Measurement of the dipion mass spectrum in $X(3872) \to J/\psi \pi^+ \pi^-$ decays. - INSPIRE

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Measurement of the dipion mass spectrum in $X(3872) \to J/\psi \pi^+ \pi^-$ decays.

CDF

Collaboration

Dec, 2005

7 pages

Published in:

Phys.Rev.Lett. 96 (2006) 102002

e-Print:

hep-ex/0512074 [hep-ex]

DOI:

10.1103/PhysRevLett.96.102002

Report number:

FERMILAB-PUB-05-535-E

Experiments:

FNAL-E-0830

View in:

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Abstract:

We measure the dipion mass spectrum in X(3872)--> J/Psi Pi+ Pi- decays using 360 pb-1 of pbar-p collisions at 1.96 TeV collected with the CDF II detector. The spectrum is fit with predictions for odd C-parity (3S1, 1P1, and 3DJ) charmonia decaying to J/Psi Pi+ Pi-, as well as even C-parity states in which the pions are from Rho0 decay. The latter case also encompasses exotic interpretations, such as a D0-D*0Bar molecule. Only the 3S1 and J/Psi Rho hypotheses are compatible with our data. Since 3S1 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, enable good descriptions of our data for both L=0 and 1.

Note:

7 pages, 4 figures -- Submitted to Phys. Rev. Lett Report-no: FERMILAB-PUB-05/535-E

14.40.Gx
13.25.Gv
12.39.Mk
X mesons
meson hadronic decay
proton-proton inclusive interactions
high-energy elementary particle interactions
anti-p p: colliding beams
anti-p p: inclusive reaction
X(3872): hadroproduction

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