Measurement of the Dipion Mass Spectrum in X(3872){yields}J/{psi}{pi}{sup +}{pi}{sup -} Decays

Journal Article · Fri Mar 17 04:00:00 EST 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.96.102002· OSTI ID:20777085

Abulencia, A; Budd, S; Chu, P H; Ciobanu, C I; Errede, D; Errede, S; Gerberich, H; Grundler, U; Junk, T R; Kraus, J; Liss, T M; Marino, C; Pitts, K; Rogers, E; Taffard, A; Veramendi, G; Vickey, T; Zhang, X ^[1]; Acosta, D; Cruz, A ^[2]

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1. University of Illinois, Urbana, Illinois 61801 (United States)
2. University of Florida, Gainesville, Florida 32611 (United States)

We measure the dipion mass spectrum in X(3872){yields}J/{psi}{pi}{sup +}{pi}{sup -} decays using 360 pb{sup -1} of pp collisions at {radical}(s)=1.96 TeV collected with the CDF II detector. The spectrum is fit with predictions for odd C-parity ({sup 3}S{sub 1}, {sup 1}P{sub 1}, and {sup 3}D{sub J}) charmonia decaying to J/{psi}{pi}{sup +}{pi}{sup -}, as well as even C-parity states in which the pions are from {rho}{sup 0} decay. The latter case also encompasses exotic interpretations, such as a D{sup 0}D*{sup 0} molecule. Only the {sup 3}S{sub 1} and J/{psi}{rho} hypotheses are compatible with our data. Since {sup 3}S{sub 1} is untenable on other grounds, decay via J/{psi}{rho} is favored, which implies C=+1 for the X(3872). Models for different J/{psi}-{rho} angular momenta L are considered. Flexibility in the models, especially the introduction of {rho}-{omega} interference, enables good descriptions of our data for both L=0 and 1.

• OSTI ID: 20777085
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 10 Vol. 96; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

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