Bing An Li

Theory of {tau} mesonic decays

Studies of {tau} mesonic decays are presented. A mechanism for the axial-vector current at low energies is proposed. The VMD is used to treat the vector current. All the meson vertices of both normal parity and abnormal parity (Wess-Zumino-Witten anomaly) are obtained from an effective chiral theory of mesons. a{sub 1} dominance is found in the decay modes of the {tau} lepton: 3{pi}, f(1285){pi}. Both the {rho} and the a{sub 1} meson contribute to the decay {tau}{r_arrow}K{sup {asterisk}}K{nu}; it is found that the vector current is dominant. CVC is tested by studying e{sup +}e{sup {minus}}{r_arrow}{pi}{sup +}{pi}{sup {minus}}. The branching ratios of {tau}{r_arrow}{omega}{pi}{nu} and K{bar K}{nu} are calculated. In terms of a similar mechanism the {Delta}s=1 decay modes of the {tau} lepton are studied and K{sub a} dominance is found in {tau}{r_arrow}K{sup {asterisk}}{pi}{nu} and K{sup {asterisk}}{eta}{nu}. The suppression of {tau}{r_arrow}K{rho}{nu} is revealed. The branching ratio of {tau}{r_arrow}{eta}K{nu} is computed. As a test of this theory, the form factors of {pi}{r_arrow}e{gamma}{nu} and K{r_arrow}e{gamma}{nu} are determined. The theoretical results agree with data reasonably well. {copyright} {ital 1997} {ital The American Physical Society}

Possible 0{sup -+} glueball candidate X(1835)

The possibility of X(1835) discovered by BESII as a 0{sup -+} glueball is studied in this paper. The decay rates of X(1835){yields}pp, VV are associated with the gluon spin contents of proton and vector mesons, respectively. Estimations of the decay rates of X(1835){yields}VV, {gamma}V, {gamma}{gamma} and the cross sections of {gamma}{gamma}{yields}X(1835){yields}f and h{sub 1}+h{sub 2}{yields}X(1835)+... are presented. It predicts that as a glueball X(1835) is unlikely to be produced in J/{psi} hadronic decays but as a pp it is likely.

Electromagnetic mass splittings of π, a 1 , K , K 1 ( 1400 ) , and K * ( 892 )

To one-loop order and

Lattice calculation of glueball matrix elements

O(alpha_{em})

Production of a Q**2 bar Q**2 state in J/psi ---> gamma omega phi

, the electromagnetic mass splittings of

FORM FACTORS OF PION AND KAON

pi

Chiral field theory of 0-+ glueball

,

{tau} mesonic decays and strong anomaly of PCAC

a_1

U(2)_{L}\times U(2)_{R} Chiral Theory of Mesons

,

\Upsilon(1s)-->\gamma(\eta',\eta) decays

K