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Search for narrow resonances below the Υ mesons

G. Apollinari, M. Barone, W. Carithers, M. Dell’Orso, T. Dorigo, I. Fiori, M. Franklin, P. Giannetti, P. Giromini, F. Happacher, S. Miscetti, A. Parri, F. Ptohos, and G. Velev
Phys. Rev. D 72, 092003 – Published 16 November 2005
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  • INTRODUCTION
  • CDF DETECTOR
  • SEARCH FOR NARROW RESONANCES
  • DIMUON DATA SAMPLE
  • BACKGROUND REDUCTION
  • ESTIMATE OF THE UPPER LIMIT ON Γlε
  • STUDY OF THE 7.25  GeV/c2 FLUCTUATION
  • CONCLUSIONS
  • ACKNOWLEDGEMENTS
    • References

    Abstract

    We have investigated the invariant mass spectrum of dimuons collected by the CDF experiment during the 1992–1995 run of the Fermilab Tevatron collider to improve the limit on the existence of narrow resonances set by the experiments at the SPEAR e+e− collider. In the mass range 6.3−9.0  GeV/c2, we derive 90% upper credible limits to the ratio of the production cross section times muonic branching fraction of possible narrow resonances to that of the Υ(1S) meson. In this mass range, the average limit varies from 1.7 to 0.5%. This limit is much worse at the mass of 7.2  GeV/c2 due to an excess of 250±61 events with a width consistent with the detector resolution.

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    • Received 10 August 2005

    DOI:https://doi.org/10.1103/PhysRevD.72.092003

    ©2005 American Physical Society

    Authors & Affiliations

    G. Apollinari2, M. Barone1, W. Carithers4, M. Dell’Orso5, T. Dorigo6, I. Fiori5, M. Franklin3, P. Giannetti5, P. Giromini1, F. Happacher1, S. Miscetti1, A. Parri1, F. Ptohos1,*, and G. Velev2

    • 1Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, Frascati, Italy
    • 2Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
    • 3Harvard University, Cambridge, Massachusetts 02138, USA
    • 4Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
    • 5Istituto Nazionale di Fisica Nucleare, University and Scuola Normale Superiore of Pisa, I-56100 Pisa, Italy
    • 6Istituto Nazionale di Fisica Nucleare, Universita di Padova, Sezione di Padoova, I-35131, Padova, Italy

    • *Present address: University of Cyprus, 1678 Nicosia, Cyprus.

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    Issue

    Vol. 72, Iss. 9 — 1 November 2005

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    Images

    • Figure 1
      Figure 1
      Invariant mass distribution of all muon pairs. OS indicate dimuons with opposite sign charge used in this analysis. Dimuons with same sign charge (SS) are also shown.Reuse & Permissions
    • Figure 2
      Figure 2
      Invariant mass distributions of muon pairs at the Υ(1S) (a) and in the region of interest for this study (b). The solid line represents the fit used to estimate the number of Υ(1S) mesons.Reuse & Permissions
    • Figure 3
      Figure 3
      Invariant mass distributions of opposite (•) and same sign charge (dot-dashed) muon pairs in the Υ(1S) mass range after the isolation (a) and impact parameter cuts (b). The solid line is a fit using a Gaussian plus a first order polynomial functions.Reuse & Permissions
    • Figure 4
      Figure 4
      Invariant mass distribution of opposite (•) and same sign charge (dot-dashed) muon pairs which pass the isolation and impact parameter cuts. The solid line represents the fit described in Sec. 7.Reuse & Permissions
    • Figure 5
      Figure 5
      Bayesian 90% upper limit to σεB(ε→μμ)σΥ(1S)B(Υ(1S)→μμ) as a function of the ε mass.Reuse & Permissions
    • Figure 6
      Figure 6
      Bayesian 90% upper limit to Γlε (histogram). The dashed and dotted lines represent the leptonic widths of 1-- bound states of scalar quark predicted in Refs. 5, 9, respectively.Reuse & Permissions
    • Figure 7
      Figure 7
      Distribution of Nε/σN (see text). The solid line is a Gaussian function with unit width.Reuse & Permissions
    • Figure 8
      Figure 8
      Invariant mass distributions of muon pairs after applying the first and second cuts described in Table . The solid line is a fit to the data described in the text.Reuse & Permissions
    • Figure 9
      Figure 9
      Invariant mass distributions of opposite sign charge muon pairs after applying the third cut described in Table .Reuse & Permissions
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