Results from Belle and Ba Bar Paoti Chang

Results from Belle and Ba. Bar Paoti Chang National Taiwan University Hadron Collider Physics Symposium 2005 4 -9 July 2005, Les Diablerets, Switzerland HCP 2005, 7 July P. Chang B Factory Results

CP Violation and CKM Matrix n CPV in SM arises from an irreducible complex phase. – Establish CPV in 2001 by Belle and Ba. Bar – Precise measurement of SM parameters n Is there only one weak phase? – Search for TCPV in other processes – Direct CP violation and rare decay n B meson properties HCP 2005, 7 July P. Chang B Factory Results 2

Asymmetric e+ e- Collider Piermaria Oddone (4 S) B 1 e+ e- B 2 m+ J/Y m. KS _ B 0 nm p- p m+ B 0 f. CP + K Flavor tag Dz ~ 200 mm HCP 2005, 7 July P. Chang B Factory Results 3

B Factory Performance Belle: Peak luminosity= 1. 58 *1034 cm-2 s-1; ~ 1 fb-1/day Ba. Bar: Peak luminosity~ 1 *1034 cm-2 s-1 Unexpected Shut down HCP 2005, 7 July P. Chang B Factory Results 4

Ba. Bar Detector Superconducting Coil (1. 5 T) Silicon Vertex Tracker (SVT)[5 layers] e+ (3 Ge. V) Drift Chamber [40 stereo lyrs](DCH) e- (9 Ge. V) Cs. I(Tl) Calorimeter (EMC) [6580 crystals]. Cherenkov Detector (DIRC) Instrumented Flux (IFR) [144 quartz bars, 11000 PMTs. Return ] [Iron interleaved with RPCs]. HCP 2005, 7 July P. Chang B Factory Results 5

Belle Detector Aerogel Cherenkov cnt. n=1. 015~1. 030 SC solenoid 1. 5 T 3. 5 Ge. V e+ Cs. I(Tl) 16 X 0 TOF counter 8 Ge. V e- EFC Si vtx. det. 3/4 lyr. DSSD HCP 2005, 7 July P. Chang m / KL detection 14/15 lyr. RPC+Fe B Factory Results 6

Results Measurements on the unitarity triangle – sin(2 1/b) from b ccs – sin(2 1/b)eff from b sss – 2/ and 3/g n Rare Decays and Direct CP Violation –B→tn – Radiative B decays – Hadronic B decays n See Abe and Forti’s talks @LP 05 for Vub measurements and other results. HCP 2005, 7 July P. Chang B Factory Results 7

Mixing Induced CP Violation Asymmetry occurs due to the interference between B 0 → f and B 0 → f. Theoretically clean measurement from J/y KS and other b →ccs decays. Sf = sin 2 1 for J/y KS HCP 2005, 7 July P. Chang B Factory Results 8

sin 2 1 /sin 2 b from B → J/y K 0 Nsig =5264 73 HCP 2005, 7 July P. Chang Nsig =4792 105 B Factory Results 9

sin 2 1/ sin 2 b Continue • HFAG Winter 2005 average: • Belle summer update (386 M BB pairs): • HFAG New average (preliminary) HCP 2005, 7 July P. Chang B Factory Results 10

Four-fold Ambiguity of 1 – sign ambiguity from the two choices of strong phases. – Ba. Bar resolves the ambiguity by examining the S wave and p wave interference near K*0 (89 M BB). – Belle assumes s-quark helicity conservation. HCP 2005, 7 July P. Chang B Factory Results 11

Belle 1 Extraction from B 0 →D 0 h 0 HCP 2005, 7 July P. Chang B Factory Results 12

f(m+2 , m 2 - ) Determination n Using inclusive D*- →D 0 p– Distinguish D from the sign of slow p – Express f in sum of resonances (18) and non-resonant amplitudes – Perform unbinned likelihood fit D 0 → KS p + p HCP 2005, 7 July P. Chang B Factory Results 13

Time dependent Dalitz Analysis Perform fit using 309 ± 31 events with 63% purity Dp 0 (157 ± 24), Dw(67 ± 10), D ( 58 ± 13), D*p 0 /D* (27± 11) More K*+ Than K*Belle Preliminary HCP 2005, 7 July P. Chang B Factory Results 14

