Properties of Exotic Charmonium-like States at CDF Page: 1 of 5
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Properties of Exotic Charmonium-like States at CDF
Kai Yil for the CDF Collaboration
1- University of Iowa - Dept of Physics and Astronomy
Iowa City, IA 52242-1489
We report the recent evidence for a new narrow structure, Y(4140), decaying to the
J/uq final state, in exclusive B+ -> J/uqK+ decays in a data sample corresponding
to an integrated luminosity of 2.7 fb-lcollected at the CDF II detector. This narrow
structure with its mass well above open charm pairs is unlikely to be a candidate for a
conventional charmonium state. From a study of the X(3872) mass and width based on
the world's largest sample of X(3872) -> J/cr+r- decays, we find that our X(3872)
signal is consistent with a single state, and leads to the most precise measurement of
the X(3872) mass.
The existence of exotic mesons beyond qq has been discussed for 30 years , but evidence
for such mesons has not been clearly established. The recently discovered states that have
charmonium-like decay modes  but are difficult to place in the overall charmonium system
have introduced challenges to conventional qj meson model. The possible interpretations
beyond qj such as hybrid (qqg) and four-quark states (qgqq) have revitalized interest in exotic
mesons in the charm sector . So far the observed states involve only c quark and light
quark (u, d) decay products, however, the J/pp final state is a good channel for an exotic
meson search which extends to c quark and heavy s quark decay products. An investigation
of the J/pp system produced in exclusive B+ -> J/ppK+ decays with J/ -> p>+- and
p -> K+K- is reported in this note. This analysis is based on a data sample of pp collisions
at s= 1.96 TeV with an integrated luminosity of 2.7 fb-- collected by the CDF II detector
at the Tevatron. Charge conjugate modes are included implicitly in this note.
It has been six years since the discov-
ery of X(3872), however, the nature of this CDF II Preliminary, 2.7 fb-1
state has not been clearly understood yet. 70000
Due to the closeness of the X(3872) mass *60000
with the threshold of D0 and D*0 the 5
X(3872) has been proposed as a molecule w
composed of D0 and D*0. The X(3872) 40
has also been speculated to be two states 00oo
nearby, as in some models like the diquark- 20000
antidiqurk model. It is critical to make pre- U10000
cise measurements of the mass and width yd22 5.24 5.26 5.28 5.30 5.32 .34
of X(3872) to understand its nature. The mJ/VQ. (GeV/c )
large X(3872) -> J/nr+r- sample accu-
mulated at CDF enables us to test the hy- Figure 1: The J/vpK+ mass before mini-
pothesis of that the X(3872) is composed mum Lay(B+) and kaon LLR requirements.
of two states and to make a precise mass
measurement of X(3872) if it is consistent with one state hypothesis.
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Yi, Kai & U., /Iowa. Properties of Exotic Charmonium-like States at CDF, article, June 1, 2009; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc927346/m1/1/: accessed July 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.