Search for a low mass particle decaying into µ+ µ- in B0 â K*0 X and B0 â ρ0 X at Belle.
Phys Rev Lett
; 105(9): 091801, 2010 Aug 27.
Article
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| MEDLINE
| ID: mdl-20868151
ABSTRACT
We search for dimuon decays of a low mass particle in the decays B0âK*0 X and B0âρ0 X using a data sample of 657×10(6)BB events collected with the Belle detector at the KEKB asymmetric-energy e+ e- collider. We find no evidence for such a particle in the mass range from 212 MeV/c2 to 300 MeV/c2 for lifetimes below 10(-12) s, and set upper limits on its branching fractions. In particular, we search for a particle with a mass of 214.3 MeV/c2 reported by the HyperCP experiment, and obtain upper limits on the products B(B0âK*0 X)×B(Xâµ+ µ- )<2.26(2.27)×10(-8) and B(B0âρ0 X)×B(Xâµ+ µ-)<1.73(1.73)×10(-8) at 90% C.L. for a scalar (vector) X particle.
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01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Nanopartículas
/
Modelos Químicos
/
Física Nuclear
Idioma:
En
Revista:
Phys Rev Lett
Año:
2010
Tipo del documento:
Article