Charmonium above (3770) Study of resonance formation in energy
regime above (3770). CLEO probes direct production of new states
via coupling to electron-positron collisions Constrains possible
quantum numbers (as does production in ISR a la Belle/BaBar) Take
advantage of recent scan to locate peak of D s production
cross-section in region between 3.9-4.3 GeV c.o.m. and study new
charmonia. THANKS TO BRIAN HELTSLEY & HANNA MAHLKE-KRUGER, FROM
WHOM I SHAMELESSLY LIFTED SLIDES WHOLESALE! Slide 2 Charmonium,
retrospective J/ (3097) observation (1974) ushers in modern
heavy-quark era Spectroscopy of states below threshold generally
conforms to potential model expectations Belle ushers in new era
looking at mass recoiling against strange-meson states in exclusive
B-decays X(3872), etc Recent charmonium Renaissance; CLEO-c well
poised to contribute! Slide 3 (some) recent CLEO-c charmonium
papers Measurement of ee (J/ ), tot (J/ ), ee [ (2S)]/ ee (J/ )
hep-ex/0512046hep-ex/0512046 Two Photon Width of chi c2 (submitted
to PRL) Observation of the 1 P 1 State of Charmonium Phys. Rev.
Lett.95:102003,2005Phys. Rev. Lett.95:102003,2005 Measurement of
Branching Fractions for J/ l + l - Phys. Rev. D71:111103,2005 Phys.
Rev. D71:111103,2005 Branching Fractions for psi(2S) to J/psi
Transitions Phys. Rev. Lett.94:232002,2005 Phys. Rev.
Lett.94:232002,2005 Slide 4 Comment on J/ (3770) DDbar CLEO has now
determined (3770) DD/(3770) hadrons ECM=3671 MeV evt yield
(x1000)ECM=3770 MeV evt yield (x1000)
D(hadronic-DD)=(0.01+/-0.08+/-0.4) nb Open charm production nearly
saturates (3770)! Slide 5 (3770), cont. Almost saturates CLEO has
published: Dipion transitions to (1S) state, submitted PRL
Radiative transitions to c,1 state, submitted PRL But not hadronic
charmless modes (30 modes in two analyses) Phys.Rev. D73 (2006)
012002 Slide 6 Slide 7 Pre-CLEO cross-section tabulation (PDG)
Slide 8 Eric Swanson, hep-ph/0601110 Slide 9 How do dipion
transitions compete with allowed DD decays? Slide 10 CLEO study of
charmonia > (3770) Search in dipion (or even dikaon
transitions): X (J/ ; for both neutral and charged dipions. J/
decays leptonically, resulting in very clean & distinctive
final state. Complications: Tails of Breit-Wigner resonances lurk
everywhere E.g., some of observed (J/ final state at high energies
may be either tail of (2S) or ISR radiation to peak of (2S). Former
calculable, latter distinctive by missing energy /
momentum-imbalance carried by missing ISR photon (typically down
beampipe). Advantage: Opportunity to calibrate systematics Slide 11
Note: ISR photon not reconstructed; distinguishable on basis of
missing momentum Expectation Slide 12 Y(4260) reconstruction Data
taken directly on peak (13.2/pb), part of a scan of 3.97 4.26 GeV
center-of-mass range. Note: not enough data to measure intrinsic
width of putative resonance (88+/-23+/-5 MeV, BaBar) or mass
(4259+/-8 MeV, BaBar) Tabulate contributions to (J/ J l + l - final
state, look for excess beyond contribution expected from (2S) +
non-resonant processes Cut on missing momentum to exclude ISR (2S)
contributions Slide 13 ( (2S) ISR off-scale) Slide 14 Slide 15
Compile observed cross-section as function of c.o.m. energy Slide
16 Dipion mass distributions look Yan-like Slide 17 Search for 3
states in other modes Extend search to include many other modes,
including hadronic transitions to (2S), radiative and hadronic
transitions to c states, dipion transitions to phi, and other
hadronic transitions to J/ No signals found in any other modes;
upper limits set on (BR*cross-section) Slide 18 So. Slide 19 1.
hep-lat/0512029 [abs, ps, pdf, other] :abspspdfother Title: Y(4260)
on the lattice TWQCD Collaboration: Ting-Wai Chiu, Tung-Han Hsieh
TWQCD CollaborationTing-Wai ChiuTung-Han Hsieh 2. hep-ph/0511107
[abs, ps, pdf, other] :abspspdfother Title: The Y(4260) as an omega
chi_{c1} molecular state C.Z. Yuan, P. Wang, X.H. Mo C.Z. YuanP.
WangX.H. Mo 3. hep-ph/0510228 [abs, ps, pdf, other] :abspspdfother
Title: One Explanation for the Exotic State Y(4260) Cong-Feng Qiao
(GUCAS) Cong-Feng Qiao 4. hep-ph/0507177 [abs, ps, pdf, other]
:abspspdfother Title: Possible Molecular Structure of the Newly
Observed Y(4260) Authors: Xiang Liu, Xiao-Qiang Zeng, Xue-Qian
LiXiang LiuXiao-Qiang ZengXue-Qian Li 5. hep-ph/0507119 [abs, ps,
pdf, other] :abspspdfother Title: Suppressed decay into open charm
for the Y(4260) being an hybrid Authors: E. Kou, O. PeneE. KouO.
Pene 6. hep-ph/0507062 [abs, ps, pdf, other] :abspspdfother Title:
Four Quark Interpretation of Y(4260) Authors: L. Maiani, F.
Piccinini, A.D. Polosa, V. RiquerL. MaianiF. PiccininiA.D. PolosaV.
Riquer 7. hep-ph/0507025 [abs, ps, pdf, other] :abspspdfother
Title: The Possible Interpretations of Y(4260) Authors: Shi-Lin
ZhuShi-Lin Zhu Recent theoretical interest Slide 20 1.
hep-ph/0511005 [abs, ps, pdf, other] :abspspdfother Title:
Quark--antiquark states and their radiative transitions in terms of
the spectral integral equation. II. CharmoniaV. Anisovich,
L.Dakhno, M.Matveev, V.Nikonov, A.SarantsevV.
AnisovichL.DakhnoM.MatveevV.NikonovA.Sarantsev 2. hep-ph/0411291
[abs, ps, pdf, other] :abspspdfother Title: Leptonic widths of high
excitations in heavy quarkonia Authors: A.M. Badalian, A.I.
Veselov, B.L.G. BakkerA.M. BadalianA.I. VeselovB.L.G. Bakker 3.
hep-ph/0410361 [abs, ps, pdf, other] :abspspdfother Title: Charmed
quark component of the photon wave function Authors: V.V.
Anisovich, L.G. Dakhno, V.N. Markov, V.A. Nikonov, A.V.
SarantsevV.V. AnisovichL.G. DakhnoV.N. MarkovV.A. NikonovA.V.
Sarantsev 4. hep-ph/9507407 [abs, ps, pdf, other] :abspspdfother
Title: Do psi(4040), psi(4160) signal Hybrid Charmonium? Authors:
Frank E. Close, Philip R. PageFrank E. ClosePhilip R. Page And.
Slide 21 Summary Confirm BaBar e + e - Y(4260) J/ pb New
observations of e + e - Y(4260) J/ and e + e - Y(4260) J/ ( =23 +12
-8 pb and 9 +9 -5 pb) Similar dipion transitions from (4040) or
(4160) states not observed. Early results favor hybrid charmonium
interpretation. CLEO intends now to exhaustively study particle
production in this energy regime! Slide 22 Slide 23
