Studies of Charmonium at BESIII

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Studies of Charmonium at BESIII 郑波南华大学核科学技术学院（For the BESIII Collaboration）第12届全国粒子物理大会· 中国科技大学 · 2016.8.22-26

Outline Production and decay mechanism of charmonium: Gee of J/y, y(3686) and X(3872) the intrinsic nature of the resonance, ISR technique Baryonic pair and other decay of J/y, y(3686) 12% rule Radiative decay of y(3770) non-DD decay of y(3770) , stringent test of the various theoretical approaches Radiative decay of hc Knowledge of P-wave spin-singlet hc rather sparse, h-h’ mixing Decays of ccJ test QCD-based calculations

BESIII The physics goals of BESIII : Light hadron spectroscopy, charm physics, τ physics, charmonium physics, R value … J/y data y(3686) data BESIII 1310 M 448 M BESII 58 M 14 M CLEO-c -- 26 M 3.773 GeV data pb-1

Gee measurement Method: ISR technique PLB 749:441(2015) 3.773 GeV 4.009 GeV 4.260 GeV 4.230 GeV 4.360 GeV Method: ISR technique

Comparisons of Gee for J/y Gee(J/y)*Bmm (eV) Gee(J/y) (keV) Reference BESIII 334.4±2.5±4.4 5.58±0.05±0.08 Arxiv:1604.01924 BaBar 330.1±7.7±7.3 5.61±0.20 PRD 69 011103R CLEO 338.4±5.8±7.1 5.68±0.11±0.13 PRD 73 051103R Comparisons of Gee for y(3686) Gee(y(3686)) (keV) Reference BESIII 2.213±0.018±0.099 PLB 749 414(2015) BESII 2.338±0.037±0.096 PLB 659 74(2008) 2.330±0.036±0.110 PRL 97 121801(2006) 2.44±0.21 PLB 550 24 (2002) RVUE 2.14±0.21 NPB 320 45(1989)

yX+ X-, S(1385)+S(1385)- Reconstruct one baryonic resonant PRD 93:072003 (2016) Reconstruct one baryonic resonant

Value (%) 26.73±0.50±2.30 7.76±0.55±0.68 6.88±0.40±0.50 Not in agree with 12% rule!

y(3686)K-LX++c.c. PRD 91:092006 (2015) 4.9 s 6.2 s

y(3686)gK-LX++c.c. PRD 91:092006 (2015)

y(3686)wK+K- PRD 89:112006 (2014) Neglect the interference between ψ(3686) decay and continuum production

y(3770)gccJ PRD 91:092009 (2015) PLB 753:103(2016)

Search for y(3770)ghc(nS) PRD 89:112005 (2014)

Observation of hcgh(’) PRL 116:251802 (2016) 447M y(3686) data y(3686)p0hc tag Search for new hc decays modes

ccJfK*(892)K PRD 91:112008 (2015) 106 M y(3686) data

K*± K*0 More data and PWA analysis method is needed ! h1(1380) f(1680) f(1850) K*± K*0 More data and PWA analysis method is needed !

Summary Expected more results later! Precise measurements: Gee of J/y, y(3686) and X(3872) J/y X+ X-, S(1385)±S(1385)± y(3770)gccJ ccJ  fK*(892)K First measurement or observations: hc  gh(’) y(3770)ghc(nS) y(3686) X+ X-, S(1385)±S(1385)± y(3686)(g)K-LX++c.c. Expected more results later!

Thank you!