Nouveaux Etats mésoniques découverts avec les usines
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1 Nouveaux Etats mésoniques découverts avec les usines à B Réunion du GDR Physique subatomique et calculs sur réseau LAL, Orsay juin 2007 Denis Bernard LLR Ecole Polytechnique France Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 1
2 New Resonances Tentatively assigned to Charmonium states : h c 1 1 P 1 (CLEO) ψ(2s) π 0 h c (γη c ) X(3943) η c (3 1 S 0 (cc))? (Belle) recoil on J/ψ in e + e Y (3940) χ c1(2 3 P 1 (cc))? (Belle) B (J/ψ ω)k Z(3930) χ c2(2 3 P 2 (cc))? (Belle) γγ DD Certainly not Charmonium states (What are they?) : X(3872) Y (4260) (Belle) (BaBar) Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 2
3 ψ(2s) decays. ψ(2s) π 0 h c (γη c ) Exclusive Inclusive M(h c ) = ± 0.6(stat) ± 0.4(syst) MeV M( 3 P J ) M( 1 P 1 ) = 1.0 ± 0.6(stat) ± 0.4(syst) MeV CLEOc PRL 95, (2005) Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 3
4 X(3943) : e + e J/ψ X Double charmonium production 350 fb 1 hep-ex/ (LP 2005) M = 3943 ± 6 ± 6 MeV Γ = 15.4 ± 10.1 MeV. BR(X D D ) = ± 22%, BR(X D D) < 41% (90% CL), and BR(X ωj/ψ) < 26% (90% CL). Possibly 3 1 S 0 (c c) η c state Test γγ D D (S. Godfrey FPCP 2006, hep-ph/ ) Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 4
5 B Y (3940)K, Y (3940) J/ψ πππ 0 > 8σ 253 fb 1 PRL 94, (2005) M = 3943 ± 11 ± 13 MeV Γ = 87 ± 22 ± 26 MeV. not yet seen in Y D D or D D. χ c1 state (2 3 P 1 (c c)) Test : see DD, don t see DD.. (Godfrey). but B s... Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 5
6 γγ Z(3930) DD γγ D D : J P C = 0 ++, 2 ++ M = 3929 ± 5 ± 2 MeV Γ = 29 ± 10 ± 2 MeV Γ γγ B D D = 0.18 ± 0.05 ± 0.03 kev. D D angular distrib. consistent with J = 2. Probably χ c2 state (2 3 P 2 (c c)) Test : exclude χ c0 by observing DD (DD /DD 1/3 for χ c2) (Godfrey) 395 fb 1 PRL 96, (2006) Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 6
7 Charmonia from lattice QCD G. Bali hep-lat/ Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 7
8 X(3872) Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 8
9 X(3872) Observation Discovered by Belle in B KX(3872), X(3872) J/ψ π + π Confirmed by BaBar, Also seen in inclusive production in pp by D0, CDF. Belle BaBar CDF D0 PRL91 :262001,2003 PR.D71 :071103,2005 PRL93 :072001,2004 PRL93 :162002,2004 Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 9
10 X(3872) Mass : 2005 m = ± 0.5 MeV/c 2 (D 0 D 0 threshold is at ± 1.0 MeV/c 2 ) PDG04 M X(3872) M D 0 D 0 = 0.6 ± 1.1 MeV/c2 Narrow Γ < % CL. (Belle) < 4.1 MeV (BaBar) Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 10
11 X(3872) Mass and CLEO s D 0 Mass Ψ(3770) D 0 D 0, D 0 KSφ, 0 (π + π )(K + K ) Very small background D 0, KS, 0 φ, have small momenta D 0 mass calibrated by KS, 0 φ mass. CLEO PRELIMINARY T. ICHEP ± 0.15 ± 0.20 MeV/c ± 0.40 MeV/c 2 PDG 06 fit ± 1.00 MeV/c 2 PDG 06 average M X(3872) = ± 0.5 MeV/c 2 PDG 06 M X(3872) M D 0 D 0 = 0.1 ± 1.0 MeV/c2 PDG ± 0.7 MeV/c 2 PDG 06+CLEO Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 11
