B decays to open charm and charmonium from BaBar Stefania Ricciardi Royal Holloway, University of London On behalf of the BaBar Collaboration 32nd International Conference on High Energy Physics Beijing, August 16-22nd,2004

Stefania Ricciardi, BaBar Outline Testing models of hadronic B decays Inclusive charm production in B decays B0  Ds*+ D*- [and Ds  f p+] B0  D(*)-pp+, B0  D(*) 0pp Exclusive B  (cc) K(*), where cc = J/y,y(2S),cc Charm and Charmonium Spectroscopy: B decays to DsJ (2317) and DsJ (2460) X(3872) For new results on B D(*)K(*) and B Ds+r - see L.Cavoto’s talk in the CP violation session All results are PRELIMINARY Fully hadronic decays of B mesons provide an effective laboratory to test heavy quark theories and study dynamics of strong interactions in heavy meson systems Stefania Ricciardi, BaBar ICHEP04

Stefania Ricciardi, BaBar Inclusive charm Hadronization models (Heavy Quark Expansion) predict average charm multiplicity in B decays, nc  1.2-1.3 [Bagan et al. PLB351(1995) Buchalla and Dunietz, PLB364(1995) Neubert and Sachrajda, Nucl.Phys.B483(1997)] b c u W - B- s’ We define: Flavor correlated charm production from dominant bc transition Flavor anti-correlated charm production from W-  cs’ decay The dominant process for the decay of a b quark is a b->c transition , resulting in a flavor correlated c quark and a W. The decay of a W in cs or cd pair will produce anti-correlated charm [charge-conjugation implied everywhere] Stefania Ricciardi, BaBar ICHEP04

Inclusive charm: a new experimental method Full reconstruction of one B = Breco Charm hadron searched for in rest of event, fully reconstructed and correlated with charge of parent B = Brecoil We correct for: mixing in the B0 sample and background from B0 (B+) in the B+ (B0) sample K D0 Breco Y(4S) B B : p B+ (#) Y(4S) p, r,a1 e- e+ D+, D0, Ds,Lc B-   X Brecoil (# at the time of Breco decay only, for neutral B) Stefania Ricciardi, BaBar ICHEP04

Stefania Ricciardi, BaBar BaBar Preliminary Inclusive charm D0 D0 Signal 127342 Signal 16016 Data sample: 89 million B pairs D+ Blue-shaded areas: true charm particles from background of misreconstructed B Signal 26229 Signal 9820 D- B- anti-correlated D+S Signal 115 D-S Signal 8211 B- correlated Significant production of correlated D0 and D+ Ds correlated production small. Anti-correlated dominant. L+c Signal 419 L-c Signal 339 Stefania Ricciardi, BaBar ICHEP04

Inclusive charm: branching fraction correlated anti-correlated Xc B(B- XcX) % D0 79.3 ± 2.5 ± 4.0+2.0-1.9 9.8 ± 0.9 ± 0.5+0.3-0.3 D+ 9.8 ± 1.2 ± 1.2+0.8-0.7 3.8 ± 0.9 ± 0.4+0.3-0.3 D+s 0.5 ± 0.6 ± 0.2+0.2-0.1 <2.2 at 90% CL 14.3 ± 1.6 ± 1.5+4.9-3.0 L+c 3.5 ± 0.8 ± 0.3+1.3-0.8 2.9 ± 0.8 ± 0.3+1.1-0.6 B- recoil N(B+RECO) = 85840 ± 1910 correlated anti-correlated Xc B(B- XcX) % D0 51.1 ± 3.1 ± 2.5+1.3-1.3 6.3 ± 1.9 ± 0.5+0.2-0.2 D+ 39.7 ± 3.0 ± 2.8+2.8-2.5 2.3 ± 1.8 ± 0.3+0.2-0.2 < 5.1 at 90% CL D+s 3.9 ± 1.7 ± 0.4+1.3-0.8 < 8.7 at 90% CL 10.9 ± 2.1 ± 0.8+3.8-2.3 L+c 4.9 ± 1.7 ± 0.4+1.8-1.0 2.0 ± 1.2 ± 0.2+0.7-0.4 <3.9 at 90%CL B0 recoil N(B0RECO) = 48322 ± 590 First measurement of D+s correlated Sizeable Lc production Stefania Ricciardi, BaBar ICHEP04

