1 M. Selen, CIPANP/03 Recent Results in Hadronic Charm Decays Mats Selen, University of Illinois 2003 CIPANP, May 19-24, New York, NY.

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Presentation transcript:

1 M. Selen, CIPANP/03 Recent Results in Hadronic Charm Decays Mats Selen, University of Illinois 2003 CIPANP, May 19-24, New York, NY

2 M. Selen, CIPANP/03 I will NOT talk about D s  0 Stay tuned for detailed experimental presentations: BaBar (Ray Cowan) CLEO (Jon Urheim) Belle (Tom Browder) plus a theoretical perspective from Harry Lipkin

3 M. Selen, CIPANP/03 The usual suspects

4 M. Selen, CIPANP/03 Charmed Baryons

5 M. Selen, CIPANP/03 Charm Baryon Lifetimes Thanks to Kevin Stenson for summary figure Phys.Lett.B561:41-48,2003 Phys.Lett.B541: ,2002 Phys.Rev.Lett.88:161801,2002 Phys.Lett.B523:53-59,2001

6 M. Selen, CIPANP/03   c             c           (Steve Blusk) CLEO-III Phys. Rev.D67:012001,2003 First Observation

7 M. Selen, CIPANP/03  0 c  pK  K      0 c  pK  K     (Basit Athar) CLEO-III 148 ± ± 13 pKK  Mass (GeV/c 2 )  Mass (GeV/c 2 ) First branching ratio measurement of this mode. (Made possible by CLEO-III RICH)  0 c  pKK  0c  0c   ** Preliminary **

8 M. Selen, CIPANP/03 c0  +c0  +c0  +c0  + 4291±93 events       K     p   80.5±10.8 events mass scale 456±23 events New  c Mass Measurement previous ** Preliminary **

9 M. Selen, CIPANP/03 c0  +c0  +c0  +c0  + Production cross-section & x p spectrum: From fit to Peterson fragmentation function ** Preliminary **

10 M. Selen, CIPANP/03 Charmed Mesons

11 M. Selen, CIPANP/03 Charm Meson Lifetimes Thanks to Kevin Stenson for summary figure Phys.Lett.B537: ,2002

12 M. Selen, CIPANP/03 Charm potential Trigger important Huge future potential CDF: Huge charm physics potential   Enormous production cross-section   Secondary Vertex Trigger is working well! Reconstructed with online SVT tracks 450,000 events 78,000 events

13 M. Selen, CIPANP/03 Charm potential Trigger important Huge future potential D S + - D + Mass Difference CDF FERMILAB-PUB-03/048-E

14 M. Selen, CIPANP/03 Charm potential Trigger important Huge future potential D 0  K + K ,  +   ** Preliminary **

15 M. Selen, CIPANP/03 D 0  K + K ,  +      3453 ± ± ± 372 hep-ex/

16 M. Selen, CIPANP/03 D +   +  , K +  , K + K s (Chul Gwon) Unbinned maximum likelihood fit using FELIX. Fit variables: M(D + ), x pD, cos  helicity PDF’s obtained from MC & data 171±22 34±21 278±21 DD DD DSDS M(D + ) GeV CLEO-II.V ** Preliminary ** < 90% CL

17 M. Selen, CIPANP/03 CLEO-II.V ** Preliminary ** hep-ex/ Isospin analyses using new D 0  numbers New FOCUS    ,     +  old FOCUS     + PDG New CLEO      + PDG KK 

18 M. Selen, CIPANP/03 D 0                          FOCUS Preliminary PDG2002 ** Preliminary **

19 M. Selen, CIPANP/03 hep-ex/ D +, D S  5-body Decays (Branching Ratios)          1 st obs. FOCUS also has new results on D  6-body decays ! (inclusive ratios) 

20 M. Selen, CIPANP/03 hep-ex/ body Decays (Substructure) NR sum NR      sum                        Consistent with hypothesis that structure dominated by quasi 2-body decays: (30 ± 4 ± 1)% (21 ± 4 ± 6)% (7 ± 5 ± 1)% (40 ± 3 ± 6)% (10 ± 6 ± 5)% (21 ± 5 ± 6)% (75 ± 6 ± 4)% < 90%CL Lipkin: Phys. Let. B 515, 81 (2001) Central value of a 1 mass is outside phase-space, but it’s wide (~400 MeV). (corrected for unseen modes)

21 M. Selen, CIPANP/03 BaBar D 0  K 0 K   +, K 0 K +   and K 0 K + K  ± ± ± ± 48 Normalizing mode A Dalitz analysis was also done for each mode… hep-ex/ Errors are ~ 3-5 times smaller than previous measurements

22 M. Selen, CIPANP/03 D 0  K 0 K   + Dalitz Analysis BaBar hep-ex/

23 M. Selen, CIPANP/03 BaBar D 0  K 0 K +   Dalitz Analysis hep-ex/

24 M. Selen, CIPANP/03 BaBar D 0  K 0 K + K  Dalitz Analysis hep-ex/

25 M. Selen, CIPANP/03 D 0  K s  (Mikhail Dubrovin) CLEO-II.V Motivated by interest in K S     and K S K  K + analyses. K S a 0 (980) seen in K S     but a 0 (980)  is dominant First measurement of this BR ** Preliminary **

