Observation of a near-threshold enhancement in the pp̄ mass spectrum from radiative J/ψ → γpp̄ decays

Physical Review Letters

Volumn 91, Issue 2, 2003, Pages

  Bai, J Z ^a   Ban, Y ⁱ   Bian, J G ^a   Cai, X ^a   Chang, J F ^a   Chen, H F ^p   Chen, H S ^a   Chen, J ^c   Chen, Jie ^h   Chen, J C ^a   Chen, Y B ^a   Chi, S P ^a   Chu, Y P ^a   Cui, X Z ^a   Dai, Y M ^g   Dai, Y S ^s   Dong, L Y ^a   Du, S X ^r   Du, Z Z ^a   Dunwoodie, W ^m   Fang, J ^a   Fang, S S ^a   Fu, C D ^a   Fu, H Y ^a   Fu, L P ^f   Gao, C S ^a   Gao, M L ^a   Gao, Y N ⁿ   Gong, M Y ^a   Gong, W X ^a   Gu, S D ^a   Guo, Y N ^a   Guo, Y Q ^a   Guo, Z J ^b   Han, S W ^a   Harris, F A ^o   He, J ^a   He, K L ^a   He, M ^j   He, X ^a   Heng, Y K ^a   Hong, T ^a   Hu, H M ^a   Hu, T ^a   Huang, G S ^a   Huang, L ^f   Huang, X P ^a   Izen, J M ^q   Ji, X B ^a   Jiang, C H ^a   Jiang, X S ^a   Jin, D P ^a   Jin, S ^a   Jin, Y ^a   Jones, B D ^q   Ke, Z J ^a   Kong, D ^o   Lai, Y F ^a   Li, F ^a   Li, G ^a   Li, H H ^e   Li, J ^a   Li, J C ^a   Li, K ^f   Li, Q J ^a   Li, R B ^a   Li, R Y ^a   Li, W ^a   Li, W G ^a   Li, X Q ^h   Li, X S ⁿ   Liu, C F ^r   Liu, C X ^a   Liu, Fang ^p   Liu, F ^e   Liu, H M ^a   Liu, J B ^a   Liu, J P ^r   Liu, R G ^a   Liu, Y ^a   Liu, Z A ^a   Liu, Z X ^a   Lou, X C ^q   Lu, G R ^d   Lu, F ^a   Lu, H J ^p   Lu, J G ^a   Lu, Z J ^a   Luo, X L ^a   Ma, E C ^a   Ma, F C ^g   Ma, J M ^a   Malchow, R ^c   Mao, Z P ^a   Meng, X C ^a   Mo, X H ^b   Nie, J ^a   Nie, Z D ^a   Olsen, S L ^o   Paluselli, D ^o   Peng, H P ^p   Qi, N D ^a   Qian, C D ^k   Qiu, J F ^a   Rong, G ^a   Shen, D L ^a   Shen, H ^a   Shen, X Y ^a   Sheng, H Y ^a   Shi, F ^a   Song, L W ^a   Sun, H S ^a   Sun, S S ^p   Sun, Y Z ^a   Sun, Z J ^a   Tang, S Q ^a   Tang, X ^a   Tian, D ^a   Tian, Y R ⁿ   Toki, W ^c   Tong, G L ^a   Varner, G S ^o   Wang, J ^a   Wang, J Z ^a   Wang, L ^a   Wang, L S ^a   Wang, M ^a   Wang, Meng ^a   Wang, P ^a   Wang, P L ^a   Wang, W F ^a   Wang, Y F ^a   Wang, Zhe ^a   Wang, Z ^a   Wang, Zheng ^a   Wang, Z Y ^b   Wei, C L ^a   Wu, N ^a   Xia, X M ^a   Xie, X X ^a   Xu, G F ^a   Xu, Y ^a   Xue, S T ^a   Yan, M L ^p   Yan, W B ^a   Yang, G A ^a   Yang, H X ⁿ   Yang, J ^p   Yang, S D ^a   Ye, M H ^b   Ye, Y X ^p   Ying, J ⁱ   Yu, C S ^a   Yu, G W ^a   Yuan, C Z ^a   Yuan, J M ^a   Yuan, Y ^a   Yue, Q ^a   Zang, S L ^a   Zeng, Y ^f   Zhang, B X ^a   Zhang, B Y ^a   Zhang, C C ^a   Zhang, D H ^a   Zhang, H Y ^a   Zhang, J ^a   Zhang, J M ^d   Zhang, J W ^a   Zhang, L S ^a   Zhang, Q J ^a   Zhang, S Q ^a   Zhang, X Y ^j   Zhang, Y J ⁱ   Zhang, Yiyun ^l   Zhang, Y Y ^a   Zhang, Z P ^p   Zhao, D X ^a   Zhao, Jiawei ^p   Zhao, J W ^a   Zhao, P P ^a   Zhao, W R ^a   Zhao, Y B ^a   Zhao, Z G ^a,t   Zheng, J P ^a   Zheng, L S ^a   Zheng, Z P ^a   Zhong, X C ^a   Zhou, B Q ^a   Zhou, G M ^a   Zhou, L ^a   Zhou, N F ^a   Zhu, K J ^a   Zhu, Q M ^a   Zhu, Yingchun ^a   Zhu, Y C ^a   Zhu, Y S ^a   Zhu, Z A ^a   Zhuang, B A ^a   Zou, B S ^a   more..

