Transcript Search for X(3872) p0p0J/y

Update on angle studies of the
X(3872)
S.K. Choi & S.L. Olsen
Jan 21, 2005 Belle charmonium group video Meeting
(Jan 20 in Hawaii)
PC
J
for J ≤ 2
0
-+
0
++
0
+0
Violates
parity
OK
(hc”)
DD
allowed
exotic
-1
-+
1
++
1
+1
DD
allowed
exotic
OK
(cc1’)
OK
(hc’)
-2
-+
2
++
2
+2
OK
OK
(h2)
DDallow’d
exotic
(y2)
(cc2’)
can we just dismiss
-1
?
K.Seth hep-ph/0411122:
Proposes that the X(37872) is a vector glueball,
i.e. ggg with small cc mixture. DD decays are
not seen because gggcq + cq is small
-1
1--: sin2qKm
qK m
compute angles in
J/y restframe
K
D.V. Bugg hep-ph/0410168v2
data
y’: c2/dof = 8.9/9
X: c2/dof = 60.3/9
y’ is 1--
X(3872) is not!
PC
J
for J ≤ 2
0
-+
0
++
0
+0
Violates
parity
OK
(hc”)
DD
allowed
exotic
-1
-+
1
++
1
+1
DD
allowed
exotic
OK
(cc1’)
OK
(hc’)
-2
-+
2
++
2
+2
OK
OK
(h2)
DDallow’d
exotic
(y2)
(cc2’)
Summary
• Thanks to Rosner & Bugg we can learn a lot
from ang. distributions with only ~50 events
• Rule out 0 -+, 0++ , 1+- and 1-• 2 - - seems unlikely (c2/dof = 23/9)
• 1++ looks good
– only non-exotic assignment left with J≤1
– 1++ is favored by molecular models