Evidence for e~+e~-→γχ_(c1,2) at center-of-mass energies from 4.009 to 4.360 GeV
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摘要
Using data samples collected at center-of-mass energies of √s=4.009, 4.230, 4.260, and 4.360 Ge V with the BES detector operating at the BEPC collider, we perform a search for the process e+e-→γχc J(J =0, 1, 2)and find evidence for e+e-→γχc1 and e+e-→γχc2 with statistical significances of 3.0σ and 3.4σ, respectively. The Born cross sections σB(e+e-→γχc J), as well as their upper limits at the 90% confidence level(C.L.) are determined at each center-of-mass energy.
Using data samples collected at center-of-mass energies of √s=4.009, 4.230, 4.260, and 4.360 Ge V with the BES detector operating at the BEPC collider, we perform a search for the process e+e-→γχc J(J =0, 1, 2)and find evidence for e+e-→γχc1 and e+e-→γχc2 with statistical significances of 3.0σ and 3.4σ, respectively. The Born cross sections σB(e+e-→γχc J), as well as their upper limits at the 90% confidence level(C.L.) are determined at each center-of-mass energy.
Using data samples collected at center-of-mass energies of √s=4.009, 4.230, 4.260, and 4.360 Ge V with the BES detector operating at the BEPC collider, we perform a search for the process e+e-→γχc J(J =0, 1, 2)and find evidence for e+e-→γχc1 and e+e-→γχc2 with statistical significances of 3.0σ and 3.4σ, respectively. The Born cross sections σB(e+e-→γχc J), as well as their upper limits at the 90% confidence level(C.L.) are determined at each center-of-mass energy.
引文
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2 HE Q et al.(CLEO collaboration).Phys.Rev.D,2006,74:091104(R)
3 YUAN C Z et al.(Belle collaboration).Phys.Rev.Lett.,2007,99:182004
4 Lees J P et al.(BABAR collaboration).Phys.Rev.D,2012,86:051102
5 LIU Z Q et al.(Belle collaboration).Phys.Rev.Lett.,2013,110:252002
6 Eichten E,Gottfried K,Kinoshita T,Lane K,YAN T.Phys.Rev.D,1978,17:3090;1980,21:203;Barnes T,Godfrey S,Swanson E S.Phys.Rev.D,2005,72:054026
7 LIU L et al.(Hadron Spectrum collaboration).JHEP,2012,1207:126
8 Ebert D,Faustov R N,Galkin V O.Phys.Lett.B,2006,634:214
9 Maiani L,Riquer V,Piccinini F,Polosa A D.Phys.Rev.D,2005,72:031502(R)
10 LIU X,ZENG X Q,LI X Q.Phys.Rev.D,2005,72:054023(R)
11 YUAN C Z,WANG P,MO X H.Phys.Lett.B,2006,634:399
12 WANG X L et al.(Belle collaboration).Phys.Rev.D,2013,87 :051101(R)
13 Coan T E et al.(CLEO collaboration).Phys.Rev.Lett.,2006,96 :162003
14 Ablikim M et al.(BES collaboration).Phys.Rev.Lett.,2014,112:092001
15 MA L,SUN Z F,LIU X H,DENG W Z,LIU X,ZHU S L.Phys.Rev.D,2014,90:034020
16 CHAO K T,HE Z G,LI D,MENG C.hep-ex/ar Xiv:1310.8597
17 Ablikim M et al.(BES collaboration).Nucl.Instrum.Methods A,2010,614:345
18 Agostinelli S et al.(GEANT4 collaboration).Nucl.Instrum.Methods A,2003,506:250
19 Lange D J.Nucl.Instrum.Methods A,2001,462:152;PING R G.HEP&NP,2008,32:599602
20 Jadach S,Ward B F L,Was Z.Comput.Phys.Commum.,2000,130 :260;Jadach S,Ward B F L,Was Z.Phys.Rev.D,2001,63:113009
21 Olive K A et al.(Particle Data Group).Chin.Phys.C,2014,38:090001
22 Beringer J et al.(Particle Data Group).Phys.Rev.D,2012,86:010001
23 PING R G.Chinese Phys.C,2008,32:599
24 Sjostrand T,Lonnblad L,Mrenna S.hep-ph/0108264
25 Kuraev E A,Fadin V S.Sov.J.Nucl.Phys.,1985,41:466[Yad.Fiz.1985,41:733]
26 Actis S et al.Eur.Phys.J.C,2010,66:585
27 Ablikim M et al.(BES collaboration).Phys.Rev.D,2012,86:071101
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