Tcc and double charm production

Slides:

Advertisements

Similar presentations

Diquarks in heavy baryons Atsushi Hosaka (RCNP, Osaka U. ） 9/10-13, 2013Charmed baryons1 Practical questions of hadron physics How ground and excited states.

Advertisements

CERN-07 SHLee 1 Heavy Exotic Particle Production from HIC at LHC Su Houng Lee Yonsei Univ., Korea with Shigehiro Yasui, Wei Liu, Che-Ming Ko.

Exotic hadrons with heavy quarks May. Shigehiro Yasui KEK.

Su Houng Lee 1. Hadrons with one heavy quark 2. Multiquarks with one heavy quark 3. Quarkonium Arguments based on two point function  can be generalized.

From hadrons to nuclei with charm and bottom flavors S. Yasui KEK Baryon

Tetraquark states in Quark Model Jialun Ping Youchang Yang, Yulan Wang, Yujia Zai Nanjing Normal University 中高能核物理大会 November 5-7, 2009, Hefei.

Su Houng Lee – (ExHIC coll.) 1. Recent findings of “Multiquark states” 2. Statistical vs Coalescence model for hadron production 3. Exotic production in.

Su Houng Lee – (ExHIC coll.) 1. Recent findings of “Multiquark states” + several comments 2. Statistical vs Coalescence model for hadron production 3.

Few ideas on Hadronic Physics at RHIC/LHC

EXOTIC MESONS WITH HIDDEN BOTTOM NEAR THRESHOLDS D2 S. OHKODA (RCNP) IN COLLABORATION WITH Y. YAMAGUCHI (RCNP) S. YASUI (KEK) K. SUDOH (NISHOGAKUSHA) A.

Charm hadrons in nuclear medium S. Yasui (KEK) K. Sudoh (Nishogakusha Univ.) “Hadron in nucleus” 31 Nov. – 2 Dec arXiv:1308:0098 [hep-ph]

Structure of the exotic heavy mesons Makoto Takizawa (Showa Pharmaceutical Univ.) Collaborators Sachiko Takeuchi (Japan College of Social Work) Kiyotaka.

The charmonium-molecule hybrid structure of the X(3872) Makoto Takizawa (Showa Pharmaceutical Univ.) Sachiko Takeuchi (Japan College of Social Work) Kiyotaka.

Quark dynamics studied in charmed baryons April 20, 2015ASRC Seminar1 Atsushi Hosaka, RCNP, Osaka ASRC Seminar Contents 1. Introduction 2. Structure: How.

Munich, June 16th, 2010Exotic gifts of nature1 XIV International Conference on Hadron Spectroscopy J. Vijande University of Valencia (Spain) A. Valcarce,

Molecular Charmonium. A new Spectroscopy? II Russian-Spanish Congress Particle and Nuclear Physics at all Scales and Cosmology F. Fernandez D.R. Entem,

Hadron Spectroscopy with high momentum beam line at J-PARC K. Ozawa (KEK) Contents Charmed baryon spectroscopy New experiment at J-PARC.

June 25, 2004 Jianwei Qiu, ISU 1 Introduction to Heavy Quark Production Jianwei Qiu Iowa State University CTEQ Summer School on QCD Analysis and Phenomenology.

Double charm production in e + e - -annihilation Anatoly Likhoded, IHEP, Protvino The conflict between Theory and Experiment in double charmonium production.

1 Heavy quark system in vacuum and in medium Su Houng Lee In collaboration with Kenji Morita Also, thanks to group members: Present: T. Song, K.I. Kim,

I=1 heavy-light tetraquarks and the Υ(mS) → Υ(nS)ππ puzzle Francisco Fernández Instituto de Física Fundamental y Matemáticas University of Salamanca.

Exotic baryon resonances in the chiral dynamics Tetsuo Hyodo a a RCNP, Osaka b ECT* c IFIC, Valencia d Barcelona Univ. 2003, December 9th A.Hosaka a, D.

1 Hadron Physics at RHIC Su Houng Lee 1. Few words on hadronic molecule candidates and QCD sum rules 2. Few words on diquarks and heavy Multiquark States.

Possible molecular bound state of two charmed baryons - hadronic molecular state of two Λ c s - Wakafumi Meguro, Yan-Rui Liu, Makoto Oka (Tokyo Institute.

