We reanalyse the LSND neutrino oscillation results in the framework of the projected quasiparticle random phase approximation (PQRPA), which is the only RPA model that treats the Pauli principle ...correctly, and accounts satisfactorily for great majority of the weak decay observables around C12. We have found that the employment of the PQRPA inclusive DIF C12(νe,e−)N12 cross-section, instead of the CRPA used by the LSND Collaboration in the νμ→νe oscillations study of the 1993–1995 data sample, leads to the following: (1) the oscillation probability is increased from (0.26±0.10±0.05)% to (0.33±0.10±0.13)%, and (2) the previously found consistence between the (sin22θ,Δm2) confidence level regions for the νμ→νe and the ν¯μ→ν¯e oscillations is significantly diminished. These effects are not due to the difference in the uncertainty ranges for the neutrino–nucleus cross-section, but to the difference in the cross-sections themselves.
The xi0 muon semileptonic decay has been observed for the first time with nine identified events using the KTeV beam line and detector at Fermilab. The decay is normalized to the xi0 beta decay mode ...and yields a value for the ratio of decay rates gamma(xi0 --> sigma+ mu- nu(mu))/gamma(xi0 --> sigma+ e- nu(e)) of 1.8(-0.5)(+0.7)(stat) +/- 0.2(syst) x 10(-2). This is in agreement with the SU(3) flavor symmetric quark model.
Large extra dimensions and reactor antineutrino anomaly Machado, P A N; Nunokawa, H; dos Santos, F A Pereira ...
Journal of physics. Conference series,
07/2012, Letnik:
375, Številka:
4
Journal Article, Conference Proceeding
Recenzirano
Odprti dostop
We present an alternative explanation to the reactor antineutrino anomaly through neutrino oscillation induced by the presence of a large flat extra dimension with a size in the sub-micrometer range. ...We also show that the solution is consistent with the other existing oscillation data.
We observe a signal for the doubly charmed baryon Xi(+)(cc) in the charged decay mode Xi(+)(cc)-->Lambda(+)(c)K-pi(+) in data from SELEX, the charm hadroproduction experiment at Fermilab. We observe ...an excess of 15.9 events over an expected background of 6.1+/-0.5 events, a statistical significance of 6.3sigma. The observed mass of this state is 3519+/-1 MeV/c(2). The Gaussian mass width of this state is 3 MeV/c(2), consistent with resolution; its lifetime is less than 33 fs at 90% confidence.
Search for the Rare Decay K L → π 0 e + e Alavi-Harati, A.; Alexopoulos, T.; Arenton, M. ...
Physical review letters,
7/2004, Letnik:
93, Številka:
2
Journal Article
This Letter is the first report of the K{L}-->pi{+/-}e{-/+}nue{+}e{-} decay. Based on 19 208+/-144 events, we determine the branching fraction, B(K{L}-->pi{+/-}e{-/+}nue{+}e{-}M_{e{+}e{-}}>5 ...MeV/c{2},E{e{+}e{-}}{*}>30 MeV)=(1.285+/-0.041)x10{-5}, and Gamma(K{e3ee}M{e{+}e{-}}>5 MeV/c{2})/Gamma(K{e3})=4.57+/-0.04(stat)+/-0.14(syst)x10{-5}. This ratio agrees with a theoretical prediction based on chiral perturbation theory (ChPT) calculated to O(p{4}). The measured kinematical distributions agree with those predicted by just ChPT O(p{4}), but show significant disagreement with ones predicted by leading-order ChPT.
The KTeV/E799 experiment at Fermilab has searched for the rare kaon decay K(L)-->pi(0)e(+)e(-). This mode is expected to have a significant CP violating component. The measurement of its branching ...ratio could support the standard model or could indicate the existence of new physics. This Letter reports new results from the 1999-2000 data set. One event is observed with an expected background at 0.99+/-0.35 events. We set a limit on the branching ratio of 3.5x10(-10) at the 90% confidence level. Combining with the previous result based on the data set taken in 1997 yields the final KTeV result: BR(K(L)-->pi(0)e(+)e(-))<2.8x10(-10) at 90% C.L.
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