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Title: Analysis of the Quantum Numbers J{sup PC} of the X(3872) Particle

Abstract

We present an analysis of angular distributions and correlations of the X(3872) particle in the exclusive decay mode X(3872){yields}J/{psi}{pi}{sup +}{pi}{sup -} with J/{psi}{yields}{mu}{sup +}{mu}{sup -}. We use 780 pb{sup -1} of data from pp collisions at {radical}(s)=1.96 TeV collected with the CDF II detector at the Fermilab Tevatron. We derive constraints on spin, parity, and charge conjugation parity of the X(3872) particle by comparing measured angular distributions of the decay products with predictions for different J{sup PC} hypotheses. The assignments J{sup PC}=1{sup ++} and 2{sup -+} are the only ones consistent with the data.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1]; ; ; ; ;  [2]
  1. University of Illinois, Urbana, Illinois 61801 (United States)
  2. Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637 (United States) (and others)
Publication Date:
OSTI Identifier:
20951183
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 13; Other Information: DOI: 10.1103/PhysRevLett.98.132002; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ANGULAR DISTRIBUTION; FERMILAB COLLIDER DETECTOR; J PSI-3097 MESONS; MUONS MINUS; MUONS PLUS; PAIR PRODUCTION; PARITY; PARTICLE DECAY; PIONS MINUS; PIONS PLUS; PROTON-PROTON INTERACTIONS; QUANTUM NUMBERS; SPIN; TEV RANGE 01-10

