Evidence for a Narrow Massive State in the Radiative Decays of the Upsilon*
نویسندگان
چکیده
Evidence is presented for a state, which we call <, with a mass M = (8322 f 8 f 24) MeV and a line width < 80 MeV (90% confidence level) using the Crystal Ball NaI(T1) detector at DORIS II. Radiative transitions to this state are observed from about 100,000 Y(1S) decays in two independent sets of data: one in which < --* multiple hadrons, and one which is strongly biased towards < --) 2 low multiplicity jets. The branching ratio to this state from Y(lS) is on the order of 0.5% . Presented at the 12th SLAC Summer Institute on Particle Physics Stanford, California, July 22 August 3, 1984 * Work supported by the Department of Energy, contract DE-AC03-76SFOO515 t Permanent address: Institute of Nuclear Physics, Cracow, Poland. 0 Boguslaw B. Niczyporuk 1984
منابع مشابه
Possibility of Exotic States in the Upsilon system
Recent data from Belle show unusually large partial widths Υ(5S) → Υ(1S)ππ and Υ(5S) → Υ(2S)ππ. The Z(4430) narrow resonance also reported by Belle in ψπ spectrum has the properties expected of a c̄cud̄ charged isovector tetraquark T c̄c . The analogous state T b̄b in the bottom sector might mediate anomalously large cascade decays in the Upsilon system, Υ(mS) → T b̄b π → Υ(nS)ππ, with a tetraquark-...
متن کاملتولید کوارک تاپ منفرد به عنوان قیدی برای بوزونW
The existence of a new massive charged gauge boson, known as W’, is proposed by many new physics scenarios. When W’ decays to tb, the final state is very similar to the final state of the s-channel single top production, where W boson is the off-shell mediator to produce the top and bottom quarks. If W’ exists, it can affect the cross section of the SM s-channel single top production, so measur...
متن کاملUpsilon Decays
Bound upsilon states and their decays provide a unique laboratory for testing QCD, LQCD, and quarkonium potential models. I review recent results, some of which are significant improvements in precision over previous measurements and others are first-time observations. While most of the results presented are from CLEO III there are also notable contributions from BaBar and Belle who have just b...
متن کاملEffect of Thermal Conductivity and Emissivity of Solid Walls on Time-Dependent Turbulent Conjugate Convective-Radiative Heat Transfer
In the present study, the conjugate turbulent free convection with the thermal surface radiation in a rectangular enclosure bounded by walls with different thermophysical characteristics in the presence of a local heater is numerically studied. The effects of surface emissivity and wall materials on the air flow and the heat transfer characteristics are the main focus of the present investigati...
متن کاملStudies of Three-Body B^+→D ̅^* 〖(2007)〗^0 K^+ K ̅^0 and B^0→D^* 〖(2010)〗^- K^+ K ̅^0 Decays
We analyze three-body decays of and . Under the factorization approach, there are tree level diagrams for these decay modes and the transition matrix element of decay is factorized into a form factor multiplied by decay constant and form factor multiplied into weak vertices form factor. The transition matrix element of decay is also factorized into a form factor multiplied into weak vertic...
متن کامل