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The BELLE Experiment RECFA Meeting 2004 / Innsbruck -3]mc 32by[k KEK, ce^ Tokyo The BELLE Experiment The Experiment The Physics Overview of Newest Results.

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Presentation on theme: "The BELLE Experiment RECFA Meeting 2004 / Innsbruck -3]mc 32by[k KEK, ce^ Tokyo The BELLE Experiment The Experiment The Physics Overview of Newest Results."— Presentation transcript:

1 The BELLE Experiment RECFA Meeting 2004 / Innsbruck -3]mc 32by[k KEK, ce^ Tokyo The BELLE Experiment The Experiment The Physics Overview of Newest Results Collaboration

2 The BELLE Experiment RECFA Meeting 2004 / Innsbruck -3]mc 32by[k L peak = 1.2 x10 34 cm -2 sec -1 design = 10 34 cm -2 sec KEKB Collider e-e- 8GeV e+e+ 3.5GeV = 0.425 B-Factory (on the 4s resonance) B-Factory (on the 4s resonance) BB threshold BB threshold

3 The BELLE Experiment RECFA Meeting 2004 / Innsbruck -3]mc 32by[k SVD The BELLE Detector

4 Difference SVD1.6 and SVD2.0 6+12+18+18=54 Ladders 8+10+14=32 Ladders SVD1 SVD2 R beampipe 15 mm R beampipe 20 mm R layer 1 30 mm R layer 1 20 mm R outside 60 mm R outside 88 mm

5 R-Z Trigger R-PHI Trigger2 x 18 FADCTF Trigger outputs L1.5 Trigger outputs 24 input OR and analog signal input from VATA Fast conn ectio n to PCI bus Multi event buffer Vienna R/O & Trigger Electronics

6 KVF KVF tends to use more bad measurements, and also use less good measurements DAF DAF uses more measurements in total, moderately weighted rightly rejected rightly accepted falsely rejected falsely accepted association weight Deterministic annealing filters for robust vertexing in BELLE

7 performance overview tag-side reconstruction (MC) initial KVF fit, cut on χ² prob < 1% histogram range: [- 600; +600] µ m DAF best resolution of DAF : 107.7 ± 1.43 µ m KVF best resolution of KVF : 115.5 ± 1.59 µ m DAF DAF resolution at its highest eff.: 111.5 ± 1.34 µ m @ 6903 KVF : KVF resolution at its highest eff.:: 128.1 ± 1.61 µ m @ 6306 Efficiency gain of appox. 6 – 16% Precision gain between: 16.6 ± 2.09 µ m and 4 ± 2.08 µ m

8 The BELLE Experiment RECFA Meeting 2004 / Innsbruck -3]mc 32by[k The Physics of BELLE self-consistent if SM correct V tb *V td V cb *V cd unitarity triangle V ub *V ud V cb *V cd V tb *V td V cb *V cd + 1 += 0 ii {i=1,k=3}: V ub *V ud +V cb *V cd +V tb *V td = 0 d s b u V ud V us V ub c V cd V cs V cb t V td V ts V tb CKM-Matrix 1 i 0 B 0 ->ππ B 0 -> π B 0 ->J/ K s B 0 -> K s B 0 ->D ( * ) D ( * ) B 0 -> D*π B 0 ->D* B 0 ->D* B->D CP K V ub *V ud V cb *V cd 1 2 3

9 The BELLE Experiment RECFA Meeting 2004 / Innsbruck -3]mc 32by[k Principle of 1 -Measurement with B J/ K s t z/(cβγ) Flavor-tag decay (B 0 or B 0 ?) J/ KSKS B - B B + B e e more Bs z t=0 f CP

10 The BELLE Experiment RECFA Meeting 2004 / Innsbruck -3]mc 32by[k sin2 1 (Belle 2003, 140 fb -1 ) =0.733±0.057±0.028 sin2 1 (BaBar 2002, 81 fb -1 ) =0.741±0.067±0.033 collected 200/fb integrated luminosity until March 2004 corresponding to 190 millionen B-events Overview of New Results CP = +1 sample sin2 1 = 0.80±0.13 CP = -1 sample sin2 1 = 0.73±0.06

11 The BELLE Experiment RECFA Meeting 2004 / Innsbruck -3]mc 32by[k New Physics in B K s ? B K s theoretically clean A = -0.15 ± 0.29 ± 0.07 sin2 1eff = –0.96 ± 0.50 3,5 deviation from precision result! SM predicts same CPV in b ccs and sqq. SM predicts same CPV in b ccs and sqq. New physics may deviate CPV in b ccs from sqq + SM penguin Hint of new physics New process w/ different CP phase

12 The BELLE Experiment RECFA Meeting 2004 / Innsbruck -3]mc 32by[k B 0 K S B 0 K K K S B 0 K S f S A B f CP (sqq) decay vertices are reconstructed using K- or -track pair. Fit sin2 1 @ 152M BB Comparison of several channels

13 The BELLE Experiment RECFA Meeting 2004 / Innsbruck -3]mc 32by[k New Charmonium Resonance ? found in channel B ± K ± (J/ ) mass: 3871.8±0.7±0.4 MeV natural width < 3.5 MeV @ 90% C.L. 34.4±6.5 events, statist. significance 8.6 (2S) M(J/ ) - M(J/ ) GeV Belle 304M Bs

14 The BELLE Experiment RECFA Meeting 2004 / Innsbruck -3]mc 32by[k Vienna Analysis - Motivation |V ub | can be measured in B l requires knowledge of form factor f B (q 2 ) analoguous form factor f D (q 2 ) can be measured in D l ratio f B /f D is theoretically better known than absolute value reduction of theoretical error