Inclusive charm: nc0, nc- We find no evidence of B- Lc+ Lc- K looking at the missing mass distribution (obtained from the B 4-momentum, a K and a reconstructed Lc or Lc) We estimate B(B- c X) = B(B- Lc- X) - B(B- Lc+ Lc- K)  B(B- Lc- X) B(B- c X) neglected Using B(B- (cc) X) = (2.3 ± 0.3) %, we determine separately for the first time: B- B0 Previous results (hep-ex/0112028) 1.175 ± 0.042 (CLEO) 1.230 ± 0.042 (LEP+SLD) 1.206 ± 0.033 (Average) Stefania Ricciardi, BaBar ICHEP04

Stefania Ricciardi, BaBar B0  Ds*+ D*- New measurement of B(B0  Ds*+ D*-) Experimental test of factorization at high q2 values: q2~m2(Ds*+) New measurement of B(Ds+ f p+) used to normalize other Ds+ branching fractions The present ~25% uncertainty B (Ds+f p+ ) = (3.6 ± 0.9)% (CLEO) propagates to all analyses where a Ds(*) is reconstructed Stefania Ricciardi, BaBar ICHEP04

Stefania Ricciardi, BaBar B0  Ds*+ D*-: method With a partial reconstruction technique, determine B1 = B (B0  Ds*+ D*-) Fully reconstruct final state with Ds+ f p+ and measure B2 = B (B0  Ds*+ D*-) x B (Ds+ f p+) B (Ds+ f p+) = B2/B1. Many systematics cancel in the ratio. Stefania Ricciardi, BaBar ICHEP04

B0  Ds*+ D*- : partial reconstruction hep-ex/0408040 124 million B pairs Ds+ from Ds*+  Ds+ is not reconstructed Pair D*- ( D0 p-) and  , assuming they come from B0 Ds*+D*- This BaBar Result independent of B(Ds+ fp+) : Signal: 7414 ± 345 B(B0 Ds*+D*-) = (1.85 ± 0.09(stat) ± 0.16(syst) )% in agreement with previous: and theory (Luo and Rosner,2001): We compute the missing mass recoiling against the D* - gamma system in the center of mass The distribution of signal events peak at the nomial D-S mass with a spread of about 15MeV    B(B0 Ds*+D*-) = (1.9 ± 0.5)% (PDG2004) B(B0 Ds*+D*-) theor= (2.4 ± 0.7)% Stefania Ricciardi, BaBar ICHEP04

Stefania Ricciardi, BaBar Ds+ f p+ :Results D* and g selection analogous to inclusive analysis Ds+ f (K+K-) p+ fully reconstructed measure branching fraction product: B (B0  Ds*+ D*-) x B (Ds+ f p+) = (8.71  0.78(stat)) x10-4 Dividing by our measurement of B(B0 Ds*+D*-), we obtain B(Ds+ f p+) = (4.71 ± 0.47(stat) ±0.35(syst))% to be compared with Signal 212 ±19 B(Ds+ f p+) = (3.6 ± 0.9)% (CLEO) Readjustment of many results needed! Not used yet for other results in this talk Stefania Ricciardi, BaBar ICHEP04

