Charm at super Belle Jolanta Brodzicka Krakow Super

Charm at super Belle Jolanta Brodzicka (Krakow) Super KEKB Meeting 10 December 2008

Outline n n n Introduction Leptonic and semileptonic D(s) decays Rare decays Charmonium production in e+e. Spectroscopy: cc and exotics Summary D 0 -D 0 mixing and CPV covered on Thursday 2

Charm at Super. B Factory n n n B Factory at Y(4 S) is a factory of charm: σ(e+e-→BB)~1. 1 nb σ(e+e-→cc)~1. 3 nb Physics of charmed hadrons Ä test theoretical calculations (QCD and lattice QCD) Ä improve precision of CKM related measurements Ä search for new phenomena within SM and beyond Can we compete with Charm Factory? * Charm Factory: Cleo (0. 6/fb) + BESIII (2 -3 years of running) 3

Leptonic D(s)+ decays n n n Partial width for P→lν decay P=D+, Ds+ Leptonic part: Vcd (Vcs) Hadronic part: decay constants: f. D (f. Ds) (n. QCD involved: requires LQCD) Measurement of f. D and f. Ds (f. Ds /f. D): test of LQCD Impact on B decays e. g. constraint of ‘mixing side’ of UT: |Vtd/Vts| ~ √(Δmd/Δms )(m. Bd/m. Bs) f. Bs / f. Bd = 0. 2060 0. 0007(exp) +0. 0081 -0. 0060 (LQCD) More precise knowledge of f. Bs/f. Bd needed! 4

PRL 100, 241801 (2008) n n n Ds+→μν at Belle Ds+→μν most accesible: Γ(τν): Γ(μν): Γ(eν)=10: 1: 10 -5 BR(τ→hν)~11% tagged Ds 32 K e+e-→DKX Ds*→Dsγ X=nπ(γ) Number of tagged Ds from Mrecoil(DKXγ) → normalization for absolute BF Mrecoil(DKXγ) signal Ds 169± 16± 8 n Number of signal Ds+→μν from M 2 recoil(DKXγμ) n M 2 recoil(DKXγμ) For 548/fb : uncertainty of ~10% and needs improvement! 5

Leptonic decays: status Experiment vs lattice: f. D : consistent f. Ds : ~3σ discrepancy n n Statistical fluctuation? LQCD to be reexamined? H+ or leptoquarks contribute? PRL 100, 241802 (2008) n Belle method established for Ds+→μν : to be used for D+→μν (BF~4*10 -4) with s. Belle sample 6

Semileptonic D(s) decays n Partial width of D→P’lν P’=K, π q 2 =(pν + pl)2 n n n Form Factor f+(q 2) describes hadronic part Simple pole model: Modified pole model: pole: D* for D 0→πlν, D*s for D 0→Klν Ds→φlν Γ=Γ(q 2, χ, θl, θV) Form Factors: V(q 2), A 1(q 2), A 2(q 2) measured: r. V= V(0)/A 1(0) r 2=A 2(0)/A 1(0) FF (normalization & q 2 dependence) to test LQCD To tune/check calculations in B sector e. g. : |Vub| from B→πlν accuracy ± 3% from BF ± 10 -14% from Form Factor Goal: test LQCD to 5% 7

PRL 97, 061804 (2006) n n n D 0→K/π lν at Belle 282/fb e+e- →Dtag(*) X Dsig*→D 0πs X=nπK Number of tagged D 0 from Mrecoil(Dtag(*)Xπs) (→inclusive D 0 sample, normalization) Number of signal D 0→K/πlν from Mrecoil(Dtag(*)Xπs K/πl)=mν 2 D 0→Klν LQCD: 0. 040 ± 0. 002(stat)± 0. 005(syst) f+K(0) = 0. 695 ± 0. 007 ± 0. 022 f+π(0) = 0. 624 ± 0. 020 ± 0. 030 D 0→πlν In agreement with CLEO 8

Prospects of (semi)leptonic D(s) decays f+π(q 2) for D 0→πlν errors for 5/ab 9

Rare decays n Feasible exp. ground to look for New Physics: rare (loop) decays, mixing, CPV Leptonic rare/LFV decays: D 0→μμ, ee, μe n Belle sensitivity for 690/fb (preliminary MC study) 10 -6 n D 0→πll SM~10 -6 10 -7 n radiative decays SM~10 -6 -10 -4 10 -8 n D 0 → μμ ee μe 10

Charmonium production in e+e. NRQCD for prompt ψ production: ψgg ~ψg >>ψcc (LO) n Experiment: Ø e+e-→J/ψ(cc) dominates: n σ(e+e-→J/ψ (cc) )=0. 74± 0. 08+0. 09 -0. 08 pb σ(e+e-→J/ψ non-(cc) )=0. 43± 0. 09 pb (for 673/fb) Ø it’s a factory of charmonia with C=+ and J=0 σ*BF>2 [fb] (for 155/fb) J/ (2 S) n n c 25. 6 2. 8 3. 4 16. 3 4. 6 3. 9 c 0 6. 4 1. 7 1. 0 12. 5 3. 8 3. 1 c(2 S) 16. 5 1. 7 0. 4 16. 3 5. 1 3. 8 357/fb LO + NLO +relativistic corrections can accomodate experimental results Open questions: NNLO and/or color octet needed? 11

