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X. C. Lou, Snowmass 20011 Charm Physics Potentials at B-factories XinChou Lou, University of Texas at Dallas Introduction Physics Topics: branching fractions,

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Presentation on theme: "X. C. Lou, Snowmass 20011 Charm Physics Potentials at B-factories XinChou Lou, University of Texas at Dallas Introduction Physics Topics: branching fractions,"— Presentation transcript:

1 X. C. Lou, Snowmass 20011 Charm Physics Potentials at B-factories XinChou Lou, University of Texas at Dallas Introduction Physics Topics: branching fractions, leptonic decays, mixing Extrapolations from CLEO-B Initial State Radiation Production of Charm Events at B-Factories Measurements with ISR Charm at B-factories Summary

2 X. C. Lou, Snowmass 20012 Introduction BaBar projection 32 fb -1 by end of August 2001 ~400 fb -1 by end of 2004 CLEO-c plan Data-taking in Spring 2003 around charm thresholds, a few fb -1 Physics soon after Super B-factory after 2010? Look at physics of BaBar and CLEO-c in near term Super B-factory longer term

3 X. C. Lou, Snowmass 20013 CLEO-B Extrapolations Leptonic D s decays, f Ds 4.8 fb -1 CLEO, PRD 58,032002(1998) Method current f Ds =(280  29  28  34) MeV (7 stat  10 sys  12 B  )% with 400 fb -1 (<1  (3-6)  2)%  (4-7)% main sys. error: PID, tracking Model Dependent 2.5 fb -1 clns95-1387 current (21.5 stat  13.4 sys )%=24% main sys. errors: random  and eff.  BR with 400 fb -1 (1.7  3)%  3.5% main sys. Error: tracking Model Dependent

4 X. C. Lou, Snowmass 20014 CLEO-B Extrapolations 4.7 fb -1 CLEO, PRD 62,072005(2000) methods:, B-decays, SL/Lifetime current B=(5.0  0.5  0.12)% (10 stat  15  12  8  8  5)% main sys. errors: p tag, modeling, Dp bkg,  c /D spectra,  c /D ID with 400 fb -1 (1.1  (2-5)  2)%  (3-6)% main sys. error: same as above, tracking Model Dependent 1.79 fb -1 CLEO PRL 72, 2328 (1994) continuum data with measured current (3.2  5.4  5.0)%  8.6% main sys. errors: R +, eff., B(D 0  K  ) with 400 fb -1 (2  1.5  1.5)%  3% main errors: R +, eff., B(D 0  K  ) Model Dependent

5 X. C. Lou, Snowmass 20015 CLEO-B Extrapolations Mixing 9 fb -1 CLEO Conf 01-1 Standard Model  10 -8, Beyond SM  10 -(3-4) Method current best limits (5-9)  10 -3 (E791, ALEPH) Sentivity with 400 fb -1 data: for r mix (BaBar Phys. Book) Moder D (  10 -3 ) r W (  10 -3 ) N 0 (  10 6 ) Sensivity (  10 -4 ) KK 7.21.52.61.3 K  2.51.53.10.8 K  0 2.81.55.80.6

6 X. C. Lou, Snowmass 20016 The ISR Method at B-factories M. Benayoun et. al. Spectroscopy at B-factories Using Hard Photon Emission Modern Phys. Lett. A Vol. 14, No. 37, 2605-2614 (1999) form factors, R scan, Upsilon states X. C. Lou and W. Dunwoodie Physics with ISR Events Produced at B-factory Experiments Presented at Hadron 99, Sept, 1999 Nucl. Phys. A675, 253 (2000) charmed hadrons, charmonia, exotics

7 X. C. Lou, Snowmass 20017 Production of Charm near Thresholds via ISR ISR production cross section  ISR =  0 1 f(s,k)  (s´)dk  J. P. Alexander et. al. SLAC-PUB-450 Narrow resonance approximation  (s´) = (3  /s´)  ee  0. (  s´-M R ) 2 +  0 2 /4 Example: e + e -   (2S)  ISR = 13.3  1.1 pb provides a way to determine leptonic width  ee

8 X. C. Lou, Snowmass 20018 Observation of ISR  (2S) signal by B A B AR (8.9 fb -1 ) 208 ±15 events M(  )-M(  ) (GeV) M(  ) (GeV) events  Momentum (GeV)Fitted  Momentum (GeV) DPF 2000

9 X. C. Lou, Snowmass 20019 Estimate of ISR Charm Rates Production interact. (GeV) fraction of sampling fun. cross-section (Coupled-channel model) produced events in 400 fb -1 of data (  1000) (all) 3.94  4.33 0.00167~1 nb~670 (charged + neutral) 4.0  4.6 0.00273~6 nb~6,000 4.57  5.09 0.00284~0.4 nb~450 J/   (2S) ~3.096 ~3.767 ~38 pb ~13 pb 15,200 5,200 Source: J. M. Izen, W. Dundoodie, X. C. Lou, MKIII

10 X. C. Lou, Snowmass 200110 Estimate of ISR Signal Events Decays Produced events in 400 fb -1 of data (  1000) B.R.  Det. Eff. (%) Events reconstructed Relative stat. error (%) Super B-factory ? (%) D s branching fraction ~6700.024163 80.8 D s leptonic decays ~6700.039 260 4.5 (f Ds ) 0.5 ? (f Ds ) D + leptonic decay ~2,8000.00140 161-2 ~2,8000.226,230 ~1.3~0.1-0.2  c branching fraction ~4500.025112~9~1 J/   (2S) leptonic width 15,200 5,200 0.3 0.067 45600 3,500 0.5 1.7 0.05 0.2 Source: J. M. Izen, X. C. Lou

11 X. C. Lou, Snowmass 200111 Charm Cross-sections near Thresholds all D  total  6 nb all D s  total  1 nb all  c  total  0.4 nb MKIII

12 X. C. Lou, Snowmass 200112 Summary Much improved charm measurements with CLEO methods and 400 fb -1 of data around Upsilon(4S) B.R. measurements will be systematics limited New ISR technique brings potentials for B-factory experiments charm physics before CLEO-c turns out physics results continuous e + e - data below Upsilon(4S) over all The ISR approach at a Super B-factory may enable exploration of physics between 10 >  s > 0 GeV at ~10 33 cm -2 s -1

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