report on hfag

CKM WS 2003 at Durham 1

Report on HFAG

Y.Sakai (KEK) for HFAG


(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)

• First averages from new HFAG for 2003 winter conferences• Averages for PDG2003 (end March)

B lifetimes, md, semi-leptonic Br, sin2…, 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 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 use common input 'physics parameters' ex) md 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

• COMBOS (COMBine B OScillation results) - originally developed for oscillation average

- 2 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, groups: merged

B meson/baryon lifetimes: (L.Ciaccio CDF) B hadron fractions: Oscillation frequency: md , ms

: s , d

Inputs to other subgroupsProcedures: well established (except d ) COMBOS based (specific prog. for b-fracton, s)

d : new measurements available (DELPHI, BaBar)|q/p|, CPTV parameters to be included

O.Schneider (Belle)

(F.Parodi, C.Weser)

(O.Schneider)


B lifetime

b hadron species average lifetime 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 b 1.229 0.080 ps

b, b

0 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

+0.180.16

+0.340.28

B Hadron Liftimes


md md 0.502 0.006 ps-1


ms and s

>14.4 ps-1

(95%CL)

s/s<0.54 (95%CL)


SmileptonicVcb 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)Br: Inclusive BX l Exclusive B0D*- l Vcb : Exclusive B0 D*- l

Common inputs, systematics are identified newly f+/f0 included

use COMBOS

Vcb : Inclusive use SL [average of LEP and (4S)] : CLEO (bs spectrum, hadronic mass moment)

Vcb = 40.7(1 0.010exp 0.012’s 0.021/m3)x10-3


BrBr: Inclusive BX l Exclusive B0D*- l


Vcb: exclusiveVcb : Exclusive B0 D*- l


Vub

No average is given

(to be discussed at this Workshop)

Vub


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

Compilationof

B+ MesonicBranchingFractions

Pre-Winter03


B0 charmless

Compilationof

B0 MesonicBranchingFractions

Pre-Winter03


B+- DCPV Charmless Hadronic CP Asymmetries

Pre-Winter03

B

B0


UT-angle World averages for measurements related to angles of the Unitarity Triangle (~Time-dep. CPV) related measurements in future

Effective UT angles (e.g., eff in B0 +-): - 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, Ks, ’Ks, K+K-Ks, J/0, D*+D*-, D*+D-

+-, +-

-This Workshop

A.Hoeker (BaBar) M.Shapiro (CDF) H.Evans (D0) J.Smith (BaBar) O.Long (BaBar) Y.Sakai (Belle)


sin2b

• Re-scaled to common inputs (updated md,B)

• correlated sys. errors

• use COMBS

sin2


J/y p0: S, AB0 J/0

(= A)


p;p-: Spp, AppB0 + (2D averages with correlation)

(= A)


p+p-: d vs |P/T|

givn ()measured S,C

constraint on|P/T|, arg(T/P)had

A(B0 +-) = Rue

i T + RcP

(top-loop eliminated using unitarity)


Dependencies

b fractions B lifetime

ms md

Br(bcl),Vcb

Br(bul),Vub

Time-dep CPVPDG: Br(D etc.)

UT-angles

s

Rare-decay Br/CPV


SummaryNew 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• 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)

report on hfag

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