1 Heavy multiquark systems from heavy ion collisions Su Houng Lee 1. Few words on light Multiquark States and Diquarks 2. Few words on heavy Multiquark.

Kondo effect in charm/bottom nuclei International workshop on J-PARC hadron physics in Tokai, 2-4 Mar Shigehiro Yasui Tokyo Institute of.

Su Houng Lee – (ExHIC coll.) 1. Few words on recent observations of Multiqaurk states 2. Particle production in Heavy Ion Collision 3. Exotica from Heavy.

University of Salamanca

Hadron Physics at Belle

Shigehiro Yasui Tokyo Institute of Technology

The study of pentaquark states in the unitary chiral approach

Exotic hadrons and nuclei with charm flavor

Doubly charmed mesons from hadronic molecules

Molecular Structures in Hidden Charm Meson and Charmed Baryon Spectrum

Puzzles in Quarkonium Hadronic Transition with Two Pion Emission

Hadron spectroscopy Pentaquarks and baryon resonances

Exotica production from ExHIC Su Houng Lee – (ExHIC coll.)

P. Gubler, T.T. Takahashi and M. Oka, Phys. Rev. D 94, (2016).

Exotic mesons in holographic QCD

Problems in Charmonium Production in e+e Annihilation and B Decay

Structure of Mass Gap Between Two Spin Multiplets

mesons as probes to explore the chiral symmetry in nuclear matter

Heavy quark spectroscopy and accurate prediction of b-baryon masses

Heavy quark spectroscopy and prediction of bottom baryon masses

Theoretical aspects of exotic hadrons

Mitja Rosina POSSIBILITIES OF DETECTING THE DD* DIMESONS at Belle2

On the nature of the X(3872) J. Vijande University of Valencia (Spain)

Quarkonium Spectroscopy

Possible Interpretations of DsJ(2632)

Exotic charmed four-quark mesons: molecules versus compact states

Charm2010 4TH International Workshop on Charm Physics

charm baryon spectroscopy and decays at Belle

d*, a quark model perspective

Double charmonium production in e+e– annihilation

Revisiting some long-standing puzzles in charmonium decays

Charmonium spectroscopy above thresholds

The 5-th International Conference on Quarks and Nuclear Physics

Hadron structure: quark-model analysis A. Valcarce

Yong-Liang Ma In collaboration with M. Harada

Internal structure of f0(980) meson by fragmentation functions

From J/ψ to LHCb Pentaquark ……and beyond

Nuclear Physics Group and IUFFyM University of Salamanca

Understanding DsJ*(2317) and DsJ(2460)

Could there be a more direct proof of multiquark configuration?

MOTIVATION AND POSSIBLE CHANNELS FOR THE SEARCH OF THE DD* DIMESON

Mitja Rosina THE BINDING ENERGY OF THE Ξcc++ BARYON

Heavy quark exotica and heavy quark symmetry

c c c c c c c c c c a Charmed baryon spectroscopy at Belle

Sixth International Conference on Quarks and Nuclear Physics

Edward Shuryak Stony Brook

Presentation transcript:

Tcc and double charm production arXiv:1209.6207 [hep-ph] Shigehiro Yasui (KEK, IPNS) Hyodo Tetsuo (Tokyo Tech.) Yan-Rui Liu (Tokyo Tech./Shandong U.) Makoto Oka (Tokyo Tech.) Kazutaka Sudoh (Nishogakusha U.) International Workshop on using Heavy Flavors to Probe New Hadron Spectroscopies/Dynamics @Haeundae Grand Hotel, Busan, 18-21 Nov. 2012

Contents 1. What’s doubly charmed exotic meson Tcc? – Mass spectroscopy 2. Tcc production in e+e- collisions 3. Summary & perspectives

1. Doubly charmed mesons (Tcc) Tetraquark Tcc1 Flavor Exotic Lee, SY, Liu and Ko (2008) Lee and SY (2009) ✓ no annihilation Tcc1 Important for study of quark-quark correlation color confinement c d u I(JP)=0(1+) strong ud attraction Gluon exchange force induces color-spin interaction ud pair 1/mC0 dominant attraction (3c, I=0, 1S0) cu pair 1/mC1 suppressed cc pair 1/mC2 more suppressed

