Precision Measurement of the X(3872) Mass in J/psi pi+ pi- Decays

CDF Collaboration; Victoria Martin

doi:10.1103/PhysRevLett.103.152001

Precision Measurement of the X(3872) Mass in J/psi pi+ pi- Decays

CDF Collaboration, Victoria Martin

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract / Description of output

We present an analysis of the mass of the X(3872) reconstructed via its decay to J/psi pi+ pi- using 2.4 fb^-1 of integrated luminosity from ppbar collisions at sqrt(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, the 95% confidence level upper limit on the mass difference is 3.6 MeV/c^2. Under the single-state model the X(3872) mass is measured to be 3871.61 +- 0.16 (stat) +- 0.19 (syst) MeV/c^2, which is the most precise determination to date.

Original language	English
Journal	Physical Review Letters
Volume	103
DOIs	https://doi.org/10.1103/PhysRevLett.103.152001
Publication status	Published - 2009

Keywords / Materials (for Non-textual outputs)

hep-ex

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10.1103/PhysRevLett.103.152001

http://arxiv.org/abs/0906.5218

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title = "Precision Measurement of the X(3872) Mass in J/psi pi+ pi- Decays",

abstract = "We present an analysis of the mass of the X(3872) reconstructed via its decay to J/psi pi+ pi- using 2.4 fb^-1 of integrated luminosity from ppbar collisions at sqrt(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, the 95% confidence level upper limit on the mass difference is 3.6 MeV/c^2. Under the single-state model the X(3872) mass is measured to be 3871.61 +- 0.16 (stat) +- 0.19 (syst) MeV/c^2, which is the most precise determination to date.",

keywords = "hep-ex",

author = "{CDF Collaboration} and Victoria Martin",

note = "FERMILAB-PUB-09-330-E, Article Number 152001",

year = "2009",

doi = "10.1103/PhysRevLett.103.152001",

language = "English",

volume = "103",

journal = "Physical Review Letters",

issn = "1079-7114",

publisher = "American Physical Society",

}

TY - JOUR

T1 - Precision Measurement of the X(3872) Mass in J/psi pi+ pi- Decays

AU - CDF Collaboration

AU - Martin, Victoria

N1 - FERMILAB-PUB-09-330-E, Article Number 152001

PY - 2009

Y1 - 2009

N2 - We present an analysis of the mass of the X(3872) reconstructed via its decay to J/psi pi+ pi- using 2.4 fb^-1 of integrated luminosity from ppbar collisions at sqrt(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, the 95% confidence level upper limit on the mass difference is 3.6 MeV/c^2. Under the single-state model the X(3872) mass is measured to be 3871.61 +- 0.16 (stat) +- 0.19 (syst) MeV/c^2, which is the most precise determination to date.

AB - We present an analysis of the mass of the X(3872) reconstructed via its decay to J/psi pi+ pi- using 2.4 fb^-1 of integrated luminosity from ppbar collisions at sqrt(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, the 95% confidence level upper limit on the mass difference is 3.6 MeV/c^2. Under the single-state model the X(3872) mass is measured to be 3871.61 +- 0.16 (stat) +- 0.19 (syst) MeV/c^2, which is the most precise determination to date.

KW - hep-ex

U2 - 10.1103/PhysRevLett.103.152001

DO - 10.1103/PhysRevLett.103.152001

M3 - Article

SN - 1079-7114

VL - 103

JO - Physical Review Letters

JF - Physical Review Letters

ER -

Precision Measurement of the X(3872) Mass in J/psi pi+ pi- Decays

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