15 The BELLE Experiment RECFA Meeting 2004 / Innsbruck -3]mc 32by[k K D D* mass- / vertex fit e+e- 3.5 GeV8 GeV K K D* D e/µ Method of full inclusive reconstruction inverse fit additional primary mesons

16 The BELLE Experiment RECFA Meeting 2004 / Innsbruck -3]mc 32by[k Overview of Vienna Charm Analyses What we are going to do with the data: semileptonic form factors - f + D (q²) for D l -may be used to reduce systematic error on f + B (q²) for |V ub | measurement -high resolution q² distribution for D l cross sections for D*D*(n ) -various channels: D*D*, D*D*, D*D*KK, D*D*, D*D*, D*D*KK inclusive D decays BR -various channels, mostly poorly measured: -D K ± + anything -D e ± + anything -D µ ± + anything -D + anything Kl l m ² / GeV² R EAL D ATA reconstructed neutrino mass Statistics after bkg subtraction: D Kl 417 ± 20 events (4.8% stat 1.1% bkgsyst ) D l 45 ± 6 events (12.8% stat 5.4% bkgsyst )

17 The BELLE Experiment RECFA Meeting 2004 / Innsbruck -3]mc 32by[k l Analysis: q² distribution K/ l Analysis shapes of bkg derived from MC except for non-D bkg (from D* side-band data) bkg subtracted according to bkg measurement presented before efficiency correction slightly rising with q² for K, rather flat for our advantage: comparatively clean, high resolution sample corrected q² distribution q² / GeV² q² signal & background Kl l R EAL D ATA M C D ATA D l non-D bkg D l D hadronic form factor f+(q²) single-pole model arbitrary normalization q² / GeV² Kl l R EAL D ATA preliminary

18 The BELLE Experiment RECFA Meeting 2004 / Innsbruck -3]mc 32by[k Spares

19 The BELLE Experiment RECFA Meeting 2004 / Innsbruck -3]mc 32by[k Prinzip der 1 -Messung mittels B J/ K s keine theoretische Unsicherheit experimentell sauber goldener Kanal sin2 1 (NEW World Av.) =0.736±0.049 B0B0 B0B0 B0B0 V cb V tb V* V tb V* 2 td J/ KSKS KSKS V cb

20 The BELLE Experiment RECFA Meeting 2004 / Innsbruck -3]mc 32by[k Neue Physik in B K s ? sin2 1 (NEW World Av.) =0.736±0.049 Erst die Zukunft, mit mehr Statistik (und eventuell weiter verbesserter Analyse) wird die Antwort bringen! 70 ± 9 events BaBar Resultat von 2002: sin2 1eff = –0.18 ± 0.52 Resultat 2003: sin2 1eff = +0.45 ± 0.44 Grund für Verschiebung ist eine 1 statistische Fluktuation

21 The BELLE Experiment RECFA Meeting 2004 / Innsbruck -3]mc 32by[k Neue Charmonium Resonanz ? sin2 1 (NEW World Av.) =0.736±0.049 Interpretation: Masse gerade an der D 0 D *0 threshold lose gebundenes molecular charmonium, oder ein (1 3 D 2 ) Zustand? Discovery of the signal is very recent. Belle is working on this channel but is not ready to present any results (Lepton-Photon 2003) Ersteres in der Literatur diskutiert seit 1975: –ausgelöst durch komplizierte Struktur von ( e + e - ->hadrons ) bei SPEAR M. Bander, G.L. Shaw, P. Thomas, PRL 36, 695 (1976) M.B. Voloshin, L.B. Okun JETP Lett. 23, (1976), Pisma Zh.Eksp.Teor.Fiz.23, 369 (1976) A.De Rujula, H.Georgi, S.L.Glashow, PRL 38 (1977) –WW beschrieben durch -Austausch gibt attraktive Kraft für DD*, BB* N.A. Tornqvist, PRL 67, 556 (1991), Z.Phys. C61, 525(1994) A.V. Manohar, M.B. Wise,Nucl.Phys. B339, 17(1993) Q q Q q D 0 D *0 molecule Diquark Model (Qq) are colored Loose binding A different idea from that time: Decays to (QQ)+(light mesons) via quark rearrangement which suppresses the width. Stronger binding QQ qq

22 The BELLE Experiment RECFA Meeting 2004 / Innsbruck -3]mc 32by[k Next: 2 (α) from B f cp >= + V tb B0B0 B0B0 V* td tdtd V tb V ub + + B0B0 + V* 2 V 2 tdub

23 The BELLE Experiment RECFA Meeting 2004 / Innsbruck -3]mc 32by[k Constraints on the CKM angle φ 2 (α) S ππ, A ππ depend on 4 parameters: S ππ, A ππ depend on 4 parameters: 2, 1 [21.3°-25.9°], |P/T| [0.15-0.45], 2, 1 [21.3°-25.9°], |P/T| [0.15-0.45], -> plot confidence contours in ( 2, ) for various |P/T| -> plot confidence contours in ( 2, ) for various |P/T| e.g. e.g. |P/T|=0.3 1 =23.5° 1 =23.5° 2 Indirect constraints (CKM fitter group) : 78.3° 2 121.6° 78.3° 2 121.6° (95% C.L.) consistent Find: 78° 2 152° (95% C.L.) insensitive to

24 The BELLE Experiment RECFA Meeting 2004 / Innsbruck -3]mc 32by[k office of a Japanese physicist (complete with camping bed)


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