Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 1 Hot Topics from Belle May 5, 2008, NTU, Taipei.

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Presentation transcript:

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 1 Hot Topics from Belle May 5, 2008, NTU, Taipei

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 2 Outline Backdrop Starting a Zoo ; Bottom Up Dataset on  (5S)  (nS) h + h  Event Distributions M(  ) vs M(  hh) ― M(  ) M(  ) & cos  Hel ; Dalitz The Scan Summary

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 3 Backdrop a New Zoo Bottoming it up

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 4 Starting a Zoo: X S.-K. Choi, S.L. Olsen, et al. 351 citations

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 5 Starting a Zoo: Y I sat through this SLAC Expt’l Seminar... PRL 95, (2005) 164 citations couldn’t shake thinking for two weeks...

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 6 J/   +   4-quark state?Molecule?Hybrid?    broad     w/ large Y(4260)

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 7 the buzz at FPCP06 Why not bb, methought...

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 8 Bottom Up Conceived during FPCP2006 April ’06 in Vancouver YbYbYbYb XbXbXbXb

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 9 Bottom Up

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 10 Motivation II: Enhancement? ❀ ❀ ~ 1 fb 

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 11 Dataset on  (5S) additional personal stimulus

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 12 Dataset on  (5S) 1985: CLEO, CUSB ~ 0.1 fb  2003: CLEO III 0.43 fb  1  ( 5S ) (4S)(4S) Belle 2005: ⊳ scan 30 pb  1 each 10825, 10845, 10865, 10885, ⊳ engineering run ~ 1.9 fb  1 June ≅ 21.7 fb  1 Main Purpose: B s physics Complex Structure above Threshold e.g. B s →  J. Wicht et al., PRL ’08

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/ countries, 55 institutes, ~400 collaborators IHEP, Vienna ITEP Kanagawa U. KEK Korea U. Krakow Inst. of Nucl. Phys. Kyoto U. Kyungpook Nat’l U. EPF Lausanne Jozef Stefan Inst. / U. of Ljubljana / U. of Maribor U. of Melbourne BINP Chiba U. U. of Cincinnati Ewha Womans U. Fu-Jen Catholic U. U. of Giessen Gyeongsang Nat’l U. Hanyang U. U. of Hawaii Hiroshima Tech. IHEP, Beijing IHEP, Moscow Nagoya U. Nara Women’s U. National Central U. National Taiwan U. National United U. Nihon Dental College Niigata U. Nova Gorica Osaka U. Osaka City U. Panjab U. Peking U. Princeton U. Riken Saga U. USTC Seoul National U. Shinshu U. Sungkyunkwan U. U. of Sydney Tata Institute Toho U. Tohoku U. Tohuku Gakuin U. U. of Tokyo Tokyo Inst. of Tech. Tokyo Metropolitan U. Tokyo U. of Agri. and Tech. INFN Torino Toyama Nat’l College VPI Yonsei U. Belle Collaboration

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 14 e + source Ares RF cavity Belle detector World record: L = 1.71 x /cm 2 /sec SCC RF(HER) ARES(LER) 8 x 3.5 GeV 22 mrad crossing ~ 1 km in diameter Mt. Tsukuba KEKB Belle since 1999 The KEKB Collider

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 15   / K L detection 14/15 lyr. RPC+Fe Central Drift Chamber small cell +He/C 2 H 6 CsI(Tl) Aerogel Cherenkov Counter n=1.015~1.030 Si Vertex Detector 3(4) lyr. DSSD TOF SC Solenoid 1.5T 8 GeV e  3.5 GeV e  16X  ACC (PID) ECL SVD KLM CDC Belle Detector

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 16  (nS) h + h  Event Distributions h = , K

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 17 Event Selection for  (nS) h + h   Track Prompt: within 5 cm of IP in z (beam direction) 1 cm in transverse       h  h    X 0 Muon ID;loose h = , K No other charged tracks with p T > 100 MeV/c 2  |M(      - M(  (nS))| < 150 MeV/c 2 (3  )  (nS) candidate  cos  < 0.95  reject e  ’s faking   ’s Electron ID  h = K case Kaon ID Main bkg :  +       +    e + e  that mimic  (1S)e + e  Main bkg :  +       +    e + e  that mimic  (1S)e + e  (conversions) Remark: Looser than  (4S)   (1S)  +   analysis Crosschecks w/  (4S) and  (3S)  M(     )  M = M(     h  h  ) ― M(     )

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 18 Expectation for  (5S) →  (nS) h + h  expect O (1) events for 22 fb  1 ~ 1.7 x 10  fb  1  (4S)  (5S)  ee ≃ 0.27 keV 20.5  ≃ 20.5 MeV Mass MeV    ee ≃ keV 110   ≃ 110 MeV Mass MeV 9 x 10  5

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 19 Dominant Background at kinematic boundary: e  e  →      ( → e  e   21.7 fb  1 on 5S M(     ) vs  M Distributions Signal regions 1S 3S 2S Signal regions Signal box to optimize on background

