| 日時: |
2008-09-26 15:00 - 16:00 |
| 場所: |
研究本館３階321室 |
| 会議名: |
QCD sum rule analyses of charmonia in medium and charmonium-like exotics |
| 連絡先: |
津田 |
| 講演者: |
森田 健司 (Yonsei University, Korea) |
| 講演言語: |
英語 |
| アブストラクト: |
In this seminar, I will talk about two topics:
1. Properties of heavy quarkonia near Tc
Heavy quarkonia in medium have been extensively studied as they can play a key role in understanding confinement-deconfinement transition. Recently we investigate the properties of 1S and 1P charmonia at finite temperature using QCD sum rules with temperature dependent gluon condensates extracted from lattice QCD. In this talk, I will show that the charmonia exhibit critical changes of mass and width across the confinement-deconfinement transition and discuss possible phenomenological consequences.
2. Width of charmonium-like exotics
Recently many charmonium like resonances have been found in Belle experiments. QCD sum rules have been used to study these resonances with interpolating currents assuming theses states as molecules as well as tetraquarks. In previous analyses, effect of width was neglected, while experimental data shows some of resonances have width which might be non-neglible. Especially, the firstly observed charged state of such resonances, Z(4430), has a width around 40 MeV and recently observed Z2(4250) has it around 100 MeV. In this talk, I will discuss how incorporating width affects the sum rule description of these state based on previously obtained OPE both for tetraquarks and molecules.
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