Aaltonen, T;
Adelman, J;
Akimoto, T;
Gonzalez, BA;
Amerio, S;
Amidei, D;
Anastassov, A;
... CDF Collaboration; + view all
(2009)
Precision Measurement of the X(3872) Mass in J/psi pi(+)pi(-) Decays.
Physical Review Letters
, 103
(15)
, Article 152001. 10.1103/PhysRevLett.103.152001.
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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 p (p) over bar collisions at 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, 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.
| Type: | Article |
|---|---|
| Title: | Precision Measurement of the X(3872) Mass in J/psi pi(+)pi(-) Decays |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.103.152001 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.103.152001 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | DETECTOR |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/131740 |
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