1. Doubly charmed mesons (Tcc) Tetraquark Tcc1 Flavor Exotic Lee, SY, Liu and Ko (2008) Lee and SY (2009) ✓ no annihilation Tcc1 c d u Tcc is double charm |C|=2. cf. X(3872) is |C|=0. I(JP)=0(1+) strong ud attraction Gluon exchange force induces color-spin interaction ud pair 1/mC0 dominant attraction (3c, I=0, 1S0) cu pair 1/mC1 suppressed cc pair 1/mC2 more suppressed

1. Doubly charmed mesons (Tcc) Doubly charmed compact tetraquark I(JP)=0(1+) ・ J. P. Ader, J. M. Richard and P. Taxil, Phys. Rev. D 25, 2370 (1982). ・ S. Zouzou, B. Silvestre-Brac, C. Gignoux, J. M. Richard, Z. Phys. C30, 457 (1986). ・ H. J. Lipkin, Phys. Lett. B 172, 242 (1986). ・ L. Heller and J. A. Tjon, Phys. Rev. D 35, 969 (1987). ・ J. Carlson, L. Heller, J. A. Tjon, Phys. Rev. D37, 744 (1988). ・ B. Silvestre-Brac and C. Semay, Z. Phys. C 57, 273 (1993). ・ B. Silvestre-Brac and C. Semay, Z. Phys. C 59, 457 (1993). ・ C. Semay, B. Silvestre-Brac, Z. Phys. C61, 271-275 (1994). ・ S. Pepin, F. Stancu, M. Genovese and J. M. Richard, Phys. Lett. B 393, 119 (1997). ・ J. Schaffner-Bielich and A. P. Vischer, Phys. Rev. D 57 4142 (1998). ・ D. M. Brink and F. Stancu, Phys. Rev. D 57, 6778 (1998). ・ D. Janc and M. Rosina, Few Body Syst. 35, 175 (2004). ・ N. Barnea, J. Vijande, A. Valcarce, Phys. Rev. D73, 054004 (2006). ・ J. Vijande, E. Weissman, N. Barnea and A. Valcarce, Phys. Rev. D 76, 094022 (2007). ・ J. Vijande, E. Weissman, A. Valcarce, N. Barnea, Phys. Rev. D76, 094027 (2007). ・ J. Vijande, A. Valcarce and J. M. Richard, Phys. Rev. D 76, 114013 (2007). ・ D. Ebert, R. N. Faustov, V. O. Galkin and W. Lucha, Phys. Rev. D 76, 114015 (2007). ・ F. S. Navarra, M. Nielsen and S. H. Lee, Phys. Lett. B 649, 166 (2007). ・ M. Zhang, H. X. Zhang and Z. Y. Zhang, Commun. Theor. Phys. 50, 437 (2008). ・ S. H. Lee, S. Yasui, W. Liu, C. M. Ko, Eur. Phys. J. C54, 259-265 (2008). ← Diquark model ・ S. H. Lee, S. Yasui, Eur. Phys. J. C64, 283-295 (2009). ← Diquark model ・ Y. Yang, C. Deng, J. Ping and T. Goldman, Phys. Rev. D 80, 114023 (2009). ・ J. Vijande, A. Valcarce, N. Barnea, Phys. Rev. D79, 074010 (2009). ・ T. F. Carames, A. Valcarce and J. Vijande, Phys. Lett. B 699, 291 (2011). ・ J. Vijande, A. Valcarce and T. F. Carames, Few Body Syst. 50, 195 (2011). D(*)D(*) molecules with I(JP)=0(0-), 0(1+), 0(1-), 0(2+), 0(2-), 1(0-) ・ A. V. Manohar and M. B. Wise, Nucl. Phys. B 399 (1993) 17. ・ N. A. Tornqvist, Z. Phys. C 61, 525 (1994). ・ G. -J. Ding, J. -F. Liu and M. -L. Yan, Phys. Rev. D 79, 054005 (2009). ・ R. Molina, T. Branz and E. Oset, Phys. Rev. D 82, 014010 (2010). ・ S. Ohkoda, Y. Yamaguchi, S.Y., K. Sudoh, A. Hosaka, Phys. Rev. D86, 034019 (2012). ← Heavy Quark Symmetry + OPEP Lattice QCD (bottom) with I(JP)=0(0+) (?) ・ P. Bicudo, M. Wagner, arXiv:1209.6274 [hep-ph]. ・ Z. S. Brown, K. Orginos, arXiv:1210.1953 [hep-lat]. c d u Tetraquark Tcc1 Flavor Exotic Lee, SY, Liu and Ko (2008) Lee and SY (2009) ✓ no annihilation c d u Tcc1 I(JP)=0(1+) cc pair 1/mC2 ud pair 1/mC0 cu pair 1/mC1 Gluon exchange force induces color-spin interaction more suppressed dominant attraction (3c, I=0, 1S0) suppressed strong ud attraction D*- D0 ≈ 75 MeV (Binding energy) D* threshold (3880 MeV) D Stable bound state (weak decay only; D*Kπ) u c d +