Dream of New Physics with CPV in Rare Decays n In the SM for the pure b s transition, sin(2 1)eff (b sss) ≈ sin(2 1)(b ccs) n Any large deviation may mean new physics. n Decay Modes: B KS ; B KKKS; Ks. Ks B f 0 KS, w KS, KSp 0 n Theoretically deviation between the two processes can be as low as ~ 5%. HCP 2005, 7 July P. Chang B Factory Results 15

Results in last summer sin 2 1(bgsqq) = 0. 39 0. 11 (Belle) 0. 42 0. 10 (BABAR) World Average (WA) sin 2 1(bgsqq)= 0. 41 0. 07 sin 2 1(bgccs) = 0. 726 0. 037 CL = 1. 2 10 -4 (3. 8 s) HCP 2005, 7 July P. Chang B Factory Results 16

KS , KL and KKKS Signals 180 16 114± 1 2 536 29 98± 18 78 13 399± 28 New HCP 2005, 7 July P. Chang B Factory Results 17

Fit Results of KS , KL and KKKS HCP 2005, 7 July P. Chang B Factory Results 18

0 0 0 Ba. Bar Measurement on KSKSKS • Allow at most one KS → p 0 p 0. • Find ZCP from the interception of three Ks tracks with IP constrained fit. Nsig= 88 10 • Z resolution is dominated by tagged side vertex. HCP 2005, 7 July P. Chang B Factory Results 19

Belle Measurements on KS and KL 0 Nsig =830 35 0 Nsig =187 18 Belle K 0 : “sin 2 1” = 0. 62 0. 12 0. 04 C = 0. 04 0. 08 0. 06 Ba. Bar K 0 : “sin 2 1” = 0. 30 0. 14 0. 02 C = -0. 21 0. 10 0. 02 HCP 2005, 7 July P. Chang B Factory Results 20

Measurements on KSp 0, w. KS and f 0 KS B 0 KSp 0 Nsig = 344 ± 30 B 0 w. KS Nsig = 68 ± 13 B 0 f 0 KS Nsig = 145 ± 16 Belle update, 386 M BB pairs HCP 2005, 7 July P. Chang B Factory Results 21

Summary of b → s penguin results Need super B factory to provide enough statistics. 2. 6 s deviation HCP 2005, 7 July P. Chang B Factory Results 22

2/ extraction in B → +Loops (penguins) measure eff need to bound | eff- | (shift from loops) different |Penguin/Tree| for different decays HCP 2005, 7 July P. Chang B Factory Results 23

Isospin analysis A+- = A(B→h+ h-) A+0 = A(B→h+ h 0) Gronau and London Why is better? h: p or · pp : Br(B 0 →p 0 p 0) is sizeable. not enough for A 00 and Ã00 too large to set limit on d A 00 = A(B→h 0 h 0) 2| · : | eff - 1. Br( + -) is large. 2. almost fully long. polarized 3. small non-resonant contr. 4. Br( 0 0) is small. Pure tree HCP 2005, 7 July The best way to extract 2 ( ) P. Chang B Factory Results 24

CPV on B 0 → + LP 2005 Paper-180 hep-ex/050349, accepted by PRL B 0 tags Asymmetry Poor tags HCP 2005, 7 July P. Chang Good tags B Factory Results 25

Isospin analysis for B→ New BABAR BELLE f. L S , L C , L B + 0 B 0 0 __ Use the averages of Belle and Ba. Bar and the 0 0 upper limit from Ba. Bar ( - eff < 11 O). / 2 = 96 o ± 13 o HCP 2005, 7 July P. Chang B Factory Results 26

Combine pp, and p HCP 2005, 7 July P. Chang B Factory Results 27

3 /g Extraction in DK Dalitz color favored color suppressed Select D 0 → KSp+ p- m-=m(KSp-) m+=m(KSp+) B+g[KSp+p-]DK+ B-g[KSp+p-]DK- HCP 2005, 7 July P. Chang B Factory Results 28

Distributions of Dalitz Plots HCP 2005, 7 July P. Chang B Factory Results 29

Results of Dalitz Analysis HCP 2005, 7 July P. Chang B Factory Results 30

Putting it together Angles only All constraints No angles HCP 2005, 7 July P. Chang B Factory Results 31

