B  K   p  and photon spectrum at Belle Heyoung Yang Seoul National University for Belle Collaboration ICHEP2004

H.Y.G.YangICHEP Introduction to b  s(d)   FCNC process forbidden at tree level in SM  sensitive to New Physics  B-factory experiments best experiment to measure FCNC e+e - collider experiment - good background suppresion with high Luminosity

H.Y.G.YangICHEP Results on FCNC at Belle  b  s  First observation of B  K 1  First observation of B  First observation of  p  photon spectrum  b  d  Search for B 

H.Y.G.YangICHEP b  s(d)  analysis tool  Kinematic constraints  E = E * B ― E * beam Mbc= (E * beam ) 2 ― |P * B | 2  Continuum suppression with event shape parameters B flight angle (cos  B ) Fisher discriminant  Particle ID with ACC/TOF/CDC EE Mbc cos  B Fisher

First Observation of B  K 1  with 140/fb

H.Y.G.YangICHEP BK1BK1  Known exclusive 2-body decay of b  s  process B  K*(892)  (K*(892)  K  ) B  K 2 *(1430)  (K 2 *(1430)  K  )  Possible 2-body decays : B  K 1   K 1  axial vectors, mixing states of K 1A & K 1B K 1 (1270) = K 1A cos  + K 1B sin  K 1 (1400) = K 1A cos  – K 1B sin                

H.Y.G.YangICHEP BK1BK1  Theoritical predictions (e.g) S.Veseli and M.G.Olsson PLB 367, 309(1996) B [B  K 1 (1270)  =(1.20  0.44)  B [B  K 1 (1400)  =(0.58  0.26)  H.Y.Cheng and C.K.Chua PRD 69, (2004) sensitive to their mixing angle B [B  K 1 (1270)  =(0.77  0.11)    (or (0.02  0.02)  ) B [B  K 1 (1400)  =(0.08  0.04)  (or (0.80  0.12)  )

H.Y.G.YangICHEP Inclusive B  K   B [B +  K +        by Belle, 29.1/fb PRL 89(2002)  Reanalysis for        / Ks 0      with 140/fb  22 B +  K +      67.4  9 B 0  K 0        B [B +  K +      ] = (2.50  0.18  0.22)   B [B 0  K 0      ] = (2.43  0.36  0.34)   First Observation

H.Y.G.YangICHEP BK1BK1  MK  distribution for the search of K 1 (1270) or K 1 (1400) K 1 (1270)  K  (42%) /  K 1 (1400)  K  (3%)  0.6<M  <0.8GeV K 1 (1270)  K  (16%) /  K 1 (1400)  K  (94%)  0.8<MK  <1.0GeV  2D Unbinned fitting with Mbc  & MK  M bc MK  M bc MK  K 1 (1270) K 1 (1400) Total K 2 *(1430) NR + b2s,K* feed continuum+BBbar K 1 signals 0.6<M  <0.8GeV0.8<MK  <1.0GeV  22 K 1 (1270)22.7  26 K 1 (1400)

H.Y.G.YangICHEP BK1BK1 B [B +  K 1 (1270) +  ] = (4.28  0.94  0.43)   B [B +  K 1 (1400) +  ] < 1.44  10 90% CL 1.3  (1.0<MK  <2.0 GeV ) First Observation

First Observation of B  with 140/fb

H.Y.G.YangICHEP B   K s  can be used for the time-dependent CP asymmetry study  Event reconstruction as  + (Ks 0 )         45.0  11.0 B  K  B [B  K  ] = ( )   First Observation (MK  <2.4 GeV)

H.Y.G.YangICHEP B   MK  distribution for possible resonance  Enhancement around MK  GeV but not significant K 3 *(1780) ? 1.6<MK  <1.95 GeV B [B  K 3 *(1780)  ] < 34  10 90% CL

First Observation of B  p  with 140/fb

H.Y.G.YangICHEP B  p   Radiative baryonic B decay, B  p  / B  p     2D unbinned fitting with  E & M bc 34.1  7 B +  p  Theoretical prediction: Theoretical prediction: * Pole Model * Pole Model : Phys.Lett. B533 (2002) B (B  p Λ  ) ~ 1.2x10 -6 B (B  pΣ 0  ) ~ 2.9x10 -9 *QCD counting rules *QCD counting rules : (hep-ph/ ) B (B  pΛ  ) ~ ( )x10 -7 B (B  pΣ 0  ) ~ ( )x10 -7

H.Y.G.YangICHEP B  p  B [B +  p  ] = (  0.20)   B [B 0  p    ] <3.3  10 90% CL  p  GeV/c 2 for    p  (Mp   4.0 GeV/c 2 for    p    Details will be covered by M.-Z.Wang at next talk. First Observation

Photon spectrum of b  s  with 140/fb

H.Y.G.YangICHEP Photon spectrum of b  s   Full inclusive reconstruction for only E   spectrum  Measure E  of highest mementum photon  veto photons from  0 and   apply event shape cuts to suppress continuum b.g.  cut optimized by using 15/fb off-resonance data  Photon energy spectrum measurements: CLEO : 9/fb, E  > 2.0 GeV Babar : 54/fb, E  > 2.1 GeV new result from Belle : 140/fb, E  > 1.8 GeV

H.Y.G.YangICHEP Photon spectrum of b  s   X s  ] = (3.55  0.32 )  =    GeV - 2 =    GeV 2 Data After subtraction and efficiency correction PRL93,061803(2004)

Search for B  with 253/fb

H.Y.G.YangICHEP Search for B   b  d  suppressed in SM by |V td /V ts | 2  |V td /V ts | 2 by B (B  )/ B (B  K*  )  large direct CP violation is predicted in b  d  Ali and Parkhomenko, Eur.Phys.J. C23 (2002) Bosch and Buchalla, Nucl.Phys. B621 (2002)

H.Y.G.YangICHEP Search for B   Event reconstruction   (     )  /   (     )  /  (       )   with special continuum suppression Fisher & cos  B &  z of B-vertex  LR(Likelihood Ratio) 2D optimization with LR & QR(Quality of flavor tag) LR QR signal continuum

H.Y.G.YangICHEP Search for B  B  K*  suppression by MK  cut   suppression by helicity cut BG signal

H.Y.G.YangICHEP Search for B  with 253/fb  For check of analysis method using B  K*(892)  study B [B  K*(892)  ] = (37.2  1.8)   good agreement with World Average

H.Y.G.YangICHEP Search for B  with 253/fb      Total significance 1.9  Simultaneous unbinned fitting for      assuming their isospin relations

H.Y.G.YangICHEP Search for B  with 253/fb B [B  (  ] < 1.4  B [B +    ] < 2.2  B [B 0    ] < 0.8  B [B  ] < 0.8  B [B  (  ] / B [B  K*  ] =  < |V td /V ts | =0.16  0.05  0.02(th) < 90% CL ( Form factor : Ali (2004) : 0.85  0.10 is used )

H.Y.G.YangICHEP Summary  First observations of B +  K 1 (1270) +  / inclusive B 0  K 0      B     p   Upper limits of B +  K 1 (1400) +  B  K 3 *(1780)  B 0  p    B  / B  |V td /V ts |  Measured photon spectrum of b  s 