sakai 06

Report on HFAG: 

Report on HFAG Y.Sakai (KEK) for HFAG

(General): 

(General) Inherit activities of LEP HF Working group Role provide Averages for Conferences (up-to-date, including preliminary, often) PDG (published results) with 'Consistent manner' (mentioned later) History - discussions at 1st CKM workshop (Feb-2002, CERN) - discussions at FPCP (May-2002, Philadelphia)  new HFAG (for ICHEP02, averages were provided with existing WGs) - Nov-2002: new HFAG started restructuring for Winter conference updates

(General 2): 

(General 2) First averages from new HFAG for 2003 winter conferences Averages for PDG2003 (end March) B lifetimes, Dmd, semi-leptonic Br, sin2b…, rare-decay Br/Acp Web page: please surf http://www.slac.stanford.edu/xorg/hfag/ [ http://belle.kek.jp/mirror/hfag/ (KEK mirror) ] Hope they serve as basis of discussions of WS

Organization: 

Organization Chairs: Daivid Kikby (BaBar) and Yoshi Sakai (Belle) HFAG members: contacts from BaBar,Belle,LEP,CLEO,CDF,D0,PDG Subgroups leader - B-lifetimes/Oscillations: O.Schneider (Belle) - Semi-leptonic (Vcb,Vub): U.Langenegger (BaBar) - Rare-decay Br/Asymmetry: P.Chang (Belle) - UT-angles: A.Hoecker (BaBar) New !

Philosophy: 

Philosophy use common input 'physics parameters' ex) Dmd  B0 lifetime  re-scale each result take into account correlated systematic errors in av. 'physics parameter' uncertainty  sign of systematic error use common method to extract 'physics parameter' ex) semi-leptonic Br  Vcb follow PDG method for established averages (Br etc.) (updated averages) determine the Best Averages

Tools: 

Tools COMBOS (COMBine B OScillation results) - originally developed for oscillation average - c2 fit taking into account statistical uncertainties, correlated/uncorrelated sys. errors - extended to other averages  ex) Vcb try to use for other averages (UT-angles) [also, other utilities/programs are used]

B lifetime/Oscillation: 

B lifetime/Oscillation B lifetime, Oscillation, DG groups: merged B meson/baryon lifetimes: (L.Ciaccio  CDF) B hadron fractions: Oscillation frequency: Dmd , Dms DG : DGs , DGd Inputs to other subgroups Procedures: well established (except DGd ) COMBOS based (specific prog. for b-fracton, DGs) DGd : new measurements available (DELPHI, BaBar) |q/p|, CPTV parameters to be included O.Schneider (Belle) (F.Parodi, C.Weser) (O.Schneider)

B lifetime: 

B lifetime b hadron species average lifetime t/t B0 1.539  0.014 ps B+ 1.656  0.014 ps 1.073  0.014 Bs 1.461  0.057 ps 0.949  0.038 Bc 0.46 ps Lb 1.229  0.080 ps Xb-, Xb0 mixture 1.39 ps b-baryon mixture 1.208  0.051 ps 0.785  0.034 b-hadron mixture 1.573  0.007 ps B0 +0.18 -0.16 +0.34 -0.28 B Hadron Liftimes

Dmd : 

Dmd Dmd 0.502  0.006 ps-1

Dms and DGs: 

Dms and DGs andgt;14.4 ps-1 (95%CL) DGs/Gs andlt;0.54 (95%CL)

Smileptonic: 

Smileptonic Vcb and Vub working groups: merged Determine the best average values: semileptonic B decay branching ratios F(1)|Vcb|, |Vcb|, and |Vub| (Incl/Exclusive) Use a consistent approach (currently): - Consistent approaches in all the experiments based on the latest theoretical etc. developments - Checking consistency of results between the expts, - Evaluating the systematics common to all the expts, - Comparing the results of the different methods Trying to understand their theoretical errors How to control/minimize them [in discussion with theorists] This Workshop ! U.Langenegger(BaBar) V.Luth (BaBar) T.Iijima (Belle) M.Shapiro (CDF) M.Artuso (CLEO) P.Roudeau (DELPHI) E.Barberio (OPAL)

Smileptonic(2): 

