A Study of B→c$\bar{c}$γK in the BaBar Experiment Page: 2 of 224

The BABAR Collaboration is a high energy physics experiment located at the
Stanford Linear Accelerator Center. The primary goal of the experiment is
to study charge and parity violation in the B-meson sector, however the
copious production of B mesons decaying to other final states allows for a
wide-ranging physics program. In particular, one can access the charmonium
system via colour-suppressed b - c decays of the type B - cJK.
This thesis presents a study of B - ccEyK decays where cc includes
J/ and (2S), and K includes K+, K and K*(892). The particular
emphasis is on a search for the radiative decays X(3872) - J/fry and
X(3872) - (2S)2. The X(3872) state is a recently-discovered resonance of
undetermined quark composition, speculatively a conventional charmonium
state or exotic four-quark di-meson molecule. This research is also sensitive
to the well-known radiative charmonium decays B - Xc1,2K, which are used
as verification for the analysis technique.
This dissertation sets the best B - xc1K branching fraction measure-
ments to date, and sees the first evidence for factorization-suppressed B0 -
Xc2K*o decay at a level of 3.6c-. It also provides evidence for X(3872)
J/-y and X(3872) - (2S)-y with 3.6c- and 3.3c- significance, respectively.
The product of branching fractions 13(B+ - X(3872)K+) " 13(X(3872) -
J/@y) = (2.8 0.8(stat.) 0.2(syst.)) x 10-6 and 13(B+ - X(3872)K+)
13(X(3872) - (2S)2) = (9.5 2.7(stat.) 0.9(syst.)) x 10-6 are measured.
These results improve upon previous X(3872) - J/fry measurements, and
represent the first evidence for X(3872) - (2S)y.


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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/m1/2/ocr/: accessed April 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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