Measurement of the mass splittings between the b(b)over-barχb,J(1P) states -: art. no. 032003

被引：10

作者：

Edwards, KW ^{[1
]}

Bellerive, A

Janicek, R

MacFarlane, DB

Patel, PM

Sadoff, AJ

Ammar, R

Baringer, P

Bean, A

Besson, D

Coppage, D

Darling, C

Davis, R

Kotov, S

Kravchenko, I

Kwak, N

Zhou, L

Anderson, S

Kubota, Y

Lee, SJ

O'Neill, JJ

Poling, R

Riehle, T

Smith, A

Alam, MS

Athar, SB

Ling, Z

Mahmood, AH

Timm, S

Wappler, F

Anastassov, A

Duboscq, JE

Fujino, D

Gan, KK

Hart, T

Honscheid, K

Kagan, H

Kass, R

Lee, J

Schwarthoff, H

Spencer, MB

Sung, M

Undrus, A

Wolf, A

Zoeller, MM

Richichi, SJ

Severini, H

Skubic, P

Bishai, M

Fast, J

机构：

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

[2] Inst Particle Phys, Ottawa, ON, Canada

[3] McGill Univ, Montreal, PQ H3A 2T8, Canada

[4] Ithaca Coll, Ithaca, NY 14850 USA

[5] Univ Kansas, Lawrence, KS 66045 USA

[6] Univ Minnesota, Minneapolis, MN 55455 USA

[7] SUNY Albany, Albany, NY 12222 USA

[8] Ohio State Univ, Columbus, OH 43210 USA

[9] Univ Oklahoma, Norman, OK 73019 USA

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

[11] Univ Rochester, Rochester, NY 14627 USA

[12] Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA

[13] So Methodist Univ, Dallas, TX 75275 USA

[14] Syracuse Univ, Syracuse, NY 13244 USA

[15] Vanderbilt Univ, Nashville, TN 37235 USA

[16] Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA

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

[18] CALTECH, Pasadena, CA 91125 USA

[19] Univ Calif San Diego, La Jolla, CA 92093 USA

[20] Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA

[21] Univ Colorado, Boulder, CO 80309 USA

[22] Cornell Univ, Ithaca, NY 14853 USA

[23] Univ Florida, Gainesville, FL 32611 USA

[24] Harvard Univ, Cambridge, MA 02138 USA

[25] Univ Hawaii Manoa, Honolulu, HI 96822 USA

[26] Univ Illinois, Urbana, IL 61801 USA

[27] Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA

[28] BINP, RU-630090 Novosibirsk, Russia

[29] Yonsei Univ, Seoul 120749, South Korea

[30] Brookhaven Natl Lab, Upton, NY 11973 USA

[31] Univ Texas, Austin, TX 78712 USA

来源：

PHYSICAL REVIEW D | 1999年 / 59卷 / 03期

关键词：

D O I：

10.1103/PhysRevD.59.032003

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present new measurements of photon energies and branching fractions for the radiative transitions Y(2S) --> gamma chi(b(J=0,1,2))(1P). The masses of the chi(b) states are determined from the measured radiative photon energies. The ratio of mass splittings between the chi(b) substates, r=(M-J=2-M-J=1)/(M-J=1 - M-J=0), with M the chi(b) mass, provides information on the nature of the b (b) over bar confining potential. We find r(1P)=0.542 +/- 0.022+/-0.024. This value is somewhat lower than the previous world average, but more consistent with the theoretical expectation that r(1P)< r(2P); i.e., that this mass splitting ratio is smaller for the chi(b)(1P) States than for the chi(b)(2P) states. [S0556-2821(99)02903-3].

引用

页码：1 / 5

页数：5

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