.23{+-}0.13)%. Assuming that the f{sub 0} wave function is a combination of strange and nonstrange quark-antiquark components, we use our measurement for B(D{sub s}{sup +}{yields}f{sub 0}(980)e{sup +}{nu}) to extract a value of the mixing angle that we find consistent with |ss> dominance, adding to the mystery as to why the f{sub 0} decays predominantly to two pions rather than two kaons.

• OSTI ID: 21322558
• Journal Information: Physical Review. D, Particles Fields, Vol. 80, Issue 5; Other Information: DOI: 10.1103/PhysRevD.80.052009; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B NEUTRAL MESONS
B S MESONS
CESR STORAGE RING
CP INVARIANCE
D S MESONS
ELECTRON-POSITRON INTERACTIONS
F0-980 MESONS
FORM FACTORS
FOUR MOMENTUM TRANSFER
GEV RANGE 01-10
J PSI-3097 MESONS
KAONS MINUS
KAONS PLUS
MASS
MIXING
MULTIPARTICLE SPECTROMETERS
NEUTRINOS
PARTICLE IDENTIFICATION
PIONS MINUS
PIONS PLUS
QUARK-ANTIQUARK INTERACTIONS
SEMILEPTONIC DECAY
WAVE FUNCTIONS
WEINBERG ANGLE