12 X(3872) : Branching Fraction 256 fb 1 hep-ex/ (LP 2005) (13.1 ± 2.4 ± 1.3) fb 1 PRD (R) 2006 (8.5 ± 2.3 ± 0.8) 10 6 B(B KX) B(X π + π J/ψ ) = (10.5 ± 1.8) Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 12
13 X(3872) : Search for a Charged Partner If X(3872) is isospin 1, then B(B KX ± ) 2B(B KX 0 ) B(B 0 X K +, X J/ψ π π 0 ) < B(B X K 0, X J/ψ π π 0 ) < % C.L. 212 fb 1 No signal observed I 1 Phys.Rev.D71 :031501,2005 Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 13
14 Observation of X(3872) J/ψ γ B X(3872)K, X(3872) J/ψ γ 256 fb σ hep-ex/ , 260 fb σ PRD 74 :071101,2006 Implies C X(3872) = +1 No X seen I X(3872) 1 C (π + π ) = 1 l (π+ π ) odd I (π + π ) = 1, P (π + π ) = 1 l (π+ π ) odd indicates P-wave, i.e. ρ Check : X J/ψ π 0 π 0 forbiden. Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 14
15 X(3872) : π + π Invariant Mass Distribution hep-ex/ Phys. Rev. D 73, (R) (2006) Dipion mass consistent with ρ 0 π + π : again C X(3872) = +1 (Isospin violating again) S-wave J/ψ ρ favored : J ++ favored over J + P X(3872) = +1 C.L. of χ 2 = 28% vs 0.1% Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 15
16 Angular Analysis of X(3872) J/ψ π + π In the limit where the X(3872), J/ψ and ρ rest frames coincide dn/d(cos θ lπ ) sin 2 θ lπ disfavored. hep-ex/ Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 16
17 Search for B X(3872)K, X(3872) D 0 D 0 π : DD in an S-wave q 2 ++ : DDπ in a D-wave q 5 q momentum of D in X(3872) frame M = ± MeV/c2 m m D 0 +D 0 = 4.3 ± 0.7 MeV/c2 B(B DDπ 0 K) = (1.27 ± ) σ 414 fb 1 Preliminary 2 ++ disfavored. hep-ex/ Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 17
18 CDF 3D Angular Analysis Method checked on ψ(2s) J P C = 1 X(3872) : Only J P C = 1 ++ and 2 + compatible with data! (Belle had strongly disfavored 2 + assignment (hep-ex/ )) 1 ++ left 780 pb 1 CDF Run II Preliminary M. ICHEP Test : 1 ++ ( 3 P 1 ) ψγ vs 2 + ( 1 D 2 ) h c γ (Barnes, Godfrey PRD ) Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 18
19 X(3872) : Not a Charmonium Meson 1 : 1 ++ is χ c1 (predicted at 3950 MeV/c 2 X(3872) is too light! Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 19
20 Direct Measurement of B(B XK + ) Inclusive Search on the Recoil : B XK One reconstructed B (NN1) One selected K (NN2) K momentum computed in recoil B rest frame B s. Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 20
21 Inclusive Searches : B XK + B(B X(3872)K) = (0.5 ± 1.4)10 4 < B(X(3872) J/ψ π + π ) > 4.3% at 90% CL. 2 : Too large for an isospin violating decay (e.g. B(ψ(2S) J/ψ π 0 ) = 0.10 ± 0.02%) 210 fb 1 Phys.Rev.Lett.96 :052002,2006 Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 21
22 Measuring Isospin Violation in X(3872) Decay Observation of B X(3872)(J/ψ π + π π 0 )K, consistent with Isospin-conserving X(3872) J/ψ ω 4.3 σ B(X(3872) J/ψ ω) B(X(3872) J/ψ ρ) B(X(3872) J/ψ π+ π π 0 ) B(X(3872) J/ψ π + π ) = 1.0 ± 0.4 ± fb 1 hep-ex/ Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 22