Citation Formats

Abulencia, A., Budd, S., Ciobanu, C. I., Errede, D., Errede, S., Gerberich, H., Grundler, U., Junk, T. R., Kraus, J., Marino, C. P., Pitts, K., Rogers, E., Taffard, A., Veramendi, G., Zhang, X., Adelman, J., Brubaker, E., Fedorko, W. T., Furic, I., and Grosso-Pilcher, C.. Analysis of the Quantum Numbers J{sup PC} of the X(3872) Particle. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.132002.
Abulencia, A., Budd, S., Ciobanu, C. I., Errede, D., Errede, S., Gerberich, H., Grundler, U., Junk, T. R., Kraus, J., Marino, C. P., Pitts, K., Rogers, E., Taffard, A., Veramendi, G., Zhang, X., Adelman, J., Brubaker, E., Fedorko, W. T., Furic, I., & Grosso-Pilcher, C.. Analysis of the Quantum Numbers J{sup PC} of the X(3872) Particle. United States. doi:10.1103/PHYSREVLETT.98.132002.
Abulencia, A., Budd, S., Ciobanu, C. I., Errede, D., Errede, S., Gerberich, H., Grundler, U., Junk, T. R., Kraus, J., Marino, C. P., Pitts, K., Rogers, E., Taffard, A., Veramendi, G., Zhang, X., Adelman, J., Brubaker, E., Fedorko, W. T., Furic, I., and Grosso-Pilcher, C.. Fri . "Analysis of the Quantum Numbers J{sup PC} of the X(3872) Particle". United States. doi:10.1103/PHYSREVLETT.98.132002.
@article{osti_20951183,
title = {Analysis of the Quantum Numbers J{sup PC} of the X(3872) Particle},
author = {Abulencia, A. and Budd, S. and Ciobanu, C. I. and Errede, D. and Errede, S. and Gerberich, H. and Grundler, U. and Junk, T. R. and Kraus, J. and Marino, C. P. and Pitts, K. and Rogers, E. and Taffard, A. and Veramendi, G. and Zhang, X. and Adelman, J. and Brubaker, E. and Fedorko, W. T. and Furic, I. and Grosso-Pilcher, C.},
abstractNote = {We present an analysis of angular distributions and correlations of the X(3872) particle in the exclusive decay mode X(3872){yields}J/{psi}{pi}{sup +}{pi}{sup -} with J/{psi}{yields}{mu}{sup +}{mu}{sup -}. We use 780 pb{sup -1} of data from pp collisions at {radical}(s)=1.96 TeV collected with the CDF II detector at the Fermilab Tevatron. We derive constraints on spin, parity, and charge conjugation parity of the X(3872) particle by comparing measured angular distributions of the decay products with predictions for different J{sup PC} hypotheses. The assignments J{sup PC}=1{sup ++} and 2{sup -+} are the only ones consistent with the data.},
doi = {10.1103/PHYSREVLETT.98.132002},
journal = {Physical Review Letters},
number = 13,
volume = 98,
place = {United States},
year = {Fri Mar 30 00:00:00 EDT 2007},
month = {Fri Mar 30 00:00:00 EDT 2007}
}
  • The authors present an analysis of angular distributions and correlations of the X(3872) in the exclusive decay mode X(3872) {yields} J/{psi}{pi}{sup +}{pi}{sup -} with J/{psi} {yields} {mu}{sup +}{mu}{sup -}. They use 780 pb{sup -1} of data from p{bar p} collisions at {radical}s = 1.96 TeV collected with the CDF II detector at the Fermilab Tevatron. They derive constraints on spin, parity, and charge conjugation parity of the X(3872) by comparing measured angular distributions of the decay products with predictions for different J{sup PC} hypotheses. The assignments J{sup PC} = 1{sup ++} and 2{sup -+} are the only ones consistent withmore » the data.« less
  • This thesis studied properties of the charmonium-like X(3872) state, which is an exotic matter candidate. The measurements are performed using a data sample collected with the CDF experiment.
  • We analyze recent data from the BABAR and Belle Collaborations on the X(3872) resonance in the J/{psi}{pi}{sup +{pi}-} and D{sup 0}D{sup 0{pi}0} decay channels, taking careful account of the universal features of an S-wave threshold resonance. Because the line shapes for such a resonance are not integrable functions of the energy, the resonance parameters depend on the prescriptions used to define them. In recent experimental analyses of the D{sup 0}D{sup 0{pi}0} channel, an event near the D*{sup 0}D{sup 0} threshold was assumed to come from D*{sup 0}D{sup 0} or D{sup 0}D*{sup 0} and was therefore assigned an energy above themore » threshold. Taking this effect into account, our analysis of the D{sup 0}D{sup 0{pi}0} data gives a mass for the X(3872) that is below the D*{sup 0}D{sup 0} threshold. Our analyses in both the J/{psi}{pi}{sup +{pi}-} and D{sup 0}D{sup 0{pi}0} channels are consistent with the identification of the X(3872) as an extremely weakly bound charm meson molecule.« less
  • In a study of B{sup +}{yields}J/{psi}{gamma}K{sup +} decays, we find evidence for the radiative decay X(3872){yields}J/{psi}{gamma} with a statistical significance of 3.4{sigma}. We measure the product of branching fractions B(B{sup +}{yields}X(3872)K{sup +}){center_dot}B(X(3872){yields}J/{psi}{gamma})=(3.3{+-}1.0{+-}0.3)x10{sup -6}, where the uncertainties are statistical and systematic, respectively. We also measure the branching fraction B(B{sup +}{yields}{chi}{sub c1}K{sup +})=(4.9{+-}0.2{+-}0.4)x10{sup -4}. These results are obtained from (287{+-}3) million BB decays collected at the {upsilon}(4S) resonance with the BABAR detector at the PEP-II B Factory at SLAC.
  • We present measurements of the decays B{sup +}{yields}X(3872)K{sup +} and B{sup 0}{yields}X(3872)K{sup 0} with X(3872){yields}J/{psi}{pi}{sup +}{pi}{sup -}. The data sample used, collected with the BABAR detector at the PEP-II e{sup +}e{sup -} asymmetric-energy storage ring, corresponds to 455x10{sup 6}BB pairs. Branching fraction measurements of B(B{sup +}{yields}X(3872)K{sup +})xB(X(3872){yields}J/{psi}{pi}{sup +}{pi}{sup -})=(8.4{+-}1.5{+-}0.7)x10{sup -6} and B(B{sup 0}{yields}X(3872)K{sup 0})xB(X(3872){yields}J/{psi}{pi}{sup +}{pi}{sup -})=(3.5{+-}1.9{+-}0.4)x10{sup -6} are obtained. We set an upper limit on the natural width of the X(3872) of {gamma}<3.3 MeV/c{sup 2} at the 90% confidence level.