Smileptonic(2) Br: Inclusive BX l n, Exclusive B0D*- l n Vcb : Exclusive B0  D*- l n Common inputs, systematics are identified newly f+/f0 included use COMBOS Vcb : Inclusive use GSL [average of LEP and U(4S)] L, L1 : CLEO (bsg spectrum, hadronic mass moment) Vcb = 40.7(1  0.010exp  0.012L’s  0.021/m3)x10-3 -

Br: 

Br Br: Inclusive BX l n Exclusive B0D*- l n

Vcb: exclusive: 

Vcb: exclusive Vcb : Exclusive B0  D*- l n

Vub: 

Vub No average is given (to be discussed at this Workshop) Vub

Rare Decay: 

Rare Decay 1. Preliminary results reported in any conference with written documentation are accepted. 2. Average is performed using the PDG method. 3. The most stringent limit will be used for upper limits. 4. All central values will be used for the averages for decay channels observed by at least one experiment. Method 1. radiative and leptonic B decays: 2. hadronic B decays: 3. baryonic B decays: 4. Acp: Now available: (no decays with cham) http://hep1.phys.ntu.edu.tw/~pchang/rare_hfag.html (to be linked from HFAG web page) P.Chang (Belle) J.Smith (BaBar) J.Alexander (CLEO)

B+ charmless: 

B+ charmless Compilation of B+ Mesonic Branching Fractions Pre-Winter03

B0 charmless: 

B0 charmless Compilation of B0 Mesonic Branching Fractions Pre-Winter03

B+- DCPV: 

B+- DCPV Charmless Hadronic CP Asymmetries B B0

UT-angle: 

UT-angle World averages for measurements related to angles of the Unitarity Triangle (~Time-dep. CPV) g related measurements in future Effective UT angles (e.g., aeff in B0  p+p-): - no attempts are made at this early stage to derive angles if this requires input from QCD. Interpretation of the results will be given at a future stage close collaboration with theorists has to be established Now available: (cc)K0, fKs, h’Ks, K+K-Ks, J/yp0, D*+D*-, D*+D- p+p-, r+p- - This Workshop A.Hoeker (BaBar) M.Shapiro (CDF) H.Evans (D0) J.Smith (BaBar) O.Long (BaBar) Y.Sakai (Belle)

sin2b: 

sin2b Re-scaled to common inputs (updated Dmd, tB) correlated sys. errors use COMBS sin2b(f1)

J/y p0: S, A: 

J/y p0: S, A B0 J/yp0 (= -A)

p;p-: Spp, App: 

p;p-: Spp, App B0  p+p- (2D averages with correlation) (= -A)

p+p-: d vs |P/T|: 

p+p-: d vs |P/T| givn (r,h) measured Spp,Cpp constraint on |P/T|, arg(T/P)had A(B0  p+p-) = Rueig T + RcP (top-loop eliminated using unitarity)

Dependencies: 

Dependencies b fractions B lifetime Dms Dmd Br(bcln),Vcb Br(buln),Vub Time-dep CPV PDG: Br(D etc.) UT-angles DGs Rare-decay Br/CPV

Summary: 

Summary New HFAG is now providing World Averages Hope they serve as basis of discussions Have useful feedback/interactions with experiment/theorists at this Workshop Web page: http://www.slac.stanford.edu/xorg/hfag/ http://belle.kek.jp/mirror/hfag/ (KEK mirror) Please visit to take a look Welcome to use plots etc. for your convenience

current member list: 

current member list Jim Alexander (Cornell, CLEO) Marina Artuso (Syracuse, CLEO) Marco Battaglia (CERN, LEP) Elisabetta Barberio (CERN, LEP) Tom Browder (U.Hawaii, BELLE) Paoti Chang (NTU, BELLE) Hal Evans (Columbia, D0) Lawrence Gibbons (Cornell, CLEO) Andreas Hoecker (LAL-Orsay, BABAR) Toru Iijima (Nagoya, BELLE) David Kirkby (UC Irvine, BABAR) Urs Langenegger (SLAC, BABAR) Yoshi Sakai (KEK, BELLE) Olivier Schneider (U.Lausanne, BELLE) Marjorie Shapiro (LBL, CDF) Jim Smith (Colorado, BABAR) Achille Stocchi (LAL-Orsay, LEP) Weiming Yao (LBNL, PDG)