Study of dipion transitions among Υ(3S), Υ(2S), and Υ(1S) states

被引：34

作者：

Cronin-Hennessy, D. ^{[1
]}

Gao, K. Y. ^{[1
]}

Hietala, J. ^{[1
]}

Kubota, Y. ^{[1
]}

Klein, T. ^{[1
]}

Lang, B. W. ^{[1
]}

Poling, R. ^{[1
]}

Scott, A. W. ^{[1
]}

Smith, A. ^{[1
]}

Zweber, P. ^{[1
]}

Dobbs, S. ^{[2
]}

Metreveli, Z. ^{[2
]}

Seth, K. K. ^{[2
]}

Tomaradze, A. ^{[2
]}

Ernst, J. ^{[3
]}

Ecklund, K. M. ^{[4
]}

Severini, H. ^{[5
]}

Love, W. ^{[6
]}

Savinov, V. ^{[6
]}

Lopez, A. ^{[7
]}

Mehrabyan, S. ^{[7
]}

Mendez, H. ^{[7
]}

Ramirez, J. ^{[7
]}

Huang, G. S. ^{[8
]}

Miller, D. H. ^{[8
]}

Pavlunin, V. ^{[8
]}

Sanghi, B. ^{[8
]}

Shipsey, I. P. J. ^{[8
]}

Xin, B. ^{[8
]}

Adams, G. S. ^{[9
]}

Anderson, M. ^{[9
]}

Cummings, J. P. ^{[9
]}

Danko, I. ^{[9
]}

Hu, D. ^{[9
]}

Moziak, B. ^{[9
]}

Napolitano, J. ^{[9
]}

He, Q. ^{[10
]}

Insler, J. ^{[10
]}

Muramatsu, H. ^{[10
]}

Park, C. S. ^{[10
]}

Thorndike, E. H. ^{[10
]}

Yang, F. ^{[10
]}

Artuso, M. ^{[11
]}

Blusk, S. ^{[11
]}

Khalil, S. ^{[11
]}

Li, J. ^{[11
]}

Menaa, N. ^{[11
]}

Mountain, R. ^{[11
]}

Nisar, S. ^{[11
]}

Randrianarivony, K. ^{[11
]}

机构：

[1] Univ Minnesota, Minneapolis, MN 55455 USA

[2] Northwestern Univ, Evanston, IL 60208 USA

[3] SUNY Albany, Albany, NY 12222 USA

[4] SUNY Buffalo, Buffalo, NY 14260 USA

[5] Univ Oklahoma, Norman, OK 73019 USA

[6] Univ Pittsburgh, Pittsburgh, PA 15260 USA

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

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

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

[10] Univ Rochester, Rochester, NY 14627 USA

[11] Syracuse Univ, Syracuse, NY 13244 USA

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

[13] CALTECH, Pasadena, CA 91125 USA

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

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

[16] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

[17] Cornell Univ, Ithaca, NY 14853 USA

[18] Univ Florida, Gainesville, FL 32611 USA

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

[20] Univ Illinois, Urbana, IL 61801 USA

[21] Indiana Univ, Bloomington, IN 47405 USA

[22] Univ Kansas, Lawrence, KS 66045 USA

[23] Luther Coll, Decorah, IA 52101 USA

来源：

PHYSICAL REVIEW D | 2007年 / 76卷 / 07期

关键词：

D O I：

10.1103/PhysRevD.76.072001

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present measurements of decay matrix elements for hadronic transitions of the form Upsilon(nS)->Upsilon(mS)pi pi, where (n,m)=(3,1),(2,1),(3,2). We reconstruct charged and neutral pion modes with the final state Upsilon decaying to either mu(+)mu(-) or e(+)e(-). Dalitz plot distributions for the 12 decay modes are fit individually as well as jointly assuming isospin symmetry, thereby measuring the matrix elements of the decay amplitude. We observe and account for the anomaly previously noted in the dipion invariant mass distribution for the Upsilon(3S)->Upsilon(1S)pi pi transition and obtain good descriptions of the dynamics of the decay using the most general decay amplitude allowed by partial conservation of the axial-vector current considerations. The fits further indicate that the Upsilon(2S)->Upsilon(1S)pi pi and Upsilon(3S)->Upsilon(2S)pi pi transitions also show the presence of terms in the decay amplitude that were previously ignored, although at a relatively suppressed level.

引用

页数：16

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