1. Doubly charmed mesons (Tcc) Λc,Σc,Σc*(cqq) Tcc(ccqq) q=u,d,s cc qq flavor SU(3) qq flavor SU(3) Σc 1/2+ Σc* 3/2+ 0+ 1+ 2+ 3c(3S1) × 3c(3S1) 3c(3S1) “bad” diquark D*D* threshold color-spin interaction （fine mass-splitting） 200 MeV DD* threshold 75 MeV “good” diquark Tcc1 Λc 1/2+ 1+ × 3c(1S0) 3c(3S1) 3c(1S0)

1. Doubly charmed mesons (Tcc) Λc,Σc,Σc*(cqq) Tcc(ccqq) q=u,d,s cc qq flavor SU(3) × qq new!! 6c(1S0) 6c(1S0) flavor SU(3) 0+ Σc 1/2+ Σc* 3/2+ 0+ 1+ 2+ 3c(3S1) × 3c(3S1) 3c(3S1) “bad” diquark D*D* threshold × 1+ new!! 6c(1S0) 6c(3S1) color-spin interaction （fine mass-splitting） 200 MeV DD* threshold 75 MeV “good” diquark Tcc1 Λc 1/2+ 1+ × 3c(1S0) 3c(3S1) 3c(1S0)

1. Doubly charmed mesons (Tcc) Λc,Σc,Σc*(cqq) Tcc(ccqq) q=u,d,s cc 3c(1S0) 6c(3S1) 3c(3S1) 6c(1S0) 125 MeV 75 MeV 25 MeV 1+ 0+ 1+ 2+ 0+ qq flavor SU(3) × qq new!! 6c(1S0) flavor SU(3) Σc 1/2+ Σc* 3/2+ 3c(3S1) × 3c(3S1) “bad” diquark D*D* threshold × new!! 6c(1S0) color-spin interaction （fine mass-splitting） 200 MeV DD* threshold 75 MeV “good” diquark Tcc1 Λc 1/2+ × 3c(1S0) 3c(3S1)

1. Doubly charmed mesons (Tcc) Λc,Σc,Σc*(cqq) Tcc(ccqq) q=u,d,s cc 3c(1S0) 6c(3S1) 3c(3S1) 6c(1S0) 125 MeV 75 MeV 25 MeV 1+ 0+ 1+ 2+ 0+ qq flavor SU(3) × qq new!! 6c(1S0) flavor SU(3) Σc 1/2+ Σc* 3/2+ 3c(3S1) × 3c(3S1) “bad” diquark D*D* threshold × new!! 6c(1S0) color-spin interaction （fine mass-splitting） 200 MeV DD* threshold State mixing is suppressed by O(1/mc) in color-spin int. 75 MeV “good” diquark Tcc1 Λc 1/2+ × 3c(1S0) 3c(3S1)

1. Doubly charmed mesons (Tcc) Λc,Σc,Σc*(cqq) Tcc(ccqq) q=u,d,s cc 3c(1S0) 6c(3S1) 3c(3S1) 6c(1S0) 125 MeV 75 MeV 25 MeV 1+ 0+ 1+ 2+ 0+ qq flavor SU(3) × qq new!! 6c(1S0) flavor SU(3) Σc 1/2+ Σc* 3/2+ 3c(3S1) × 3c(3S1) “bad” diquark D*D* threshold × new!! 6c(1S0) color-spin interaction （fine mass-splitting） 200 MeV Tcc1 [6c] DD* threshold State mixing is suppressed by O(1/mc) in color-spin int. 75 MeV “good” diquark Tcc1 [3cbar] Tcc1 Λc 1/2+ × 3c(1S0) 3c(3S1)

