G. Eigen U Bergen NFR Meeting Bergen October 19, 2005
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1 G. Eigen U Bergen NFR Meeting Bergen October 19, 2005
2 Introduction The BABAR experiment was designed to measure sin 2 2 with high precision in the mode B J/ K 0 S For sin 2 2 no high precision results were expected & measurement of was considered to accomplished by LHCb & BTEV Collaboration formed Dec 1993 & TDR was completed March 1995 First hadronic event in BABAR was seen May 26, 1999 Design luminosity of L= cm -2 s -1 was reached Sep 14, 1999 L= cm -2 s -1 was achieved October 9, 2005 Presently, an integrated luminosity of ~300 fb -1 is recorded BABAR is expected to run till end of 2008 accumulating integrated luminosity of 1000 fb -1 BABAR has published 140 papers (88( in PRL, 51 in PRD, 1 NIM) Another 25 papers have been submitted to PRL & PRD 2
3 PEP II Performance design Peak luminosity: L= cm -2 s -1 best day: L=0.73fb -1 /d Total integrated luminosity in BABAR: L tot = 299 fb -1 3
4 V CMK Matrix ud V us V ub V CKM = V cd V cs V cb Unitarity V ud V * ub +V cd V * cb +V td V * tb = 0 V td V ts V tb BABAR measures 4 CKM elements & 3 phases overconstrains unitarity triangle test Standard Model B(B X u l ) a CP (B (B + - ) m d, V ud V * ub V cd V * cb V td V * tb V cd V * cb a CP (B J/ J/ K S ) B(B X c l ) 1 B(B DK) 4
5 Measurements of sin 2 2 sin 2 from B (cc) K s (K L ) modes for BB pairs cck S sin 2 results for b ccs penguin & b ccs charmonium modes sin ±0.03 sin2 = ± 0.040± ±0.06 New Belle result: sin2 = ± 0.039± discrepancy between b ccs & b sss modes 5
6 Measurement of sin 2 2 Measure B modes to extract sin 2 2 ( BB pairs) Observe 2 lucky incidents: Polarization ~100% logitudinal pure CP-even state Small B(B 0 0 )< yields eff CP asymmetry in B + - < 90% CL S long ( ) = 0.33 ± C long ( + ) = 0.03 ± 0.18 ± 0.09 B 0 -tags B 0 -tags BABARAR Other B branching fractions B(B + B(B ) = ( ± 5.8) ) = (33 ± 4 ± 5) 10 6 From isospin analysis get = [100 ± 7 exp ± 11 peng ] o 6
7 Summary on From combined,, results constrain to: = [ ] o Mirror solutions are disfavored CKM indirect constraint yields: = [ ] o Very good agreement 7
8 Dalitz Plot Analysis for CP results from interference of color-allowed b cus & color- suppressed b ucs b ucs decays new idea: increase interference through D decay Dalitz plot (*)0 0 B D KS K From combined analysis From indirect constraints = [51-18 = [57-13 ] o 8
9 Status of Unitarity Triangle Allowed region is determined from UT sides & sin 2 2 Both angles,, & UT sides are in good agreement Allowed UT region agrees with SM prediction Look for New Physics as correction to SM Bergen is involved in CKM fits 9
10 FB Study of Radiative Penguin Decay B XB s + - This rare decay is rather sensitive to New Physics contributions in the loop SM may modify SM Wilson coefficients C 7, C 9, C 10 BABAR measured B & db/dm ll B(B X s + ) = (5.6 ± 1.5 stat ± 0.6 sys ± 1.1 mod ) 10 6 NP This is consistent with SM prediction (large errors) Next step is to improve B & to measure lepton forward- backward asymmetry A l FB with 500 fb -1 Bergen is involved here 81.9 fb -1 A l FB 10
11 Observation of New States In ISR events see Y(4260) J/ J/ Events / 20 MeV/c J/ψ sidebands (2S) m( π + π - J/ ψ) (GeV/c 2 ) LP fb ±23 events significance >8 M=(4258±8) MeV just above D + S D- S threshold Total width =(88±23) MeV Joins list of not classified states BABAR discovered D sj (2317) state & confirmed D sj (2460) (CLEO) BABAR confirms (3870) discovered by Belle BABAR & Belle do not observe pentaquark states 11
12 Manpower in BABAR during Project Period Physicists: G. Eigen (PI), B. Stugu Postdocs: P.L. Reinertsen (50%, Sep 99-Jul 00) Graduate Students: I. Ofte, L. Sun Master students: K. Søyland (6/00), I. Ofte (01/01), L.T. Skiftesvik (01/01), R. Andreassen (12/03), R. Hansen (12/04), K. Follesø Other contributions: V. Schmitt, A. Inki, M. Niska Project students: H.Gjersdal, H. Skerdal Persons shown in red are presently involved in BABAR 12
