Experimental constraints on the spin and parity of the Λc(2880)+

被引：67

作者：

Mizuk, R. ^{[1
]}

Abe, K.

Adachi, I.

Aihara, H.

Anipko, D.

Aulchenko, V.

Aushev, T.

Bakich, A. M.

Balagura, V.

Barberio, E.

Bay, A.

Bedny, I.

Belous, K.

Bitenc, U.

Bizjak, I.

Blyth, S.

Bondar, A.

Bozek, A.

Bracko, M.

Brodzicka, J.

Browder, T. E.

Chang, M.-C.

Chen, A.

Chen, K.-F.

Chen, W. T.

Cheon, B. G.

Chistov, R.

Choi, Y.

Choi, Y. K.

Cole, S.

Dalseno, J.

Danilov, M.

Drutskoy, A.

Eidelman, S.

Epifanov, D.

Fratina, S.

Gabyshev, N.

Garmash, A.

Gershon, T.

Gokhroo, G.

Golob, B.

Ha, H.

Haba, J.

Hayasaka, K.

Hayashii, H.

Hazumi, M.

Heffernan, D.

Hokuue, T.

Hoshi, Y.

Hou, S.

机构：

[1] Inst Theoret & Expt Phys, Moscow 117259, Russia

[2] Budker Inst Nucl Phys, Novosibirsk 630090, Russia

[3] Univ Cincinnati, Cincinnati, OH 45221 USA

[4] Fu Jen Catholic Univ, Dept Phys, Taipei, Taiwan

[5] Grad Univ Adv Studies, Hayama, Japan

[6] Hanyang Univ, Seoul 133791, South Korea

[7] Univ Hawaii, Honolulu, HI 96822 USA

[8] High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki, Japan

[9] Univ Illinois, Urbana, IL 61801 USA

[10] Chinese Acad Sci, Inst High Energy Phys, Beijing, Peoples R China

[11] Inst High Energy Phys, Vienna, Austria

[12] Inst High Energy Phys, Protvino, Russia

[13] Jozef Stefan Inst, Ljubljana, Slovenia

[14] Kanagawa Univ, Yokohama, Kanagawa, Japan

[15] Kyungpook Natl Univ, Taegu 702701, South Korea

[16] Ecole Polytech Fed Lausanne, Swiss Fed Inst Technol, CH-1015 Lausanne, Switzerland

[17] Univ Ljubljana, Ljubljana, Slovenia

[18] Univ Maribor, SLO-2000 Maribor, Slovenia

[19] Univ Melbourne, Parkville, Vic 3052, Australia

[20] Nagoya Univ, Nagoya, Aichi, Japan

[21] Korea Univ, Seoul 136701, South Korea

[22] Nara Womens Univ, Nara 630, Japan

[23] Natl Cent Univ, Chungli 32054, Taiwan

[24] Natl United Univ, Miaoli, Taiwan

[25] Natl Taiwan Univ, Dept Phys, Taipei, Taiwan

[26] H Niewodniczanski Inst Nucl Phys, PL-31342 Krakow, Poland

[27] Nippon Dent Univ, Niigata, Japan

[28] Niigata Univ, Niigata, Japan

[29] Univ Nova Gorica, Nova Gorica, Slovenia

[30] Osaka Univ, Osaka, Japan

[31] Panjab Univ, Chandigarh 160014, India

[32] Peking Univ, Beijing 100871, Peoples R China

[33] Osaka City Univ, Osaka 558, Japan

[34] Princeton Univ, Princeton, NJ 08544 USA

[35] RIKEN BNL Res Ctr, Upton, NY 11973 USA

[36] Univ Sci & Technol China, Hefei 230026, Peoples R China

[37] Seoul Natl Univ, Seoul, South Korea

[38] Shinshu Univ, Nagano, Japan

[39] Sungkyunkwan Univ, Suwon, South Korea

[40] Univ Sydney, Sydney, NSW 2006, Australia

[41] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India

[42] Toho Univ, Funabashi, Chiba 274, Japan

[43] Tohoku Gakuin Univ, Tagajo, Miyagi, Japan

[44] Tohoku Univ, Sendai, Miyagi 980, Japan

[45] Univ Tokyo, Dept Phys, Tokyo 113, Japan

[46] Tokyo Metropolitan Univ, Tokyo 158, Japan

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

[48] Yonsei Univ, Seoul 120749, South Korea

[49] Tokyo Inst Technol, Tokyo 152, Japan

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 26期

关键词：

D O I：

10.1103/PhysRevLett.98.262001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the results of several studies of the Lambda(+)(c)pi(+)pi X- final state in continuum e(+)e(-) annihilation data collected by the Belle detector. An analysis of angular distributions in Lambda(c)(2880)(+)->Sigma(c)(2455)(0,++)pi(+,-) decays strongly favors a Lambda(c)(2880)(+) spin assignment of 5/ over 3/2 or 1/2. We find evidence for Lambda(c)(2880)(+)->Sigma(c)(2520)(0,++)pi(+,-) decay and measure the ratio of Lambda(c)(2880)(+) partial widths Gamma(Sigma(c)(2520)pi)/Gamma(Sigma(c)(2455)pi)=0.225 +/- 0.062 +/- 0.025. This value favors the Lambda(c)(2880)(+) spin-parity assignment of 5/2(+) over 5/2(-). We also report the first observation of Lambda(c)(2940)(+)->Sigma(c)(2455)(0,++)pi(+,-) decay and measure Lambda(c)(2880)(+) and Lambda(c)(2940)(+) mass and width parameters. These studies are based on a 553 fb(-1) data sample collected at or near the Upsilon(4S) resonance at the KEKB collider.

引用

页数：6

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