Question to be addressed What is the production of Tcc1 [3cbar] and Tcc1 [6c] from e+e- collisions in Belle? Tcc1 [3cbar] ??? Tcc1 [6c] ??? cc e+ e- X (unobserved for cbarcbar) Cf. double charm production (cccbarcbar) in e+e- collisions (Belle, Phys. Rev. Lett. 89, 142001 (2002))

2. Tcc production in e+e- collisions L.O. p/2 inclusive process c Tcc1 [3cbar] or Tcc1 [6c] Tcc e- c g γ* c p/2 + (p3 ←→ p4) √ s p4 e+ cbar p3 (unobserved) cbar Factorization (Ansatz) short distance long distance h3 for [cc]3cbar(3S1) in Tcc1 [3cbar] h6 for [cc]6c(1S0) in Tcc1 [6c] unknown parameter: based on NRQCD formalism Cf. Bodwin, Braaten Lepage, PRD51, 1125 (1995)

+ 2. Tcc production in e+e- collisions p p/2 c Tcc e- γ* c p/2 g L.O. p/2 inclusive process c Tcc1 [3cbar] or Tcc1 [6c] Tcc e- γ* c + p/2 g + (p3 ←→ p4) √ s p4 cbar e+ cbar p3 (unobserved) cbar Factorization (Ansatz) short distance long distance h3 for [cc]3cbar(3S1) in Tcc1 [3cbar] h6 for [cc]6c(1S0) in Tcc1 [6c] unknown parameter: based on NRQCD formalism Cf. Bodwin, Braaten Lepage, PRD51, 1125 (1995)

2. Tcc production in e+e- collisions p uk(p/2) p/2 Tcc1 [3cbar] or Tcc1 [6c] c Tcc e- Projection for Tcc1 [3cbar](3S1) c g uj(p/2) γ* c p/2 anti-symmetric √ s p4 Projection for Tcc1 [6c](1S0) cbar e+ symmetric p3 (unobserved) cbar

2. Tcc production in e+e- collisions Tcc1 [3cbar] or Tcc1 [6c] Θ p √s=10.6 GeV (Belle) mc=1.5 GeV αs=0.26 Numerical Results Tcc1 [3cbar] [1/GeV] Tcc1 [6c] Remark : independent of h3(6) value.

2. Tcc production in e+e- collisions Tcc1 [3cbar] or Tcc1 [6c] Θ p √s=10.6 GeV (Belle) mc=1.5 GeV αs=0.26 Numerical Results Tcc1 [3cbar] Different behavior for Tcc1 [3cbar] and Tcc1 [6c] ・ Peak position and height ・ Θ-dependence ・ Threshold behavior [1/GeV] Tcc1 [6c] Remark : independent of h3(6) value.

2. Tcc production in e+e- collisions Numerical Results Absolute value of the cross section σ ? → How to fix h3 for Tcc1 [3cbar] and h6 for Tcc1 [6c] ?

2. Tcc production in e+e- collisions Numerical Results Absolute value of the cross section σ ? → How to fix h3 for Tcc1 [3cbar] and h6 for Tcc1 [6c] ? Estimate by quark model (crude approximation) c u d Tcc1 [3cbar] Tcc1 [6c] H.O. potential Cf. Ξcc production based on NRQCD formalism ・ Ma, Si, Physics Letters B568, 135 (2003) ・ Jian, Wu, Liao, Zheng, Fang, arXiv:1208.3051 [hep-ph]

2. Tcc production in e+e- collisions Numerical Results Absolute value of the cross section σ ? → How to fix h3 for Tcc1 [3cbar] and h6 for Tcc1 [6c] ? Estimate by quark model (crude approximation) c u d Tcc1 [3cbar] ≈ 0.089 GeV3 Tcc1 [6c] H.O. potential Cf. Ξcc production based on NRQCD formalism ・ Ma, Si, Physics Letters B568, 135 (2003) ・ Jian, Wu, Liao, Zheng, Fang, arXiv:1208.3051 [hep-ph]

