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Title: Measurement of the Dipion Mass Spectrum in X(3872) -->j/psipi+ pi- Decays

Abstract

No abstract prepared.

Authors:
;
Publication Date:
Research Org.:
COLLABORATION - Fermi
OSTI Identifier:
917537
Report Number(s):
LBNL-61632
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US0805060
DOE Contract Number:
DE-AC02-05CH11231
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 96; Related Information: Journal Publication Date: 2006
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; PIONS; DECAY; FERMILAB

Citation Formats

Abulencia, A., and et al. Measurement of the Dipion Mass Spectrum in X(3872) -->j/psipi+ pi- Decays. United States: N. p., 2005. Web.
Abulencia, A., & et al. Measurement of the Dipion Mass Spectrum in X(3872) -->j/psipi+ pi- Decays. United States.
Abulencia, A., and et al. Thu . "Measurement of the Dipion Mass Spectrum in X(3872) -->j/psipi+ pi- Decays". United States. doi:.
@article{osti_917537,
title = {Measurement of the Dipion Mass Spectrum in X(3872) -->j/psipi+ pi- Decays},
author = {Abulencia, A. and et al.},
abstractNote = {No abstract prepared.},
doi = {},
journal = {Physical Review Letters},
number = ,
volume = 96,
place = {United States},
year = {Thu Dec 15 00:00:00 EST 2005},
month = {Thu Dec 15 00:00:00 EST 2005}
}
  • The authors measure the dipion mass spectrum in X(3872) {yields} J/{psi}{pi}{sup +}{pi}{sup -} decays using 360 pb{sup -1} of {bar p}p 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 event 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}{bar D}*{sup 0} molecule. Only the {sup 3}S{sub 1} and J/{psi} {rho} hypotheses are compatible withmore » the 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, enable good descriptions of the data for both L = 0 and 1.« less
  • 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 untenablemore » 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.« less
  • It is pointed out that dipion invariant mass spectrum in X(3872){yields}J/{psi}{pi}{pi} is a useful probe for the J{sup PC} quantum number of the X(3872), complementary to the angular distributions. If X(3872) is a {sup 1}P{sub 1} state, the dipion has a peak at a low m{sub {pi}}{sub {pi}} region, which is not in accordance with the preliminary Belle data. If X(3872) is a {sup 3}D{sub 2} or {sup 3}D{sub 3} state, the dipion spectrum shows a peak at a high m{sub {pi}}{sub {pi}} region, which is broader than the {rho} resonance that might come from the decay of a molecularmore » state: (DD{sup )}(I=1){yields}J/{psi}{rho}{yields}J/{psi}{pi}{sup +}{pi}{sup -}. Better measurement of the m{sub {pi}}{sub {pi}} spectrum will shed light on the nature of X(3872)« less
  • We show the m{sub {pi}}{sub {pi}} spectrum in X(3872){yields}J/{psi}{pi}{pi} can be useful in determination of the J{sup PC} quantum number of X(3872)
  • We present an analysis of the mass of the X(3872) reconstructed via its decay to J/psipi{sup +}pi{sup -} using 2.4 fb{sup -1} of integrated luminosity from pp collisions at sq root(s)=1.96 TeV, collected with the CDF II detector at the Fermilab Tevatron. The possible existence of two nearby mass states is investigated. Within the limits of our experimental resolution the data are consistent with a single state, and having no evidence for two states we set upper limits on the mass difference between two hypothetical states for different assumed ratios of contributions to the observed peak. For equal contributions, themore » 95% confidence level upper limit on the mass difference is 3.6 MeV/c{sup 2}. Under the single-state model the X(3872) mass is measured to be 3871.61+-0.16(stat)+-0.19(syst) MeV/c{sup 2}, which is the most precise determination to date.« less