- Main
Study of hadronic transitions between Υ states and observation of Υ(4S)→ηΥ(1S) decay
- Aubert, B;
- Bona, M;
- Karyotakis, Y;
- Lees, JP;
- Poireau, V;
- Prencipe, E;
- Prudent, X;
- Tisserand, V;
- Tico, JG;
- Grauges, E;
- Lopez, L;
- Palano, A;
- Pappagallo, M;
- Eigen, G;
- Stugu, B;
- Sun, L;
- Abrams, GS;
- Battaglia, M;
- Brown, DN;
- Cahn, RN;
- Jacobsen, RG;
- Kerth, LT;
- Kolomensky, YG;
- Kukartsev, G;
- Lynch, G;
- Osipenkov, IL;
- Ronan, MT;
- Tackmann, K;
- Tanabe, T;
- Hawkes, CM;
- Soni, N;
- Watson, AT;
- Koch, H;
- Schroeder, T;
- Walker, D;
- Asgeirsson, DJ;
- Fulsom, BG;
- Hearty, C;
- Mattison, TS;
- McKenna, JA;
- Barrett, M;
- Khan, A;
- Teodorescu, L;
- Blinov, VE;
- Bukin, AD;
- Buzykaev, AR;
- Druzhinin, VP;
- Golubev, VB;
- Onuchin, AP;
- Serednyakov, SI;
- Skovpen, YI;
- Solodov, EP;
- Todyshev, KY;
- Bondioli, M;
- Curry, S;
- Eschrich, I;
- Kirkby, D;
- Lankford, AJ;
- Lund, P;
- Mandelkern, M;
- Martin, EC;
- Stoker, DP;
- Abachi, S;
- Buchanan, C;
- Gary, JW;
- Liu, F;
- Long, O;
- Shen, BC;
- Vitug, GM;
- Yasin, Z;
- Zhang, L;
- Sharma, V;
- Campagnari, C;
- Hong, TM;
- Kovalskyi, D;
- Mazur, MA;
- Richman, JD;
- Beck, TW;
- Eisner, AM;
- Flacco, CJ;
- Heusch, CA;
- Kroseberg, J;
- Lockman, WS;
- Schalk, T;
- Schumm, BA;
- Seiden, A;
- Wang, L;
- Wilson, MG;
- Winstrom, LO;
- Cheng, CH;
- Doll, DA;
- Echenard, B;
- Fang, F;
- Hitlin, DG;
- Narsky, I;
- Piatenko, T;
- Porter, FC;
- Andreassen, R;
- Mancinelli, G;
- Meadows, BT
- et al.
Abstract
We present a study of hadronic transitions between Υ(mS) (m=4, 3, 2) and Υ(nS) (n=2, 1) resonances based on 347.5fb-1 of data taken with the BABAR detector at the PEP-II storage rings. We report the first observation of Υ(4S)→ηΥ(1S) decay with a branching fraction B(Υ(4S)→ηΥ(1S))=(1.96±0.06stat±0.09syst) ×10-4 and measure the ratio of partial widths Γ(Υ(4S) →ηΥ(1S))/Γ(Υ(4S)→π+π-Υ(1S))=2. 41±0.40stat±0.12syst. We set 90% CL upper limits on the ratios Γ(Υ(2S)→ηΥ(1S))/Γ(Υ(2S)→π+π- Υ(1S))<5.2×10-3 and Γ(Υ(3S)→ηΥ(1S))/ Γ(Υ(3S)→π+π-Υ(1S))<1.9×10-2. We also present new measurements of the ratios Γ(Υ(4S)→π+π-Υ(2S))/ Γ(Υ(4S)→π+π-Υ(1S))=1.16±0.16stat±0. 14syst and Γ(Υ(3S)→π+π-Υ(2S))/Γ(Υ(3S) →π+π-Υ(1S))=0.577±0.026stat±0.060syst. © 2008 The American Physical Society.
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