Charmonium and Charmonium-Like States with BaBar Page: 3 of 4
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Charmonium and charmonium-like states with BABAR Elisa Guido
0~~ (a) (bdlLL
. C) - Fit function
w- Nonresonan2a0 1 C P-
0 _ _ . _ _ _ _ _ _ _ _ _ _ ,.. . . .. . . 2
2400 -(H2 -;
w 1 ___________________
4 4.2 4.4 46 4 8 0.7/ 0.76 0.78
Figure 1: The mj/, distribution (a) for B+ decay, (b) for the low-mass region in detail, and (c) for B0 decay.
In each case, the curves indicate the fit result. The m3 distribution for events with 3.8625 < mJ/ y < 3.8825
GeV/c2 is shown in (d) for B+ decay, (e) B0 decay, and (f) for the combined distributions. The vertical dashed
line represents the nominal w> mass. In (f), the solid (dashed) histogram represents the mgr distribution for
MC J/lao P-wave (S-wave) events.
3. Observation of ri (1S,2S) -> K+K- -+--n0 in two-photon interactions
The ne(1S,2S) are established states in the charmonium spectrum, but many of their prop-
erties, especially for the ne(2S), are not established. In the analysis presented here we study the
two-photon process e+e- _ yye+e- _ fe+e-, where f is either a KSK--T or a K+K- + -o
final state. The e+e- pair in the final state remains undetected, and the two photons are quasi-real. e
This implies that the allowed JPC values of the initial state are 0-+,2++, with J > 2 suppressed by
decay phase space. The final state KSK--T cannot have JP = 0+. The KS is reconstructed in the
KS - + - mode, and the w0 via decay to two photons. All of the available integrated luminosity
(519.2 fb) is used for this study.
Background contributions come from random combinations of particles from e+e- annihi-
lation, other two-photon collisions, and processes involving initial state radiation (such as J/yi
production). The signal is identified by the number of charged tracks in the final state, the number
of additional reconstructed photons, the transverse momentum distribution and the missing mass
of the event. The signals are extracted by means of a binned maximum-likelihood fit to the invari-
ant mass distributions of final state particles, which are shown in Fig. 2. Each fit contains several
components: the ne(1S,2S), the xco,2(1P), and the non-resonant and resonant backgrounds. All
the signal yields are corrected for the presence of peaking backgrounds. No signal is found for the
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Guido, Elisa. Charmonium and Charmonium-Like States with BaBar, article, March 14, 2014; United States. (digital.library.unt.edu/ark:/67531/metadc864635/m1/3/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.