B0D(*)-pp+ and B0 D(*)0pp hep-ex/0408035 124 millions B pairs B0D(*)-pp+ and B0 D(*)0pp Full reconstruction Explore dynamics of decays involving baryons Multi-body decays to baryons sizeable, as found by CLEO & predicted B0D*-pp+ 130 ± 14 B0D-pp+ 238 ± 22 I.Dunitez, PRD (1998) Hou and Soni, PRL (2001) Chua, Hou and Tsai, PRD (2002) B0D*0pp 13 ± 4 B0D0pp 96 ± 11 No evidence of q0c+ @ 3.1 GeV Sizeable means few times lower than D*pi, Drho Dunietz predicts total baryon production and subtracts charmed baryon production to determine B->D*NN X where N is a nucleon (prediction = few %) Chua et al use a factorization approach of current produced nucleon pairs (baryon weak current form factors related by isospn rotation to nucleon em form factors (account of 60% of observed rate, rest from axial currents). B0D*-pp+ Decay B (10-4) Reference B (10-4) B0D*-pp+ 5.61 ± 0.59 ± 0.73 6.5+1. 3-1.2 ± 1.0 (CLEO) B0D-pp+ 3.80 ± 0.35 ± 0.46 - B0D*0pp 0.67 ± 0.21 ± 0.09 1.20+0.33-0.29 ± 0.21 (Belle) B0D0pp 1.24 ± 0.14 ± 0.12 1.18 ± 0.15 ± 0.16 (Belle) Stefania Ricciardi, BaBar ICHEP04

Stefania Ricciardi, BaBar B  (cc) K(*) Exploring heavy quark dynamics by measurements of exclusive B decay rates to modes allowed in the factorization scheme (charmonium JPC=1-- or 1++) [12 decay modes]: B  J/y K(*) B  y(2S) K(*) B  cc1 K(*) and suppressed ( measure size of non-factorizable contributions) (JPC=0++ or 2++) [8 decay modes]: B  cc0 K(*) B  cc2 K(*) Measurement of CP asymmetries in the charged modes to search for effects due to “New Physics” [Diehl and Hiller, JHEP 0106 (2001)] Charmonium reconstructed in J/y(y(2S))  l+l- cc J/y Stefania Ricciardi, BaBar ICHEP04

B (B  (cc) K(*)) Results hep-ex/0408036 124 million B pairs Channel BR (10-4) PDG2004 B+  J/y K+ 10.55  0.15  0.48 10.0  0.4 B+  cc1 K*+ B0  J/y K0 8.73  0.23  0.30 8.5  0.5 B+  J/y K*+ 14.34  0.36  0.94 13.5  1.0 B0  J/ y K*0 12.92  0.25  0.75 13.1  0.7 B+  y (2S) K+ 6.31  0.33  0.44 6.8  0.4 B0  y(2S) K0 6.60  0.60  0.46 6.2  0.7 B0  cc1 K*0 B+  y (2S) K*+ 6.03  0.85  0.91 9.2  2.2 B0  y (2S) K*0 6.65  0.57  1.00 8.0  1.3 B+  cc1 K+ 5.72  0.24  0.64 6.8  1.2 B0  cc1 K0 4.56  0.39  0.51 4.0 +1.2 -1.0 B+  cc1 K*+ 2.89  0.69  0.93 new B0  cc1 K*0 3.19  0.37  0.64 4.1  1.5 Stefania Ricciardi, BaBar ICHEP04

B  (cc) K(*): Other Results Charged/Neutral Ratio assuming equal production of charged and neutral at Y(4S) (i.e., R+/0 =1) R+/0 (assuming isospin invariance and tB+/ tB0=1.086 ± 0.017 from PDG2004) Final state Asymmetry J/y K+ -0.029 ± 0.014 ± 0.010 J/y K*+ 0.045 ± 0.025 ± 0.011 y(2S)K+ 0.059 ± 0.051± 0.021 y(2S)K*+ -0.063 ± 0.137 ± 0.050 cc1 K+ 0.011 ± 0.042 ± 0.017 cc1 K*+ -0.403 ± 0.309 ± 0.237 Charge CP Asymmetries All measurements compatible with no direct CP asymmetry. Stefania Ricciardi, BaBar ICHEP04