23 X(3872) : Interpretation? quark models Predictions : Diquark-antidiquark ; Maiani et al., PRD (2005) 2 neutral states X u = [cu] [cu], X d = [cd] [ cd ], 2 charged states X + = [cu] [ cd ], X = [cd] [cu] Neutral states produced in B 0 and B + decays, m(x d ) m(x u ) (7 ± 2) MeV/c 2. S-wave D 0 D 0 molecule ; Braaten & Kusunoki, PRD 71 (2005) using B D ( ) D ( ) K BF s, factorization, heavy quark and isospin symmetry. B 0 X(3872)K 0 Suppressed by 1 order of magn. wrt B + X(3872)K + They need the Dalitz plot analysis of B D ( ) D ( ) K! Swanson predicts R Phys.Rept.429 : ,2006 Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 23
24 X(3872) in Exclusive B + and B 0 Decays B + X(3872)K σ B 0 X(3872)K σ R = B 0 /B + = 0.50 ± 0.30 ± 0.05, 0.15 < R < 1.34 at 90% CL m = 2.7 ± 1.3 ± 0.2 MeV/c 2 (mass resolution Γ = 5.4 MeV/c 2 ) R : Molecule model in trouble? m : Di-Diquark model in trouble? Need more statistics! σ m 0.6 MeV/c 2 / L( ab 1 ) σ R 0.17/ L( ab 1 ) 211 fb 1 PRD (R) 2006 Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 24
25 R = 0/+, m, in Belle s B KX(3872) (D 0 D 0 π 0 )? 414 fb 1 Preliminary hep-ex/ Signal ɛb 10 4 N obs sig, σ B 10 4 B D 0 D 0 π 0 K 2.12± ± ± B + D 0 D 0 π 0 K ± ± ± B 0 D 0 D 0 π 0 K ± ± ± R compatible with 1?!?! m? Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 25
26 X(3872) B s : Let s Go Inclusive Again! B(B X(3872)K) = (0.5 ± 1.4) 10 4 < (BaBar) B(B X(3872)K) B(X(3872) π + π J/ψ ) = (10.5 ± 1.8) (av) B(B X(3872)K)B(X(3872) DDπ 0 ) = (1.27 ± ) 10 4 (Belle) B(B X(3872)K) (similar to factorization suppressed B χ c0 K) X(3872) DDπ 0 dominant? 4.3% < B(X(3872) J/ψ π + π ) < 7.6% Inclusive B(B X(3872)K) should be detectable σ B = / L( ab 1 ) Due to DDπ 0 possibly saturating the width, a D 0 tag would help lower the BKG! Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 26
27 Y(4260) Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 27
28 A New 1 Resonance Decaying to J/ψ π + π in Initial State Radiation Production Was searching for e + e X(3872)γ, X(3872) J/ψ π + π Found a new resonance m = 4259 ± 8 MeV/c 2, Γ = 88 ± 23 MeV, > 8σ Γ(Y e e ) B(Y J/ψ π + π ) = 5.5 ± ev. Detection of ISR γ not required 211 fb 1 Phys. Rev. Lett. 95, (2005) Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 28
29 ISR Checks All events : J/ψ π + π system recoiling against m Rec Events with γ reco ed ( 25%) : extensive checks. Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 29
30 Confirmed by Belle, CLEO 553 fb 1 13 fb 1 G. ICHEP 06. I. ICHEP 06 and PRL 96 :162003,2006 Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 30
31 Search for Y (4260) ψ(2s)π + π in ISR Production e + e Y (4260)γ ISR Y (4260) ψ(2s)π + π ψ(2s) J/ψ π + π Detection of ISR γ not required Preliminary 298 fb 1 X. ICHEP 06. (hep-ex/ ) Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 31
32 Y (4260) ψ(2s)π + π in ISR Production m = (4324 ± 24) MeV/c 2, Γ = (172 ± 33) MeV (statistical errors only) Preliminary 298 fb 1 hep-ex/ (mass range used in fit shorter than that used in X. ICHEP 06) Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 32
