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Title: The X(3872) at the Tevatron

Abstract

The author reports results on the X(3872) from the Tevatron. Mass and other properties have been studied, with a focus on new results on the dipion mass spectrum in X {yields} J/{psi}{pi}{sup +}{pi}{sup -} decays. Dipions favor interpreting the decay as J/{psi}{rho}, implying even C-parity for the X. Modeling uncertainties do not allow distinguishing between S- and P-wave decays of the J/{psi}-{rho} mode. Effects of {rho}-{omega} interference in X decay are also introduced.

Authors:
;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
878933
Report Number(s):
FERMILAB-CONF-05-488-E
arXiv eprint number hep-ex/0511041; TRN: US0701212
DOE Contract Number:
AC02-76CH03000
Resource Type:
Conference
Resource Relation:
Journal Name: AIP Conf.Proc.842:604-606,2006; Conference: Contributed to Particles and Nuclei International Conference (PANIC 05), Santa Fe, New Mexico, 24-28 Oct 2005
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; DECAY; FERMILAB TEVATRON; NUCLEI; SIMULATION; Experiment-HEP

Citation Formats

Bauer, G., and /MIT, LNS. The X(3872) at the Tevatron. United States: N. p., 2005. Web.
Bauer, G., & /MIT, LNS. The X(3872) at the Tevatron. United States.
Bauer, G., and /MIT, LNS. Tue . "The X(3872) at the Tevatron". United States. doi:. https://www.osti.gov/servlets/purl/878933.
@article{osti_878933,
title = {The X(3872) at the Tevatron},
author = {Bauer, G. and /MIT, LNS},
abstractNote = {The author reports results on the X(3872) from the Tevatron. Mass and other properties have been studied, with a focus on new results on the dipion mass spectrum in X {yields} J/{psi}{pi}{sup +}{pi}{sup -} decays. Dipions favor interpreting the decay as J/{psi}{rho}, implying even C-parity for the X. Modeling uncertainties do not allow distinguishing between S- and P-wave decays of the J/{psi}-{rho} mode. Effects of {rho}-{omega} interference in X decay are also introduced.},
doi = {},
journal = {AIP Conf.Proc.842:604-606,2006},
number = ,
volume = ,
place = {United States},
year = {Tue Nov 01 00:00:00 EST 2005},
month = {Tue Nov 01 00:00:00 EST 2005}
}

Conference:
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  • I report results on the X(3872) from the Tevatron. Mass and other properties have been studied, with a focus on new results on the dipion mass spectrum in X {yields} J/{psi}{pi}+{pi}- decays. Dipions favor interpreting the decay as J/{psi}{rho}, implying even C-parity for the X. Modeling uncertainties do not allow distinguishing between S- and P-wave decays of the J/{psi}-{rho} mode. Effects of {rho}-{omega} interference in X {yields} J/{psi}{pi}+{pi}- decay are also introduced.
  • We predict the differential cross sections for production of the X(3872) at the Tevatron and the Large Hadron Collider from both prompt QCD mechanisms and from decays of b hadrons. The prompt cross section is calculated using the nonrelativistic QCD (NRQCD) factorization formula. Simplifying assumptions are used to reduce the nonperturbative parameters to a single nonrelativistic QCD matrix element that is determined from an estimate of the prompt cross section at the Tevatron. For X(3872) with transverse momenta greater than about 4 GeV, the predicted cross section is insensitive to the simplifying assumptions. We also discuss critically a recent analysismore » that concluded that the prompt production rate at the Tevatron is too large by orders of magnitude for the X(3872) to be a weakly bound charm-meson molecule. We point out that if charm-meson rescattering is properly taken into account, the upper bound is increased by orders of magnitude and is compatible with the observed production rate at the Tevatron.« less
  • In 2003 the X(3872) particle was discovered by the Belle collaboration. Despite results collected since then, the nature of the state still remains unclear. In this contribution we report on new results on properties of the X(3872) state using data collected with CDF II detector at the Fermilab Tevatron. The dipion mass spectrum and angular distributions are used to determine the J{sup PC} quantum numbers of the state.
  • The BABAR Collaboration performed a search for x (2220) production in the initial-state radiation process e{sup +}e{sup -} {yields} {gamma} J/{Psi}, J/{Psi} {yields} {gamma}K{sup +}K{sup -} or J/{Psi} {yields} {gamma}K{sub S}{sup 0}K{sub S}{sup 0}. No evidence for the {xi} (2220) resonance has been found. The 90% confidence level upper limits on the product of branching fractions are sensitive to the spin and helicity hypotheses. These upper limits are of the order 10{sup -5}, below the values reported in previous experiments. Also at BABAR, the decays B {yields} J/{Psi} {pi}{sup +}{pi}{sup -}{pi}{sup 0}K are studied to search for the decay X(3872)more » {yields} J/{Psi}{gamma}. This search yields a four standard deviation evidence for X(3872) {yields} J/{Psi}{omega}, with product branching fractions of {Beta}(B{sup +} {yields} X(3872)K{sup +}) x {Beta}(X(3872) {yields} J/{Psi}{omega}) = [0.6 {+-} 0.2(stat) {+-} 0.1(syst)] x 10{sup -5}, and {Beta}(B{sup 0} {yields} X(3872)K{sup 0}) x {Beta}(X(3872) {yields} J/y{Psi}) = [0.6 {+-} 0.3(stat) {+-} 0.1(syst)] x 10{sup -5}. A detailed study of the {pi}{sup +}{pi}{sup -}{pi}{sup 0} mass distribution from X(3872) decay favors a negative-parity assignment but does not rule out the positive-parity hypothesis.« less
  • We present preliminary simulation results for the I = 0 charmonium statemore » $$X(3872)(1^{++})$$ and the I = 1 charmonium state $$Z_c^+(3900)(1^{+-})$$. The study is performed on gauge field configurations with 2+1+1 flavors of highly improved staggered sea quarks (HISQ) with clover (Fermilab interpretation) charm quarks and HISQ light valence quarks. Since the $X(3872)$ lies very close to the open charm $$D \bar D^*$$ threshold, we use a combination of $$\bar c c$$ and $$D \bar D^* + \bar D D^*$$ interpolating operators. For the $$Z_c^+(3900)$$ we use a combination of $$J/\psi \pi$$ and $$D \bar D^* + \bar D D^*$$ channels. This is the first such study with HISQ sea quarks and light valence quarks. To this end, we describe a variational method for treating staggered quarks that incorporates both oscillating and non-oscillating components.« less