Su Houng Lee 1. Few words on a recent sum rule result 2. A simple constituent quark model for D meson 3. Consequences 4. Summary D meson in nuclear medium:

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Presentation transcript:

Su Houng Lee 1. Few words on a recent sum rule result 2. A simple constituent quark model for D meson 3. Consequences 4. Summary D meson in nuclear medium: a consituent quark model picture 1 Acknowledgement: A. Park, W. Park, Sungtae Cho, P. Gubler, M. Harada, S. Nonaka + group members

2 I: Few words on recent QCD sum rule result arXiv: By Susuki, Gubler, Oka

3 arXiv: : QCD sum rule +Maximal entropy method

4 electron neutron proton Nucleus quark gluon quark Mass of an Atom Nucleon: % electron: 0.05 % EM binding< % Understanding the mass of a composite object Nucleus Nucleons: 99% Nuclear binding < 1 % Nucleon Quark < 5 % The rest ?? QCD

5 Chiral symmetry breaking for quarks Symmetric phase L, R symmetry, Massless quark Spontaneous symmetry breaking: Y. Nambu (2008 NP) Broken phase Vector symmetry, Massive quark NJL model  gap equation  quark mass +

6 Constituent quark mass m q = 350 MeV  Nucleon 938 MeV : M N =3 m q + something c  Charmed meson (D meson) 1870 MeV : M D = charm quark (1500MeV)+ m q + something q If decreases  m q will decrease  M D will decrease

7 II: A simple constituent quark model for D meson arXiv:

8 Constituent quark model - Applying it to D meson: a simple example including QCD effect

9 Simple quantum mechanical method – D meson - Start from - Use and minimize - Minimum energy Full Constituent quark model calculation

10 - D meson - B meson - Wave function M=350 MeV M=200 MeV

11 Light quark system - H-q system - q-q system

12 III: Consequences

13 1.D Dbar production on a nuclei ? 2.D meson flow in heavy ion collision 3.Charmonium production in nuclei through anti proton reaction Consequences of change in D meson mass

14 2 nd order Stark Effect Changes in 1 – system SHLee, C.M.Ko PRC67(2003) D Dbar loop effect

15 Anti proton Heavy nuclei Observation of  m through p-A reaction Can be done at J-PARC

16 2.D meson mass will increase in nuclear medium as shown by constituent quark model calculation and QCD sum rules Summary 1. D meson mass encodes important information on chiral symmetry breaking and confinement in QCD 3. D meson production in nuclei 4. Charmonium production using anti proton on a nuclei