arXiv subjects

The NOMAD Collaboration

Publications and source records attributed to The NOMAD Collaboration.

3 recordsLinked to original sources

arXiv2001

A study of backward going $p$ and $π^{-}$ in $ν_μCC$ interactions with the NOMAD detector

Backward proton and $π^-$ production has been studied in $ν_μCC$ interactions with carbon nuclei. Detailed analyses of the momentum distributions, of the production rates, and of the general features of events with a backward going particle, have been carried out in order to understand the mechanism producing these particles. The backward proton data have been compared with the predictions of the reinteraction and the short range correlation models.

hep-ex↗

arXiv2001

Measurement of the Antilambda Polarization in nu_mu Charged Current Interactions in the NOMAD Experiment

We present a measurement of the polarization of Antilambda hyperons produced in nu_mu charged current interactions. The full data sample from the NOMAD experiment has been analyzed using the same V0 identification procedure and analysis method reported in a previous paper for the case of Lambda hyperons. The Antilambda polarization has been measured for the first time in a neutrino experiment. The polarization vector is found to be compatible with zero.

hep-ex↗

arXiv1998

Search for a new gauge boson in $π^{0}$ decays

A search was made for a new light gauge boson $X$ which might be produced in $π^{0}\toγ+ X$ decay from neutral pions generated by 450-GeV protons in the CERN SPS neutrino target. The X's would penetrate the downstream shielding and be observed in the NOMAD detector via the Primakoff effect, in the process of $X \toπ^{0}$ conversion in the external Coulomb field of a nucleus. With $1.45\times10^{18}$ protons on target, 20 candidate events with energy between 8 and 140 GeV were found from the analysis of neutrino data. This number is in agreement with the expectation of 18.1$\pm$2.8 background events from standard neutrino processes. A new 90% C.L. upper limit on the branching ratio $Br(π^{0}\toγ+ X)< (3.3 to 1.9) \times10^{-5}$ for $X$ masses ranging from 0 to 120 MeV/c^2 is obtained.

hep-ex↗