Search for B→tn CKM fit predicts Br(B→tn) = (8. 1 2. 5) x 10 -5 Strategy: 1. Use hadronic tag or semi-leptonic tag 2. 1 or 3 prong topology 3. Check EEcl for the remaining event. HCP 2005, 7 July P. Chang B Factory Results 32

B→K(*) l+l-, Knn n Clean probe for EW scale physics. n Knn measurements: same analysis method as in tn analysis. Belle LP 05 New HCP 2005, 7 July P. Chang B Factory Results 33

B→K(*) l+l. Bar 227 M (NEW) Belle 275 M +0. 075 Br(Kll) = 0. 550 -0. 070 ± 0. 027 Br(Kll) = 0. 34 0. 07 ± 0. 03 +0. 19 Br(K*ll) = 0. 78 -0. 17 0. 12 Br(K*ll) = 1. 65 0. 23 0. 10 Probing new physics on AFB of K*ll. HCP 2005, 7 July P. Chang Stay tuned for EPS B Factory Results 34

Search for B→gg n SM prediction Br(B →gg) ~ 3 x 10 -8 Previous measurement: Ba. Bar with 19. 7 fb-1: Br < 1. 7 x 10 -6 n Belle new measurements with 110 M BB: n Belle: Br <5. 4 x 10 -7 @ 90 C. L. HCP 2005, 7 July P. Chang B Factory Results 35

CPV in B → KSp 0 g LP Paper-97 HCP 2005, 7 July 386 M P. Chang mixing Time dependent CPV is suppressed due to the correlation of photon helicity. Helicity Flip Suppressed by ms/mb Belle-conf-0569 B Factory Results 36

Search for b → d g 1. Exclusive reconstruction 2. Simultaneous fit assuming hep-ex/0408034 HCP 2005, 7 July P. Chang B Factory Results 37

Observation of b → d penguin LP PAPER-155 0. 143 < |Vtd/ Vts| <0. 260 HCP 2005, 7 July P. Chang B Factory Results 38

Another Evidence for b →d penguin Belle 275 M Ba. Bar 227 M KSK+ KS KS Preliminary B→K+K- Ba. Bar (10 -6) <0. 6 B→K 0 K+ 1. 45 B→K 0 K 0 1. 19 HCP 2005, 7 July +0. 53 -0. 46 +0. 40 -0. 35 0. 11 0. 13 P. Chang Belle(10 -6) <0. 37 Preliminary 1. 0 0. 4 0. 1 0. 8 0. 3 0. 1 B Factory Results 39

Confirm Direct CP Violation ACP(K+p- ) = -0. 133 0. 030 0. 009 ACP(K+p- ) = -0. 113 0. 022 0. 008 HCP 2005, 7 July P. Chang B Factory Results 40

Summary of Direct CPV in B→pp 08 WA ACP (K+p-) = -0. 115 0. 018 WA ACP (K+p 0) = +0. 04 ) ~ 3. 9 s deviation, why? ACP sum rule (Gronau and Rosner): D(K 0 p 0) -1/2 D(K+p-) + D(K+ p 0) = Ọ(e 2 ) Iain Stewart 0. 077 0. 070 = Ọ(e 2 ) HCP 2005, 7 July P. Chang B Factory Results 41

New Resonance in e+e-→g. ISR p+p-J/y m = 4260 8 Me. V = 88 23 Me. V Include y(2 S) for cross check Missing mass distribution 211 fb-1 consistent with g HCP 2005, 7 July P. Chang B Factory Results 42

Summary n Precision measurements becomes a reality. – sin 2 1 /sin 2 b = 0. 687 0. 032 from b → ccs calibration o from pp, and p. dominates. – 2/ = (99 +12 ) -9 ( ) – D * K * Dailtz analysis. The best way to extract 3/g. 12 o < 3/g < 137 o (Ba. Bar), 22 o < 3/g < 113 o (Belle) n Deviation of “sin 2 1” from b→s penguin is not settled. Central values move closer; propose super B factory. n Rare decays: sensitive to new physics Observe b→d penguin; confirm Direct CPV; many fine measurements. More results will be shown in EPS! HCP 2005, 7 July P. Chang B Factory Results 44

Backup HCP 2005, 7 July P. Chang B Factory Results

Current CPV results of B→ p+p. Belle 275 M ~2. 3 s difference between Belle and BABAR 227 M HCP 2005, 7 July P. Chang B Factory Results

HCP 2005, 7 July P. Chang B Factory Results