First observation of the exclusive decays Λc+→Λπ+π+π-π0 and Λc+→Λωπ+ -: art. no. 012001

被引：6

作者：

Cronin-Hennessy, D

Lyon, AL

Park, CS

Park, W

Thayer, JB

Thorndike, EH

Coan, TE

Gao, YS

Liu, F

Maravin, Y

Stroynowski, R

Artuso, M

Boulahouache, C

Blusk, S

Bukin, K

Dambasuren, E

Mountain, R

Moneti, GC

Muramatsu, H

Nandakumar, R

Skwarnicki, T

Stone, S

Wang, JC

Mahmood, AH

Csorna, SE

Danko, I

Bonvicini, G

Cinabro, D

Dubrovin, M

McGee, S

Bornheim, A

Lipeles, E

Pappas, SP

Shapiro, A

Sun, WM

Weinstein, AJ

Briere, RA

Chen, GP

Ferguson, T

Tatishvili, G

Vogel, H

Adam, NE

Alexander, JP

Berkelman, K

Boisvert, V

Cassel, DG

Drell, PS

Duboscq, JE

Ecklund, KM

Ehrlich, R

机构：

[1] Univ Rochester, Rochester, NY 14627 USA

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

[3] Syracuse Univ, Syracuse, NY 13244 USA

[4] Univ Texas Pan Amer, Edinburg, TX 78539 USA

[5] Vanderbilt Univ, Nashville, TN 37235 USA

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

[7] CALTECH, Pasadena, CA 91125 USA

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

[9] Cornell Univ, Ithaca, NY 14853 USA

[10] Univ Florida, Gainesville, FL 32611 USA

[11] Univ Illinois, Urbana, IL 61801 USA

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

[13] Inst Particle Phys, Toronto, ON M5S 1A7, Canada

[14] Univ Kansas, Lawrence, KS 66045 USA

[15] Univ Minnesota, Minneapolis, MN 55455 USA

[16] Northwestern Univ, Evanston, IL 60208 USA

[17] SUNY Albany, Albany, NY 12222 USA

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

[19] Univ Oklahoma, Norman, OK 73019 USA

[20] Univ Pittsburgh, Pittsburgh, PA 15260 USA

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

来源：

PHYSICAL REVIEW D | 2003年 / 67卷 / 01期

关键词：

D O I：

10.1103/PhysRevD.67.012001

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using data collected by the CLEO III detector at CESR, we report on the first observation of the decays Lambda(c)(+)-->Lambdapi(+)pi(+)pi(-)pi(0) and Lambda(c)(+)-->Lambdaomegapi(+). The branching fractions are measured relative to the pK(-)pi(+) mode; we find B(Lambda(c)(+)-->Lambdapi(+)pi(+)pi(-)pi(0))/B(Lambda(c)(+)-->pK(-)pi(+))=0.36+/-0.09(stat)+/-0.09(syst) and B(Lambda(c)(+)-->Lambdaomegapi(+))/B(Lambda(c)(+)-->pK(-)pi(+))=0.24+/-0.06(stat)+/-0.06(syst). We also observe a small excess of events in Lambda(c)(+)-->Lambdaetapi(+), eta-->pi(+)pi(-)pi(0) from which we find B(Lambda(c)(+)-->Lambdaetapi(+))/B(Lambda(c)(+)-->pK(-)pi(+))=0.41+/-0.17+/-0.10 with a corresponding limit of <0.65% at 90% confidence level. This rate is consistent with previous measurements of Lambda(c)(+)-->Lambdaetapi(+), eta-->gammagamma. We find that the combined branching fractions for Lambda(c)(+)-->Lambdaomegapi(+) and Lambda(c)(+)-->Lambdaetapi(+) comprise (87+/-13)% of the total Lambda(c)(+)-->Lambdapi(+)pi(+)pi(-)pi(0) rate. We set an upper limit on B(Lambda(c)(+)-->Lambdapi(+)pi(+)pi(-)pi(0))/B(Lambda(c)(+)-->pK(-)pi(+)) for non-omega and non-eta modes of 0.13 at 90% confidence level.

引用

页数：7

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