報(bào)告題目：恒元物理學(xué)講座（第105期）： Are there multi-quark hadrons?

報(bào) 告 人：鄭海揚(yáng) 特聘研究員（臺(tái)灣中央研究院物理所）

報(bào)告時(shí)間： 16:00

報(bào)告地點(diǎn)：長(zhǎng)安校區(qū) 物理學(xué)與信息技術(shù)學(xué)院六層學(xué)術(shù)報(bào)告廳（致知樓3623）

主辦單位：物理學(xué)與信息技術(shù)學(xué)院

報(bào)告人簡(jiǎn)介：

鄭海揚(yáng)教授，臺(tái)灣中央研究院特聘研院?jiǎn)T。1980年美國(guó)普渡大學(xué) (Purdue University)博士，80年代中期先后在Brandeis University, Indiana University 等地展開研究工作。 1988年任臺(tái)灣中央研究院物理所研究員，2012年至今任特聘研究員。鄭教授常年與SUNY at Stony Brook, Brookhaven National Lab有合作訪問(wèn)關(guān)系。鄭教授曾組織 25屆國(guó)際高能會(huì)議 （XXV ICHEP，1990）的CP 分會(huì)；擔(dān)任 Chinese Journal of Physics 編輯、主編；擔(dān)任臺(tái)灣國(guó)科會(huì)自然處物理學(xué)門審議委員、臺(tái)灣國(guó)科會(huì)自然處咨議委員；曾擔(dān)任臺(tái)灣高能實(shí)驗(yàn)籌委會(huì)主席；中研院物理所副所長(zhǎng)。鄭教授獲得的榮譽(yù)有G.W. Tautfest Memorial Award (Purdue University), Chester Davis Fellowship (Indiana University), 獲國(guó)科會(huì)杰出獎(jiǎng)（多次），臺(tái)灣物理學(xué)會(huì)會(huì)士，APS 杰出審稿人等。

報(bào)告摘要：

The quark model has been applied very successfully in describing the mesons and baryons and their properties. It is known that all the established mesons are made of a quark and an antiquark, while baryons are composed of three quarks. In principle, hadrons composed with more than three valence quarks are not prohibited by the fundamental theory of strong interactions, namely the so-called QCD. In this talk I'll examine the status of the multi-quark hadrons, including tetraquark mesons, pentquark baryons and hexaquark mesons. We also explain why the quark model often encounters a great challenge in understanding scalar mesons.