^a INSTITUTE OF HIGH ENERGY PHYSICS   (China)

^b CCAST WORLD LABORATORY   (China)

^c Department of Environmental and Radiological Health Sciences   (United States)

^d HENAN NORMAL UNIVERSITY   (China)

^e CENTRAL CHINA NORMAL UNIVERSITY   (China)

^f HUNAN UNIVERSITY   (China)

^g LIAONING UNIVERSITY   (China)

^h NANKAI UNIVERSITY   (China)

ⁱ PEKING UNIVERSITY   (China)

^j SHANDONG UNIVERSITY   (China)

^k SHANGHAI JIAO TONG UNIVERSITY   (China)

^l SICHUAN UNIVERSITY   (China)

^m SLAC NATIONAL ACCELERATOR LABORATORY   (United States)

ⁿ TSINGHUA UNIVERSITY   (China)

^o UNIVERSITY OF HAWAII   (United States)

^p UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA   (China)

^q UNIVERSITY OF TEXAS AT DALLAS   (United States)

^r WUHAN UNIVERSITY   (China)

^s ZHEJIANG UNIVERSITY   (China)

^t UNIVERSITY OF MICHIGAN   (United States)

more..

Author keywords

[No Author keywords available]

Indexed keywords

BARREL SHOWER COUNTER; BEIJING ELECTRON POSITRON COLLIDER; CYLINDRICAL DRIFT CHAMBER; MASS SPECTRUM; MUONS; NEAR THRESHOLD ENHANCEMENT; SOLID ANGLE MAGNETIC SPECTROMETER;

COLLIDING BEAM ACCELERATORS; DECOMPOSITION; ELECTRON RESONANCE; IONIZATION; MAGNETS; MASS SPECTROMETRY; PROTONS; RADIATION;

CHARGED PARTICLES;

EID: 79961019261     PISSN: 00319007     EISSN: None     Source Type: Journal    
DOI: None     Document Type: Article

References (21)

1. FENICE Collaboration, A. Antonelli et al., Nucl. Phys. B517, 3 (1998).
2. G. Bardin et al., Nucl. Phys. B411, 3 (1994).
3. D. Bridges et al., Phys. Lett. B 180, 313 (1986).
4. O. D. Dalkarov et al., Phys. Lett. B 392, 229 (1997).
5. E. Fermi and C. N. Yang, Phys. Rev. 76, 1739 (1949).
6. Y. Nambu and G. Jona-Lasinio, Phys. Rev. 122, 345 (1961)
7. Y. Nambu and G. Jona-Lasinio, Phys. Rev. 124, 246 (1961).
8. R. Delbourgo and M. D. Scadron, Phys. Rev. Lett. 48, 379 (1982)
9. T. Hatsuda and T. Kunihiro, Prog. Theor. Phys. 74, 765 (1985)
10. T. Hatsuda and T. Kunihiro, Phys. Rep. 247, 221 (1994).
11. For recent reviews of this subject, see E. Klempt et al., Phys. Rep. 368, 119 (2002)
12. J.-M. Richard, Nucl. Phys. B (Proc. Suppl.) 86, 361 (2000).
13. Belle Collaboration, K. Abe et al., Phys. Rev. Lett. 88, 181803 (2002).
14. Belle Collaboration, K. Abe et al., Phys. Rev. Lett. 89, 151802 (2002).
15. BES Collaboration, J. Z. Bai et al., Nucl. Instrum. Methods Phys. Res., Sect. A 458, 627 (2001).
16. BES Collaboration, J. Z. Bai et al., Phys. Lett. B 555, 174 (2003).
17. p is substantial, even for Γ = 0.
18. 2 at higher masses. Convolving the fitting function with a Gaussian with a width in this range has no significant effect on the results.
19. 0pp feedthrough predicted by the MC. This indicates that there is some contribution from nonresonant three-body J/ψ → γpp decays.
20. Particle Data Group, D. Groom et al., Eur. Phys. J. C 15, 1 (2000).
21. 2/d.o.f. = 10.3/7.