A Study of B→c$\bar{c}$γK in the BaBar Experiment Page: 38 of 224
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2.5. Recent Experimental Results
0.9 MeV/c2 and confirmation that the decay proceeds via X - DOD*O. This
mass value is roughly 4.5c- above the mass of the X(3872) as measured in
X(3872) - J/r+tr-. A recent higher statistics update from Belle pre-
sented at conference [43] also favours the decay X - DOD*O, although the
mass value of 3872.6g.4 0.4 MeV/c2 is much closer to that of the X(3872).
It is generally agreed [44, 45] that a mass shift at this level is still consistent
with a single X(3872) state.
The B Factories have conducted several other searches for the X(3872)
decays, though all have returned null results and upper limits only. These
include X(3872) - J/4'r [46], X(3872) - DD [47], X(3872) - Xcl,27 [3],
and X(3872) - J/7r-r0 [48].
Most of the experimental evidence at this time suggests that the X(3872)
state is a DOD* molecule, but the results are not entirely conclusive. Full
details of the theoretical interpretations of the X(3872) are discussed in
Section 2.6.
2.5.2 The X/Y/Z Family
Following the discovery the X(3872), three more charmonium-like states
were discovered by Belle in a similar mass region but via distinct produc-
tion methods and decay modes. All three states have possible conventional
charmonium model interpretations.
A resonance with a mass of m(X) = 3942 8 MeV/c2, called the X(3940),
was discovered by the recoil of the J/& in the double-charmonium pro-
duction of e+e- - J/&X(3940) and confirmed in decays to DOD* (but
not DD) [49]. Observation of an additional state with a mass of m(X) _
4156 29 MeV/c2 was also claimed by Belle [50]. Given the production
mechanism and the decays to DOD*O, the most obvious quantum number
assignment is JPC = 0-+, implying iSo charmonium. However, the masses
of both observations are inconsistent with charmonium model predictions.
The X(3940) is at least 100 MeV/c2 below the flc(3S) expectation, while the
X(4160) is similarly above this value yet ~ 300 MeV/c2 below the predicted
mass for the next excited state, flc(4S).16
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Fulsom, Brian Gregory. A Study of B→c$\bar{c}$γK in the BaBar Experiment, thesis or dissertation, April 1, 2009; United States. (https://digital.library.unt.edu/ark:/67531/metadc1013348/m1/38/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.