26 M. Selen, CIPANP/03 D 0  K s  (Mikhail Dubrovin) CLEO-II.V K S a 0 (980) is dominant K * (892)  is seen Something else needed for good CL (but exactly what hard to sort out): NR, K S a 2 (1320), K S a 0 (1450) , K 0 (1430) , K 1 (1410)  … Under investigation: stay tuned ! ** Preliminary **

27 M. Selen, CIPANP/03 D 0  K s    + (David Asner) CLEO-II.V Fit Fraction (%) (stat err shown)       0.34 ± 0.13       65.7 ± 1.3  26.4 ± 0.9  0.72 ± 0.18   f   4.3 ± 0.5   f   0.27 ± 0.15   f   9.9 ± 1.1        7.3 ± 0.7        1.1 ± 0.2       2.2 ± 0.4 NR0.9 ± 0.4 m 2 (  S   ) (GeV 2 ) m 2 (     ) (GeV 2 ) m 2 (  S   ) (GeV 2 ) m 2 (     ) (GeV 2 ) m 2 (  S  ) RS (GeV 2 ) S/(S+B) ~ 98% S ~ 5300 Phys. Rev. Lett.89:251802,

28 M. Selen, CIPANP/03 BaBar D 0  K S    + BaBar has incredible statistics! Unprecedented sensitivity ! Will the standard approach work ? There are hint of “problems” in many lower statistics Dalitz analyses. Will have to confront these! From Brian Meadows, Moriond/03

29 M. Selen, CIPANP/03 D +        Dalitz m 2  (GeV 2 ) m 2  (GeV 2 ) Fit Frac. (%)     20.8 ± ± 3.2 ± 2.2 f    7.4 ± ± 1.3 ± 0.4 f    6.3 ± ± 2.5 ± 0.4 f    10.7 ± ± 1.5 ± 0.8     22.6 ± ± 0.7 ± 0.3 Non-res38.6± ± 6.0 ± 2.7    46.3 ± 9.0 ± 2.1   138/162 Phys.Rev.Lett.86: ,2001 Phase motion consistent with  : (Method discussed in PLB 550: ,2002)

30 M. Selen, CIPANP/03 D 0    +  0 (Charles Plager) CLEO-II.V m 2 (     ) (GeV 2 ) m 2 (     ) (GeV 2 ) S/(S+B) ~ 80% S ~ 1100 No contribution from  (500) at ~1% level m 2 (     ) (GeV 2 ) m 2 (     ) (GeV 2 ) m 2 (     ) (GeV 2 ) AmplitudePhaseFit Fraction ++ 1 (fixed)0 (fixed)76.5±1.8±4.8 00 0.56±0.02±0.0710±3±323.9±1.8±4.6  0.65±0.03±0.04  4±3±4 32.3±2.1±2.2 NR1.03±0.17±0.3177±8±112.7±0.9±1.7 ** Preliminary **

31 M. Selen, CIPANP/03 D +         Dalitz Phys.Rev.Lett.89:121801,2002 Fit Frac. (%)     13.8 ± ± 1.0 ± 0.9 K  *    30.6 ± ± 1.4 ± 0.5 K  *    0.4 ± ± 0.1 ± 0.2 K *    3.2 ± ± 0.7 ± 0.3 Non-res90.9± ± 5.8 ± 4.4    47.8 ± 12.1 ± 5.3   46/ m 2  (GeV 2 ) m 2  (GeV 2 ) CLEO Dalitz analysis of D 0       0 sees no evidence for . Phys. Rev.D63:092001,2001

32 M. Selen, CIPANP/03 D +              Dalitz Stay Tuned New results expected later this year

33 M. Selen, CIPANP/03 BES  &  from J/  decays Preliminary BES results indicate significant contribution from  and  in J/   and J/     respectively Ning Wu (IHEP, Beijing) from talk given at “Hadron Spectroscopy….” Tokyo, Feb/03

34 M. Selen, CIPANP/03 D 0  K s    0 (Scott Davis) (Just a peek…stay tuned) CLEO-II.V+III Complement K S     analyses Good place to search for low mass  No   0  0 to get in the way! Fit seems to prefer presence of a broad scalar  resonance (?) No unique solution using BW’s. Also trying K-matrix approach. S/(S+B) ~ 70% S ~ 700 m 2 (     ) (GeV 2 ) m 2 (  S   ) RS (GeV 2 ) m 2 (     ) (GeV 2 ) K * (890) + K 0 (1430) + f 0 + NR m 2 (     ) (GeV 2 ) K * (890) + K 0 (1430) + f 0 + NR +  Not the only way to get a good fit… more work needed

35 M. Selen, CIPANP/03 D 0  K  K +  0 (Paras Naik) (Just a peek…stay tuned) CLEO-III Made possible by CLEO-III RICH Motivated by method for measuring “  ” using B ± → D 0 K; D 0 →K * K [Grossman, Ligeti, Sopher & others] Ingredient: Strong phase between D 0 →     and D 0 →      Exactly what this analysis measures  Stay Tuned S/(S+B) ~ 55% S ~ 400 m 2 (     ) (GeV 2 ) m 2 (     ) (GeV 2 ) m 2 (     ) (GeV 2 )

36 M. Selen, CIPANP/03CLEO-c Summing Up There are many more on the way. The next few years should be very exciting for those of us interested in charm physics! Too many new charm results to do them all justice in 30 minutes !! D**  c etc.