Factorization suppressed decays hep-ex/0408033 124 million B pairs B+  cc0 ( pp,KK) K+ observed by Belle and BaBar with B.F. >10-4, i.e., comparable to factorization allowed decays Radiative BF relatively large for cc2: B (cc0  J/y g) = (1.18 ± 0.14)% B (cc1  J/y g) = (31.6 ± 3.3)% B (cc2  J/y g) = (20.2 ± 1.7)% cc2 BF (10-4) (90% CL) K+ <0.36 K0 <0.44 K*+ <0.14 K*0 <0.22 m(llg) – m(ll) cc1 cc1 cc2 cc2 cc0 cc0 Upper limits for B  cc2 K(*) an order of magnitude smaller than B.F. for factorization allowed modes and B  cc0 K(*) No statistical significant signal Stefania Ricciardi, BaBar ICHEP04

B Mesons Heavenly Gateways to Forbidden States… Spectroscopy B Mesons Heavenly Gateways to Forbidden States… B mesons are a privilege gateway to study the nature of newly discovered puzzling particles and search for new levels in the charm and charmonium spectra.

Study of B  DsJ(*)+D(*) DsJ*(2317)+, DsJ (2460)+ Observed by BaBar, Belle and CLEO Unexpectedly below threshold for DK and D*K, respectively Consistent with P-wave cs states but other interpretations not ruled out If cs, observed decays DsJ*(2317)+  Ds+ p0 DsJ (2460)+  Ds*+ p0 are isospin violating  narrow DsJ (2460)+  Ds+ g also observed (and used here to determine J) DsJ (2573)+ Ds1(2536)+ Ds1(2460) Ds0(2317) Ds*+ Ds+ Godfrey-Isgur model S-wave P-wave Stefania Ricciardi, BaBar ICHEP04

Stefania Ricciardi, BaBar B  DsJ (*)+ D(*) hep-ex/0408041 Data sample: 122 million B pairs mES m(DsJ) Signal: 88 ± 17 events DsJ*(2317)+  Dsp0 Full reconstruction of the exclusive B decay Sum over all D(*)(0) modes DsJ(2460)+  Ds*p0 112 ± 14 events We measure: DsJ(2460)+  Dsg 139 ± 17events Stefania Ricciardi, BaBar ICHEP04

Stefania Ricciardi, BaBar B  DsJ (*)+D* Results First measurement of all these modes m(Ds+p0) m(Ds*+p0) m(Dsg ) B.F. (10-3) DsJ*(2317)+  Dsp0 DsJ(2460)+ Ds*p0 DsJ(2460)+ Dsg B0 1.5 ± 0.4 ± 0.2(+0.5-0.3) 5.5 ± 1.2 ± 1.0(+1.9-1.2) 2.3 ± 0.3 ± 0.3(+0.8-0.5) B+ 0.9 ± 0.6 ± 0.2(+0.3-0.2) 7.6 ± 1.7 ± 1.8(+2.6-1.6) 1.4 ± 0.4 ± 0.3(+0.5-0.3) B.F. Products for BDsJ(*)+D* Stefania Ricciardi, BaBar ICHEP04

Stefania Ricciardi, BaBar B  DsJ (*)+D Results m(Ds+p0) m(Ds*+p0) m(Dsg ) B.F. (10-3) DsJ*(2317)+  Dsp0 DsJ(2460)+ Ds*p0 DsJ(2460)+ Dsg B0 1.8 ± 0.4 ± 0.3(+0.6-0.4) 2.8 ± 0.8 ± 0.5(+1.0-0.6) 0.8 ± 0.2 ± 0.1(+0.3-0.2) B+ 1.0 ± 0.3 ± 0.1(+0.4-0.2) 2.7 ± 0.7 ± 0.5(+0.9-0.6) 0.6 ± 0.2 ± 0.1(+0.2-0.1) B.F. Products for BDsJ(*)+D in good agreement with Belle results Stefania Ricciardi, BaBar ICHEP04

