Measurement of the Dipion Mass Spectrum in the Decay X(3872) -> J/psi pi+ pi- at the CDF II Experiment Metadata

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Title

  • Main Title Measurement of the Dipion Mass Spectrum in the Decay X(3872) -> J/psi pi+ pi- at the CDF II Experiment

Creator

  • Author: Rakitin, Alexander Y.
    Creator Type: Personal
    Creator Info: /MIT

Contributor

  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization
    Contributor Info: USDOE

Publisher

  • Name: Fermi National Accelerator Laboratory
    Place of Publication: Batavia, Illinois
    Additional Info: Fermi National Accelerator Laboratory (FNAL), Batavia, IL

Date

  • Creation: 2005-06-01

Language

  • English

Description

  • Content Description: The author presents a measurement of the dipion mass spectrum in the decay X(3872) {yields} J/{psi}{pi}{sup +}{pi}{sup -} using a 360 pb{sup -1} sample of p{bar p} collisions at {radical}s = 1.96 TeV collected with the CDF II detector at the Fermilab Tevatron Collider. As a benchmark, they also extract the dipion mass distribution for {psi}(2S) {yields} J/{psi}{pi}{sup +}{pi}{sup -} decay. The X(3872) dipion mass spectrum is compared to QCD multipole expansion predictions for various charmonium states, as well as to the hypothesis X(3872) {yields} J/{psi}{rho}{sup 0}. They find that the measured spectrum is compatible with {sup 3}S{sub 1} charmonium decaying to J/{psi}{pi}{sup +}{pi}{sup -} and with the X(3872) {yields} J/{psi}{rho}{sup 0} hypothesis. There is, however, no {sup 3}S{sub 1} charmonium state available for assignment to the X(3872). The multipole expansion calculations for {sup 1}P{sub 1} and {sup 3}D{sub J} states are in clear disagreement with the X(3872) data. For the {psi}(2S) the data agrees well with previously published results and to multipole expansion calculations for {sup 3}S{sub 1} charmonium. Other, non-charmonium, models for the X(3872) are described too. They conclude that since the dipion mass spectrum for X(3872) is compatible with J/{psi}{rho}{sup 0} hypothesis, the X(3872) should be C-positive. This conclusion is supported by recent results from Belle Collaboration which observed X(3872) {yields} J/{psi}{gamma} decay. They argue that if X(3872) is a charmonium, then it should be either 1{sup 1}D{sub 2{sup -+}} or 2{sup 3}P{sub 1{sup ++}} state, decaying into J/{psi}{pi}{sup +}{pi}{sup -} in violation of isospin conservation. A non-charmonium assignment, such as D{bar D}* molecule, is also quite possible.
  • Physical Description: 162 pages

Subject

  • Keyword: Quantum Chromodynamics Experiment-Hep, Phenomenology-Hep
  • Keyword: Multipoles
  • Keyword: Decay
  • Keyword: Charmonium
  • Keyword: Fermilab Tevatron
  • STI Subject Categories: 43 Particle Accelerators
  • Keyword: Experiment-Hep, Phenomenology-Hep
  • Keyword: Mass Distribution
  • Keyword: Hypothesis
  • STI Subject Categories: 72 Physics Of Elementary Particles And Fields
  • Keyword: Fermilab Collider Detector
  • Keyword: Isospin

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Thesis or Dissertation

Format

  • Text

Identifier

  • Report No.: FERMILAB-THESIS-2005-25
  • Grant Number: AC02-76CH03000
  • Office of Scientific & Technical Information Report Number: 15020139
  • Archival Resource Key: ark:/67531/metadc1404725
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