Limit on the production of a new vector boson in e+e-→Uγ, U→π+π-with the KLOE experiment
- Anastasi A.
- Babusci D.
- Bencivenni G.
- Berlowski M.
- Bloise C.
- Bossi F.
- Branchini P.
- Budano A.
- Caldeira Balkestahl L.
- Cao B.
- Ceradini F.
- Ciambrone P.
- Curciarello F.
- Czerwinski E.
- D'Agostini G.
- Dane E.
- De Leo V.
- De Lucia E.
- De Santis A.
- De Simone P.
- Di Cicco A.
- Di Domenico A.
- Di Salvo R.
- Domenici D.
- D'Uffizi A.
- Fantini A.
- Felici G.
- Fiore S.
- Gajos A.
- Gauzzi P.
- Giardina G.
- Giovannella S.
- Graziani E.
- Happacher F.
- Heijkenskjold L.
- Ikegami Andersson W.
- Johansson T.
- Kaminska D.
- Krzemien W.
- Kupsc A.
- LOFFREDO, SALVATORE
- Mandaglio G.
- MARTINI, MATTEO
- MASCOLO, MATTEO
- Messi R.
- Miscetti S.
- Morello G.
- Moricciani D.
- Moskal P.
- Palladino A.
- Papenbrock M.
- Passeri A.
- Patera V.
- Perez del Rio E.
- Ranieri A.
- Santangelo P.
- SARRA, IVANO
- Schioppa M.
- Silarski M.
- Sirghi F.
- TORTORA, LUCA
- Venanzoni G.
- Wislicki W.
- Wolke M.
DOIAbstract
The recent interest in a light gauge boson in the framework of an extra U(1) symmetry motivates searches in the mass range below 1 GeV. We present a search for such a particle, the dark photon, in e(+)e(-) -> U gamma, U -> pi(+)pi(-) based on 28 million e(+)e(-) -> pi(+)pi(-) gamma events collected at DA Phi NE by the KLOE experiment. The pi(+) pi(-) production by initial-state radiation compensates for a loss of sensitivity of previous KLOE U -> e(+) e(-), mu(+) mu(-) searches due to the small branching ratios in the rho-omega resonance region. We found no evidence for a signal and set a limit at 90% CL on the mixing strength between the photon and the dark photon, epsilon(2), in the U mass range between 527 and 987 MeV. Above ...
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