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1 CHARM MESON SPECTROSCOPY AT Amina ZGHICHE CNRS-IN2P3, LAPP Annecy On behalf of the BaBar Collaboration 1 A. Zghiche CHARM 2007 August 8 th 2007
2 2 A. Zghiche CHARM 2007 August 8 th 2007 BABAR B AND c-factory
3 Expected Mass splitting s c L s q j q (L S q ) S c Mass j q is a good quantum number => separated D (s) meson spin-doublets: (0-,1-), (0+,1+), (1+,2+). 2S 1P L=1 j q =1/2 0 + D (s)1 D (s)0 j q =3/ cq D (s)2 D (s)1 1S L= D (s) * D (s) 3 A. Zghiche CHARM 2007 August 8 th 2007
4 cq (q=ʉ,d) MESONS WHAT IS NEW FOR D (*)(*) STATES? 4 A. Zghiche CHARM 2007 August 8 th 2007
5 Absolute BF of D (*)(*) with Y(4S) events π X - ϒ (4S) B - e + B + B + K - π + D (*)0 π,ρ, a 1 X=D (*)(*)0 π + B 0 BABAR: Phys. Rev. D74 (2006) A. Zghiche CHARM 2007 August 8 th 2007
6 Absolute BF of D (*)(*) with Y(4S) events BABAR: Phys. Rev. D74 (2006) A. Zghiche CHARM 2007 August 8 th 2007
7 Absolute BF ratios Phys. Rev. D74 (2006) Missing mass Method Phys. Rev. D75 (2007) Exclusive method PDG BF 2.83±0.25 x ±0.21 x ±0.29 x ±0.4 x ±0.035± ±0.034± A. Zghiche CHARM 2007 August 8 th 2007
8 Precision measurement of D 0 mass from CLEO-c 8 A. Zghiche CHARM 2007 August 8 th 2007
9 Orbitally excited D** 0 and D** + mesons (exclusive in B decays) (2465.7±1.8±0.8± 1.2 ) MeV/c (49.7±3.8±4.1± 4.9) MeV M Dπ (GeV/c 2 ) Theory and experiment are in good agreement 9 A. Zghiche CHARM 2007 August 8 th 2007
10 cs MESONS mini-review D s0 *(2317) and D s1 (2460): surprising states D s1 (2536) and D s2 (2573): precision measurements D sj *(2860): new state X(2690) and D sj (2700): even more new states, or are they the same state? 10 A. Zghiche CHARM 2007 August 8 th 2007
11 CURRENT SITUATION D sj *(2860) X(2690) D sj (2700) D s1 (2460) D s0 *(2317) S wave P wave D wave Prior to B-factories, only 4 states observed: D s (1968),D s *(2112),D s1 (2536) and D s2 (2573) D s0 *(2317) +, Apr. 2003: unexpected observation of a narrow resonance in BaBar D s1 (2460) +, May 2003: CLEO, BaBar observed a new narrow resonance D sj *(2860) +, Jul. 2006: new state discovered by BaBar X(2690) +, Jul. 2006: broad enhancement seen in BaBar D sj (2700) +, Jul. 2006: new state discovered by Belle ( X(2690)?) 11 A. Zghiche CHARM 2007 August 8 th 2007
12 D s0 *(2317) IN INCLUSIVE DATA Study of e + e - cc events Resonance in D s+ π 0 Complex kinematics with competing contributions and mutual cross-feed 232 fb -1 D s+ π 0 final states D s0 *(2317) Properties M = ( ± 0.2 ± 1.4) MeV/c 2 Γ < 3.8 MeV at 95% CL Contribution from D s * (2112) Contribution from D s1 (2460) No decay to D s+ π + or D s+ π - No indication of isospin partners No D s1 (2460) + D s+ π 0 12 A. Zghiche CHARM 2007 August 8 th 2007 BaBar: Phys. Rev. D74 (2006)
13 D s1 (2460) IN INCLUSIVE DATA D s1 (2460) observed in 3 decay final states D + s γ final states 232 fb -1 D s1 (2460) D s + π 0 γ final states D s1 (2460) D s + π + π - final states D s1 (2460) D s1 (2536) Contribution from D s *(2112) Contribution from D s0 (2317) bkg subtracted No D s0 *(2317) + D s + γ Properties M = ( ± 0.2 ± 0.8) MeV/c 2 Γ < 3.5 MeV at 95% CL No D sj *(2317) + D s + π + π - BaBar: Phys. Rev. D74 (2006) A. Zghiche CHARM 2007 August 8 th 2007
14 Absolute BF of D sj (2460) with Y(4S) events 14 A. Zghiche CHARM 2007 August 8 th 2007
15 D s0 *(2317) AND D s1 (2460) UPDATE Discovered 4 years ago in e + e - cc events, observed in B decays D s0 *(2317) and D s1 (2460) very well established and known experimentally Masses and widths Natural J P : 0 + for D s0 *(2317) and 1 + for D s1 (2460) decay modes and branching fractions Interpretation of these new states still unclear! One possibility: identify these 2 states as the 0 + and 1 + cs states However strong difficulties within the potential model Other possibilities 4 quark states? DK molecule? Dπ atom? Chiral symmetry? More unexpected? Yes! 15 A. Zghiche CHARM 2007 August 8 th 2007 Belle: Phys. Rev. Lett. 91 (2003) BaBar: Phys. Rev. D74 (2006) Belle: Belle-Conf-0461 (2006) BaBar: Phys. Rev. D74 (2006)