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 20 “  (5S)”   (1S)  +  ,  (2S)  +    (2S)  +    (1S)  +   Striking ! “  (5S)” Striking ! expect O (1) events “  (5S)” “  (5S)” : single E CM at GeV Not clear whether  (5S) itself. 2S 3S 4S  (4S)   (1S)  +   Expect to vanish >

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 21 Remarks  Structure below  (3S): “  (5S)” →  (2S)  +   ↳  (1S)+X (including  b )  e + e    (1S)  +   > “  (5S)” “  (5S)”  “  (5S)” : single E CM energy at GeV No clear indication of radiative tail radiative return

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 22 Signal Extraction  (2S)  +    (1S) K + K  4.9   (3S)  +   14   (1S)  +   20       N s N s : Signal Yield N b N b : Bkgnd Yield by unbinned ML fit to   M few hundred signal events 3.2  Signal box to optimize on bkgnd

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 23 Brown-Cahn Model phase space M(  ) and cos  Hel Distributions  (1S)  +    (2S)  +   cos  Hel CLEO’07 Double-(triple-)peak structure ~  (3S) and  (4S) cases  (1S)  +    (2S)  +   Scalar Resonance ? Meng & K.T. Chao, PRD ’08 seems — seems insufficient insufficient

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 24  Dalitz Plot: Z  (4430) Echoes?  (1S)  +    (2S)  +   Karliner & Lipkin, arXiv: [hep-ph] Lighter than 2m B ? S.-K. Choi, S.L. Olsen et al., PRL ’08 cf. Cheung, Keung, Yuan, PRD ’07: ~ Nondescript ? M(   + ) M(  ’  + )  M(     )  M(  ’    ) Too Early to Tell ! ’’ Need more Data.

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 25 Results: Xsection, BF &   (  (5S)) = ± nb ∫ L dt = 21.7 fb  Cf.  (2S)   (1S)     ~ MeV  (3S) “ ” MeV  (4S) “ ” MeV Echoes Y(4260) Is this anomalous  (5S), or due to the Y b state? Assume “  (5S)” =  (5S) PDG value taken for  (nS) properties Need Scan to tell N.B.   (5S)  e  e  ≃ keV seem normal over 100 x larger 88 MeV tiny > MeV

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 26 The Scan

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/ Hadronic Scan Special Energy Scan: Dec. 6-17, 2007 KEB Control Room  ~ 7.9 fb  over 6 energy points Compare  (1S)  +  ,   (2S)  +   vs E CM w/ Hadrons vs E CM   could be Y b  5S  - Y b mixture  (2S)  +  

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 28 Y(4360) = Y(4320) ? Y(4360) = Y(4320) ? Y(4660) ! Y(4660) ! Two Y’s ? PRL99, (2007) PRL99, (2007) PRD77, (2008) (RC)

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/ Hadronic Scan Special Energy Scan: Dec. 6-17, 2007 KEB Control Room  ~ 7.9 fb  over 6 energy points Compare  (1S)  +  ,   (2S)  +   vs E CM w/ Hadrons vs E CM Could have rich structure ! Results coming soon!

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 30 Y(4260) Interference pattern ? We are exploring a mass region with many open-flavor thresholds ! Need more data ! A Super B Factory can study in detail.

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 31  Observe anomalous  (1S)  and  (2S)  production, and evidence for  (3S)  and  (1S) KK near  (10865). Large partial widths suggest bottom counter part of Y(4260) overlaps with, or is near the  (5S). Energy Scan carried out 12/07, results ready soon. Summary PRL100, (2008) Cf. ~ MeV for  (4S)   (1S)  +   Xsec (pb) BF (%)  (MeV) “  (5S) ”   (1S)  +    “  (5S) ”   (2S)  +                                               Assuming from  (5S) Y b not yet bagged for augmenting Zoo but tracks spotted YbYb YbYb YbYb YbYb YbYb YbYb YbYb and trailed

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 32

Hot Belle George W.S. Hou (NTU) FPCP08, 5/5/08 33 Systematic Uncertainty Source Source  (1S)  +    (2S)  +    (3S)  +    (1S) K + K  Tracking 4.1% 4.6% 5.6% 4.1% Lepton Ident. 1.0% 1.0% 1.0% 1.0% Electron rejection 0.2% 0.2% 0.4% 3.6% Fitting 1.5% 3.7% 1.7% 1.4%  model 4.4% 6.8% 3.2% 13.6% M(  ) selection 2.6% 2.6% 2.6% 2.6% Bhabha rejection 1.9% 1.9% 1.9% 1.9% Trigger 0.9% 3.1% 4.5% 1.0% Luminosity 1.4% 1.4% 1.4% 1.4% Cross-section 5.0% 5.0% 5.0% 5.0%  (nS) →  bf 2.0% 8.8% 9.6% 2.0% Total 9.0% 14.4% 14.0% 16.1%