Higher-order multipole amplitudes in charmonium radiative transitions

被引：23

作者：

Artuso, M. ^{[1
]}

Blusk, S. ^{[1
]}

Khalil, S. ^{[1
]}

Mountain, R. ^{[1
]}

Randrianarivony, K. ^{[1
]}

Skwarnicki, T. ^{[1
]}

Stone, S. ^{[1
]}

Wang, J. C. ^{[1
]}

Zhang, L. M. ^{[1
]}

Bonvicini, G. ^{[2
]}

Cinabro, D. ^{[2
]}

Lincoln, A. ^{[2
]}

Smith, M. J. ^{[2
]}

Zhou, P. ^{[2
]}

Zhu, J. ^{[2
]}

Naik, P. ^{[3
]}

Rademacker, J. ^{[3
]}

Asner, D. M. ^{[4
]}

Edwards, K. W. ^{[4
]}

Reed, J. ^{[4
]}

Robichaud, A. N. ^{[4
]}

Tatishvili, G. ^{[4
]}

White, E. J. ^{[4
]}

Briere, R. A. ^{[5
]}

Vogel, H. ^{[5
]}

Onyisi, P. U. E. ^{[6
]}

Rosner, J. L. ^{[6
]}

Alexander, J. P. ^{[7
]}

Cassel, D. G. ^{[7
]}

Ehrlich, R. ^{[7
]}

Fields, L. ^{[7
]}

Galik, R. S. ^{[7
]}

Gibbons, L. ^{[7
]}

Gray, S. W. ^{[7
]}

Hartill, D. L. ^{[7
]}

Heltsley, B. K. ^{[7
]}

Hunt, J. M. ^{[7
]}

Kreinick, D. L. ^{[7
]}

Kuznetsov, V. E. ^{[7
]}

Ledoux, J. ^{[7
]}

Mahlke-Krueger, H. ^{[7
]}

Patterson, J. R. ^{[7
]}

Peterson, D. ^{[7
]}

Riley, D. ^{[7
]}

Ryd, A. ^{[7
]}

Sadoff, A. J. ^{[7
]}

Shi, X. ^{[7
]}

Stroiney, S. ^{[7
]}

Sun, W. M. ^{[7
]}

Yelton, J. ^{[8
]}

机构：

[1] Syracuse Univ, Syracuse, NY 13244 USA

[2] Wayne State Univ, Detroit, MI 48202 USA

[3] Univ Bristol, Bristol BS8 1TL, Avon, England

[4] Carleton Univ, Ottawa, ON K1S 5B6, Canada

[5] Carnegie Mellon Univ, Pittsburgh, PA 15213 USA

[6] Univ Chicago, Chicago, IL 60637 USA

[7] Cornell Univ, Ithaca, NY 14853 USA

[8] Univ Florida, Gainesville, FL 32611 USA

[9] George Mason Univ, Fairfax, VA 22030 USA

[10] Univ Illinois, Urbana, IL 61801 USA

[11] Indiana Univ, Bloomington, IN 47405 USA

[12] Univ Kansas, Lawrence, KS 66045 USA

[13] Luther Coll, Decorah, IA 52101 USA

[14] Univ Minnesota, Minneapolis, MN 55455 USA

[15] Northwestern Univ, Evanston, IL 60208 USA

[16] Univ Oxford, Oxford OX1 3RH, England

[17] Univ Puerto Rico, Mayaguez, PR 00681 USA

[18] Purdue Univ, W Lafayette, IN 47907 USA

[19] Rensselaer Polytech Inst, Troy, NY 12180 USA

[20] Rice Univ, Houston, TX 77005 USA

[21] Univ Rochester, Rochester, NY 14627 USA

来源：

PHYSICAL REVIEW D | 2009年 / 80卷 / 11期

基金：

美国国家科学基金会;

关键词：

ANGULAR-DISTRIBUTIONS; PHYSICS;

D O I：

10.1103/PhysRevD.80.112003

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using 24x10(6) Sigma(')equivalent to Sigma(2S) decays in CLEO-c, we have searched for higher multipole admixtures in electric-dipole-dominated radiative transitions in charmonia. We find good agreement between our data and theoretical predictions for magnetic quadrupole (M2) amplitudes in the transitions Sigma(')->gamma chi(c1,c2) and chi(c1,c2)->gamma J/Sigma, in striking contrast to some previous measurements. Let b(2)(J) and a(2)(J) denote the normalized M2 amplitudes in the respective aforementioned decays, where the superscript J refers to the angular momentum of the chi(cJ). By performing unbinned maximum likelihood fits to full five-parameter angular distributions, we found the following values of M2 admixtures for J(chi)=1: a(2)(J=1)=(-6.26 +/- 0.63 +/- 0.24)x10(-2) and b(2)(J=1)=(2.76 +/- 0.73 +/- 0.23)x10(-2), which agree well with theoretical expectations for a vanishing anomalous magnetic moment of the charm quark. For J(chi)=2, if we fix the electric octupole (E3) amplitudes to zero as theory predicts for transitions between charmonium S states and P states, we find a(2)(J=2)=(-9.3 +/- 1.6 +/- 0.3)x10(-2) and b(2)(J=2)=(1.0 +/- 1.3 +/- 0.3)x10(-2). If we allow for E3 amplitudes we find, with a four-parameter fit, a(2)(J=2)=(-7.9 +/- 1.9 +/- 0.3)x10(-2), b(2)(J=2)=(0.2 +/- 1.4 +/- 0.4)x10(-2), a(3)(J=2)=(1.7 +/- 1.4 +/- 0.3)x10(-2), and b(3)(J=2)=(-0.8 +/- 1.2 +/- 0.2)x10(-2). We determine the ratios a(2)(J=1)/a(2)(J=2)=0.67(-0.13)(+0.19) and a(2)(J=1)/b(2)(J=1)=-2.27(-0.99)(+0.57), where the theoretical predictions are independent of the charmed quark magnetic moment and are a(2)(J=1)/a(2)(J=2)=0.676 +/- 0.071 and a(2)(J=1)/b(2)(J=1)=-2.27 +/- 0.16.

引用

页数：16

共 37 条

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