16 Analysis of D s1 (2536) D*K s p*(d*k s )>2.7 GeV/c 16 A. Zghiche CHARM 2007 August 8 th 2007
17 Analysis of D s1 (2536) D*K s MeV/c 2 MeV/c 2 difference MeV 17 A. Zghiche CHARM 2007 August 8 th 2007
18 Inclusive study of DK - D s2 (2573) 18 A. Zghiche CHARM 2007 August 8 th 2007 D s1 D*K reflection BaBar: PRL97(2006),222001
19 cs MESONS WHAT IS NEW FOR D sj STATES? 19 A. Zghiche CHARM 2007 August 8 th 2007
20 D sj *(2860): NEW STATE Looking in the cc continuum: e + e - D 0 (K - π +,K - π + π 0 )K + X and e + e - D + (K - π + π + )K 0 s X D 0 (K - π + )K + D 0 (K - π + π 0 )K + D + (K - π + π + )K 0 s D s1 (2536) D s1 (2536) D s2 (2573) 240 fb -1 D s2 (2573) D s2 (2573) D s1 (2536) New state at 2860 MeV/c 2! Bump at 2690 MeV/c 2? 20 A. Zghiche CHARM 2007 August 8 th 2007 BaBar: Phys. Rev. Lett. 97 (2006)
21 D sj *(2860) AND X(2690)? Combining the 3 modes M = ( ± 1.5 ± 5.0) MeV/c 2 Γ = (47 ± 7 ± 10) MeV J P = 0 +, 1 -, 2 +, Final state is DK, i.e. two pseudoscalars not seen in D*K Interpretation? Radial excitation of D s0 *(2317)? hep-ph/ cs with J P = 3 -? hep-ph/ cs with J P = 0 +? hep-ph/ Sum of 3 modes X(2690) 240 fb -1 bkg subtracted D sj *(2860) Another structure at 2690 MeV/c 2? M = (2688 ± 4 ± 3) MeV/c 2 Γ = (112 ± 7 ± 36) MeV Needs confirmation by other experiments 21 A. Zghiche CHARM 2007 August 8 th 2007 BaBar: Phys. Rev. Lett. 97 (2006)
22 EVEN MORE STATES: D sj (2700) Study of B D ( * ) D ( * ) K decays in BaBar (22 modes) Looking at 8 DK + 8 D*K invariant masses, adding 15 decay modes wrt Belle Summing all 8 DK modes Summing all 8 D*K modes 347 fb -1 Phase space D s1 (2536) New result preliminary Background (generic MC) Enhancement observed around 2700 MeV/c 2 in DK and D*K Additional cs surprise? Maybe! Low mass enhancement in DK? Belle sees it and uses an exponential One or two resonances around GeV/c 2 in D*K? already there in PRD68(2003) Need to perform a full Dalitz plot analysis Takes into account interferences 22 A. Zghiche CHARM 2007 August 8 th 2007 BaBar: preliminary
23 SUMMARY Almost no new resonant states in more than 20 years Many new ones since 1999, start of Belle and BaBar! New open charm discovered: D sj* (2860), Next: Confirm X(2690) (?=D sj (2700)) experimentally and theoretically Precise measurement of D sj parameters : D s0* (2317), D s1 (2460): mass D s1 (2536): mass, width Experimental status: Lots of on-going analyses with the current dataset More decay modes investigated to understand these resonances Belle and BaBar are taking data till end of 2008 Lots of new data to analyse! 23 A. Zghiche CHARM 2007 August 8 th 2007
24 24 A. Zghiche CHARM 2007 August 8 th 2007 ADDITIONAL SLIDES
25 Potential models and Energy-splitting 25 A. Zghiche CHARM 2007 August 8 th 2007
26 J P OF D s0 *(2317) AND D s1 (2460) D sj in B decays: B D + sj D ( * ) D s0 *(2317) + D s+ π 0 D D s1 (2460) + D s * + π 0 s1 (2460) + D s+ γ 249 fb -1 J=1 D-wave J=0 J=1 J=2 S-wave J P 0 + Natural J P : 0 + for D s0 *(2317) and 1 + for D s1 (2460) Confirmed by pattern of decay modes 26 A. Zghiche CHARM 2007 August 8 th 2007 J 1 J P 1 - excluded J P 1 + Belle: Belle-Conf-0461 (2006) BaBar: PRL 93, (2004)
27 EVEN MORE STATES: D sj (2700) Study of B + D 0 D 0 K + Looking at the Dalitz plot and the D 0 K + projection New resonance decaying to D 0 K + B + D 0 D sj, D sj D 0 K + M = (2715 ± ) MeV/c2 Γ = (115 ± ) MeV J P = 1 - favored Dalitz plot D sj (2700) D 0 K + projection D sj (2700) Same resonance as seen by BaBar in continuum, X(2690)? Mass and width consistent, same decay mode D 0 K + projection D sj (2700) bkg subtracted 414 fb -1 Background J=1 Interpretation? cs state 2 3 S 1? expected mass at 2720 MeV/c 2 Chiral symmetry: doublet paired with D s1 (2536)? J=2 J=0 Phys.Polon. B 35, 2377 (2004) 27 A. Zghiche CHARM 2007 August 8 th 2007 Belle: hep-ex/
28 Charm Strange mesons 28 A. Zghiche CHARM 2007 August 8 th 2007
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