Stefania Ricciardi, BaBar BDsJ(2460)+D : Helicity J=2 DsJ+ (2460) Ds g qh J=1 Data points from m(Dsg) fits corrected for detector acceptance and efficiency J=1 (c2=4.0/4) preferred to J=2 (c2=36.4/4) confirms Belle measurement Stefania Ricciardi, BaBar ICHEP04

X(3872) from B-J/y K-p+p- m(J/yp+p-) hep-ex/0406022 117 million B pairs Discovered by Belle(2003) in B decays Confirmed by CDF,D0 and BaBar as narrow state decaying to J/y p+ p- Nature unknown (Charmonium, DD* molecule, ccg hybrid?) Most puzzling: mass @ D0D*0 threshold m(J/yp+p-) y(2S) 30.5 ± 5.8 signal events , after bkg (combinatorial and peaking) subtraction, in 20 MeV: 3.862 < mX <3.882 GeV X(3872) X(3872) y(2S) mX(3782)= 3873.4 ±1.4 MeV/c2 B(B-X(3872)K-) x B(X(3872)J/yp+p-) = (1.28 ± 0.41) x10-5 m(p+p-) Accumulation near kinematic limit in m(p+p-) which is ~m(r0) for X(3872). Isospin-breaking ? More data needed! Stefania Ricciardi, BaBar ICHEP04

Stefania Ricciardi, BaBar Search for B X -(3872) K Data sample: 213 million B pairs m(J/yp-p0) If observed decay is X(3872)J/yr0  charged partner may exist X(3872) - J/yr- Search for B0  X-K+, B-  X-K0s (and charged conjugates) with X-  J/y p-p0 If X isovector, decay rate to X should be twice that observed for neutral X [BaBar: (1.28 ± 0.41) x10-5] B0 X-? Mode B0  J/y p-p0K+ B- J/y p-p0K0s n obs. 87 31 n bkg. 101.8 ± 10.2 27.6 ± 6.2 n signal -14.8 ± 13.9 3.4 ± 8.3 90%CL < 5.8 x 10-6 < 11 x 10-6 Consistent with peaking background (estimated from mX sidebands) B0 A likelihood ratio test excludes isovector hypothesis (Probability <1/600) mES for |m(X)-3872| < 12MeV Stefania Ricciardi, BaBar ICHEP04

Stefania Ricciardi, BaBar Summary New results on B decays to open and hidden charm from BaBar: Powerful application of recoil method for first separate determination of nc- and nc0 Most precise measurement of B0  Ds*+ D*- and Ds branching fractions Improved measurements of B0  D(*)-pp+, B0  D(*) 0pp Improved results of many exclusive B decays to charmonium, including: measurement of B+  cc1 K*+ stringent upper limits on B  cc2 K(*) First observation of B DsJ(*)+D* New insights on X(3872): isovector hypothesis excluded B(Ds+ f p+) = (4.71 ± 0.47(stat) ± 0.35(syst))% Stefania Ricciardi, BaBar ICHEP04

Additional Slides

Stefania Ricciardi, BaBar Ds+ f p+ Data sample 124 million B pairs 1 - Partial reconstruction: Signal 7414 ± 345 Partial reconstruction result independent of B(Ds+ fp+):    B(B0 Ds*+D*-)=(1.85 ± 0.09(stat) ± 0.16(syst) )% 2 - Full reconstruction: B (B0  Ds* D*-, Ds f p+) = (8.71  0.78(stat)) x10-4 From the ratio BaBar obtains: Signal 212 ±19 B(Ds+ f p+) = (4.71 ± 0.47(stat) ±0.35(syst))% B(Ds+ f p+) = (3.6 ± 0.9)% PDG2004 (CLEO) Stefania Ricciardi, BaBar ICHEP04

Stefania Ricciardi, BaBar c Production B(B- c X) = B(B- Lc- X) - B(B- Lc+ Lc- K) CKM allowed processes 1 Anticorrelated Lc production not many different ways 3 2 Stefania Ricciardi, BaBar ICHEP04