13 BABAR Activities during Project Period Aging tests of optical fibers for light pulser (Schmitt, Stugu) Production of 60 mounting tools for light pulser installation (GE) Contribution to online software (Inki) Work on calorimeter interface to objectivity database (Niska) Contribution to cosmic run commissioning (GE) Study of error matrix for photon showers (GE, Skiftesvik, Reinertsen) Monitoring and quality checking of BABAR EMC (Ofte, Reinertsen, Stugu) BABAR shifts (Andreassen, GE, Hansen, Ofte, Stugu, Skiftesvik,) Member of speaker s bureau since Oct Jun 2001 (GE) Radiative Penguin AWG Co-convenor Dec Jul 2002 (GE) Review work in several paper committees (GE) 13
14 Other Activities during Project Period (GE) Referee for PRL (B, & charm physics) since 2001 Referee for NIM since 2002 Referee for the PDG (CKM) since 2002 Co-convener for rare decays in indirect SUSY searches, Snowmass 01 Co-convener for rare decays at EPS conference 2003 Convener of world-wide calorimeter day for ILC detector Nov 2003 Invitation to the Swedish particle physics day as the external speaker, Lund 2001 Invitation to the Finnish particle physics day as the external speaker, Jyväskylä 2005 External Reviewer of T. Colberg s thesis, Dresden 2002 Part of Førskerskole Smart Detectors (BABAR) since October 2004 Member of EUDET network (EU) since October
15 Analyses during Project Period Master theses: Study of B 0 J/ K 0 S in simulations (K. Søyland) Study of B J/ (K + or K 0 S ) & B (2S) (K + or K 0 S ) (I. Ofte) Study of B 0 J/ K *0 and B (2S)K *0 (L.T. Skiftesvik) Study of B 0 K ± - ; + explore high-k mass region (R. Andreassen) Study of B 0 J/ K ± - ; + explore high-k mass region (R. Hansen) Study of B ± J/ K ± - +, measure branching fraction (K. Follesø) PhD theses: Search for exclusive B + - (I. Ofte) Study of B X s + - with semi-inclusive X s reconstruction (L. Sun) Other Studies (GE): Time-dependent CP asymmetry in B 0 D 0 K 0 S measurement Determination of CKM parameters from global fits in - plane Determination of Wilson coefficients to fits of radiative decays Names in red: ongoing work 15
16 Exclusive B J/ B J/ K ± - Decays + Select events in m ES - E signal region & fit background subtracted spectrum with K * (892), K * 2 (1430) & K S-wave (LASS paramet.) K * (892) Spectrum is well-described by these 3 components K * 2 (1430) Similar result is obtained in μ + μ - mode B(B J/ J/ K * (892))=(1.24±0.02±0.09) B(B J/ J/ K * 2(1430))=(2.5±0.4±0.3) (1430))=(2.5±0.4±0.3) (R. Hansen, GE) 16
17 Analysis of B K B Modes We studied mass spectrum in the exclusive radiative decay B K performing a 4-dimensional fit of m ES, E, m K, & cos H K * (892) 113 fb -1 cos H D background K * 2 (1430) In K * 2(1430) mass region Results for K * are in good agreement with BABAR publication For K * 2 (1430) measure branching fraction & CP asymmetry: B(B K * 2 (1430))=(2.8±0.3±0.4) (1430))=(2.8±0.3±0.4) A CP (B K * 2 (1430))=(1.5±19.2)% (R. Andreassen,, GE) 17
18 Conclusion & Outlook BABAR has been very successful exceeding design plans by far sin 2 is measured with 6% precision in charmonium modes sin 2 is measured in penguin modes with 2.4 deviation Angle is measured with 10% precision is measured with a precision of +23 o -18 o Radiative penguin decays are observed New states are discovered The small Bergen group has and still is contributing to physics decays with charmonium, radiative penguin decays, CP violation In fact, a lot of BABAR work has propagated into ATLAS (e.g. MC generators, tools, physics expertise, ) We would like to continue BABAR to finish our present analyses, so students can earn their degrees & we get publications & we can develop further sophisticated tools & test with data before trying them in ATLAS analyses (Preparation for LHC) 18
19 B 0 J/ K 0 S Flavor tag: b ce e e - 0 K S J / e + 19
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