33 Y : One or Two States? m( MeV/c 2 ) Γ( MeV) J/ψ π + π 4259 ± ± ± > 8σ BaBar ± 5 4.9σ CLEOc ψ(2s)π + π 4295 ± ±4 133 ± > 7σ Belle Preliminary 4324 ± ± 33 BaBar Preliminary (stat only) Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 33
34 cc Meson? Bizarre If 1, should be produced directly in e + e collisions R( s) = σ(e + e hadrons)/σ(e + e µµ) PDG 04 Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 34
35 Direct Production in e + e Collision Scan by CLEOc Phys.Rev.Lett.96 :162003,2006 J/ψ π + π : 11σ J/ψ π 0 π 0 : 5.1σ π 0 π 0 seen as expected for S-wave dipion with I 1 π + π /π 0 π 0 2 confirms I = 0 Kills χ c1 ρ 0 molecule model Liu et al., Phys.Rev.D72 :054023,2005 Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 35
36 Search for Y (4260) DD in ISR D 0 and D ± reconstructed in a series of 2 4 body decays. Detection of ISR γ not required r = B(Y (4260) D D) B(Y (4260) J/ψπ + π ) < 7.6 at 95% C.L. (r 500 for ψ(3770)) fb 1 hep-ex/ (ICHEP 06) Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 36
37 Search B Y K Decays B Y = B(B Y (4260)K, Y (4260) J/ψ π + π ) = (2.0 ± 0.7 ± 0.2) < Not conclusive (3.1σ) 211 fb 1 Phys.Rev.D73 :011101,2006 Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 37
38 Not a Charmonium Meson 1 slots : S, D T. Barnes, S. Godfrey and E. S. Swanson, Phys.Rev.D72 :054026,2005 Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 38
39 Glueball? If ggg, flavorblind decays (Zhu, Phys.Lett.B625 :212,2005) No : B Y φπ + π ΓY ee < 0.4 ev (90% C.L.) Detection of ISR γ required 232 fb 1 Preliminary (Moriond 2006). Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 39
40 Other Models TetraQuark? (cs)(cs) predicts D s + D s DD searches of D s + D s, DD in progress L.Maiani et al. Phys.Rev.D72 :031502,2005 An ωχ c1 Molecule? Γ(Y χ c1 π + π π 0 ) Γ(Y J/ψ π + π ) Γ(Y J/ψ π + π π 0 ) Γ(Y J/ψ π + π )/2 C.Z. Yuan, P. Wang, X.H. Mo, Phys.Lett.B634 : ,2006 Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 40
41 An Hybrid Meson? ccg bound states, searched for for ages... J P C = 1 + is the lightest Hybrids favored 2-body decay to (P = +,P = ) Y Decays to DD 1 (2420) should dominate!! DD, D D, DD suppressed Search for companions with other quantum numbers! T. Barnes, F. E. Close and E. S. Swanson, Phys.Rev.D52 : ,1995 Kou, Pene, Phys.Lett.B631 : ,2005 Y(4260) on the (quenched) Lattice QCD : 1 : m = 4.38 ± 0.15 GeV/c 2 Xiang-Qian Luo, Yan Liu, Phys.Rev.D74 :034502,2006 Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 41
42 Spectroscopy : Charmonium / baryons) B factories are yielding many results besides CKM Physics. Today : A sample only : Charmonium : A new revolution? Charmonium meson slots filling up (many tests still to be made) X(3872) : 1 ++! might be Tetraquark ; Molecule? diquark-antidiquark? Y(4260) : 1! Hybrid? Stay tuned : Data taking Extension to other final states will continue for the next years : much more to come! Denis Bernard juin 2007 GDR LQCD, LAL Orsay. 42
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