2. Tcc production in e+e- collisions Numerical Results Absolute value of the cross section σ ? → How to fix h3 for Tcc1 [3cbar] and h6 for Tcc1 [6c] ? Estimate by quark model (crude approximation) c u d Tcc1 [3cbar] σ = 129 fb almost same as Ξcc ≈ 0.089 GeV3 Tcc1 [6c] H.O. potential Cf. Ξcc production based on NRQCD formalism ・ Ma, Si, Physics Letters B568, 135 (2003) ・ Jian, Wu, Liao, Zheng, Fang, arXiv:1208.3051 [hep-ph]

2. Tcc production in e+e- collisions Numerical Results Absolute value of the cross section σ ? → How to fix h3 for Tcc1 [3cbar] and h6 for Tcc1 [6c] ? Estimate by quark model (crude approximation) u c Tcc1 [3cbar] σ = 129 fb almost same as Ξcc d c ≈ 0.089 GeV3 Tcc1 [6c] H.O. potential Cf. Ξcc production based on NRQCD formalism ・ Ma, Si, Physics Letters B568, 135 (2003) ・ Jian, Wu, Liao, Zheng, Fang, arXiv:1208.3051 [hep-ph]

2. Tcc production in e+e- collisions Numerical Results Absolute value of the cross section σ ? → How to fix h3 for Tcc1 [3cbar] and h6 for Tcc1 [6c] ? Estimate by quark model (crude approximation) u c Tcc1 [3cbar] σ = 129 fb almost same as Ξcc d c ≈ 0.089 GeV3 Tcc1 [6c] H.O. potential ≈ 0.053 GeV3 Cf. Ξcc production based on NRQCD formalism ・ Ma, Si, Physics Letters B568, 135 (2003) ・ Jian, Wu, Liao, Zheng, Fang, arXiv:1208.3051 [hep-ph]

2. Tcc production in e+e- collisions Numerical Results Absolute value of the cross section σ ? → How to fix h3 for Tcc1 [3cbar] and h6 for Tcc1 [6c] ? Estimate by quark model (crude approximation) u c Tcc1 [3cbar] σ = 129 fb almost same as Ξcc d c ≈ 0.089 GeV3 Tcc1 [6c] σ = 43 fb H.O. potential ≈ 0.053 GeV3 Cf. Ξcc production based on NRQCD formalism ・ Ma, Si, Physics Letters B568, 135 (2003) ・ Jian, Wu, Liao, Zheng, Fang, arXiv:1208.3051 [hep-ph]

2. Tcc production in e+e- collisions Numerical Results Absolute value of the cross section σ ? → How to fix h3 for Tcc1 [3cbar] and h6 for Tcc1 [6c] ? Estimate by quark model (crude approximation) u c Tcc1 [3cbar] σ = 129 fb almost same as Ξcc d Upper limit c ≈ 0.089 GeV3 Tcc1 [6c] σ = 43 fb H.O. potential ≈ 0.053 GeV3 Cf. Ξcc production based on NRQCD formalism ・ Ma, Si, Physics Letters B568, 135 (2003) ・ Jian, Wu, Liao, Zheng, Fang, arXiv:1208.3051 [hep-ph]

3. Summary and perspectives ・ Tcc1 [3cbar] and Tcc1 [6c] are flavor exotic doubly charmed tetraquarks. ・ We estimate the cross sections of Tcc1 [3cbar] and Tcc1 [6c] produced in e+e- collisions. ・ The cross sections of Tcc1 [3cbar] and Tcc1 [6c] have different momentum- and angle-dependence. → Experimental method to identify the color structure (3cbar, 6c) of a quark pair in exotic hadrons? ・ More studies should be required. - Rigorous discussion about applicability of NRQCD formalism - Higher order in velocity-expansion - Precise estimate of expectation value of long-distance operator - ...

Thank you !!

Appendix

A. Del Fabbro, D. Janc, M. Rosina, D. Treleani, PRD71, 014008 (2005)

JP=1+ JP=1+ Mixing of Tcc1 [3cbar] and Tcc1 [6c] is suppressed !! Remark Mixing of Tcc1 [3cbar] and Tcc1 [6c] is suppressed !! ubar [ubardbar]6cbar(3S1) [ubardbar]3c(1S0) dbar JP=1+ JP=1+ Tcc1 [6c] magnetic gluon Tcc1 [3cbar] c [cc]6c(1S0) [cc]3cbar(3S1) c suppressed by 1/mc Time Tcc1 [6c] will decay almost to DD* in s-wave.