Charmonium production in e+en n n Experimental role is still leading To do with s. Belle: Precise measurements of e+e-→J/ψ(cc) and ψ(2 S)(cc) -sections, production/helicity angle) Study of e+e-→ηc(cc), χc. J(cc), ηc(2 S)(cc) 693/fb e+e-→J/ψ ηc (x M(DD) M(DD*) X(3940) Ø n n e+e-→J/ψD(*) : new states in D(*) system high statistic measurement of mass/width/shape angular analysis of X states needed M(D*D*) X(4160) 12

Charmonium spectrosocpy m(DD) predicted measured 13

Charmonia below DD n n ηc ηc’: mass, width, line shape measurement Precise measurements of hyperfine splittings: m(ηc) – m(ψ) → test of models and LQCD (hyperfine splitting underestimated) ηc(1 S) mass: 2980. 3± 1. 2 Me. V n n n ηc(1 S) width: 26. 7± 3. 0 Me. V Effect of ηc line shape? Only in M 1 transition ψ→γηc ? ηc’: Ks. Kπ is only known decay; PDG 08: m=3637± 4 Me. V Γ=14± 7 Me. V B→Kηc and ηc→Ks. Kπ at Belle with 500/fb m and Γ accuracy: ηc: σ(m)~2 Me. V σ(Γ)~3 Me. V ηc’: σ(m)~6 Me. V σ(Γ)~9 Me. V s. Belle: precision + other decay modes 14

Charmonia below DD n n n hc(1 P) finally observed by Cleo: ψ(2 S)→π0 hc hc→γηc m(hc) = 3525. 20 ± 0. 18 ± 0. 12 Me. V hyperfine splittng χc(3 PJ) – hc(1 P 1)~0 challenge for theory Confirmation of hc at s. Belle? B→hc. K hc→ηcγ factorization violating mode Belle with 253/fb: BF<3. 8*10 -5 @90%C. L assuming BF(hc→ηcγ)=0. 5 e+e-→ηchc , χc 0 hc : in recoil of C=+1 charmonia ηc , χc 0 reconstructed with BF~O(10 -3) → 5/ab needed 15

Charmonia above DD n n DD* D* D* Y(4660) Missing components requiring s. Belle data: DD*π, D*D*π, Ds. Ds*, Ds*Ds* Insight into Y family Y(4350) (4160) DDπ (4415) n ? Y(4260) n DD (4040) n Parameters of vector states: ψ(3770), ψ(4040), ψ(4160), ψ(4415) From fit to inclusive hadronic x-section by BES Belle: access to 1 -- states through ISR Fits to exclusive x-sections: strong model dependence. Fits to be attempted with more precise x-section measurements. Y(4008) n Λc+Λc– 16

1 -- Y family Exotic family? n n n Large Γ(Y→ψππ)~O(Me. V) Small Γ(D(*)): qualitative conclusion Not enough empty 1 -- cc slots to fill e+e-→p+p-J/ Y(4260) Y(4008) More ISR studies using s. Belle data: n n Conclusion on Y(4008)? Y→ψπ0π0 check of isospin relation Y→DD 1(2420), D*D*0 →DD*π test of molecular scenario Y→DD 1(2420), J/ψη’, χc. Jω test of hybrid scenario Y(4360) e+e-→p+p- ’ Y(4660) 17

Action items for X(3872) Studies of B→X(3872)K: n n n n B K D 0 D*0 605/fb D*→Dγ X(3872)→D 0 D*0 : mass, width, line shape X(3872)→D 0 D 0π0 X→J/ψπ+π- width X→J/ψπ0π0 check isospin relation X→J/ψπ+π- π0 isospin violating mode X→J/ψπ+π0 critical for 4 -quark scenario X→J/ψγ signal 14± 4 (4σ) for 256/fb X→ψ’γ, χc 1γ problematic for molecular scenario B+→XK+ 605/fb Ns=125± 14 M(J/ψπ+π-) D*→D 0π0 m(X)=3872. 6+0. 5 -0. 4 ± 0. 4 Me. V Γ=3. 9+2. 5 -1. 3+0. 8 -0. 3 Me. V B 0→XK 0 Ns=30± 7 M(J/ψπ+π-) 18

Z± cc-like states Z+(4050) Z+(4248) Further studies with s. Belle data: Precision mass/width n Spin-parity determination n Search for Z 0→ψπ0 , χc 1π0 test of [cu][cd] tetraquark scenario n Z→D*D 1(2420)→D*D*π test of molecular scenario n n Search for new Z±’s: Z→DD, D*D* Z→J/ψπ+ , ηcπ+ , . . . Z+(4430) M 2 (ψ ’ π + ) M(χc 1π+) Results of Dalitz plot fit for: B→ Kψ’π+ and B→ Kχc 1π+ 19

Summary n n A lot of charm studies with Belle data Good prospects for more with Super Belle: precision (semi)leptonic D(s) decays access to rare decays understand charmonium production identify XYZ states study of baryons/mesons 20

Backups 21

Hadronic x-sections (4415) Y(4660) Y(4260) Y(4350) (4160) (4040) n Y(4008) n From CLEO: scan at 3. 97 -4. 26 Ge. V in 12 points Total hadronic x-section above DD from BES Belle: sum of all measured exclusive contributions (3770) n Durham Data Base 22

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