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Measurement of the Dipion Mass Spectrum in X(3872)->J/ψπ+π Decays

CollaborationWith : Campanelli, Mario / Clark, Allan Geoffrey / D'Onofrio, Monica / Donega, Mauro / Lister, Alison / Liu, Yanwen / Vallecorsa, Sofia / Wu, Xin
Published in Physical Review Letters. 2006, vol. 96, no. 10, p. 102002
Abstract We measure the dipion mass spectrum in X(3872)→J/ψπ+π− decays using 360  pb−1 of pp collisions at s√=1.96  TeV collected with the CDF II detector. The spectrum is fit with predictions for odd C-parity (S13, P11, and DJ3) charmonia decaying to J/ψπ+π−, as well as even C-parity states in which the pions are from ρ0 decay. The latter case also encompasses exotic interpretations, such as a D0D*0 molecule. Only the S13 and J/ψρ hypotheses are compatible with our data. Since S13 is untenable on other grounds, decay via J/ψρ is favored, which implies C=+1 for the X(3872). Models for different J/ψ−ρ angular momenta L are considered. Flexibility in the models, especially the introduction of ρ−ω interference, enables good descriptions of our data for both L=0 and 1.
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CDF COLLABORATION. Measurement of the Dipion Mass Spectrum in X(3872)->J/ψπ+π Decays. In: Physical Review Letters, 2006, vol. 96, n° 10, p. 102002. doi: 10.1103/PhysRevLett.96.102002 https://archive-ouverte.unige.ch/unige:38323

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Deposited on : 2014-06-30

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