Properties of the hadronic system resulting fromν¯μpinteractions

Abstract

The properties of the final-state hadronic system in antineutrino-proton charged-current interactions a r e presented. The events were observed in the Fermilab 15-foot hydrogen bubble chamber. The average energy of the events i s -30 GeV, but there a r e some interactions beyond 100 GeV. The mean multiplicity of the charged hadrons varies a s ( n : ) = (0.06*0.06)+ ( 1 . 2 2 i 0 . 0 3 ) l n~~ for hadronic masses W in the range l . 0 < 7V2< 50 &v2. By contrast, the multiplicity depends only weakly on the four-momentum transfer between the leptons. The mean pion multiplicities for events with three o r more charged tracks a r e found to be (n-) =1.64*0.04, (no) =1.16+0.13, for s' and no production, respectively. By comparing the number of positive tracks with T' data from neutrino production, we deduce a mean proton multiplicity (n,,) of 0.5310.15. The single-particle distributions in both longitudinal and transverse momentum a r e found to be similar to those for nondiffractive production in hadronic collisions. The fragmentation properties of the final-state d quarks a r e compared to the expectations of the quark-parton model. The fraction of observed neutral-strange-particle production for events with three o r more charged tracks i s 0.08 i 0 . 0 1 5 and i s consistent with coming completely from associated production.

Measurement of the inclusiveνμcharged current cross section on carbon in the near detector of the T2K experiment

“…Below 2 GeV/c 2 , NEUT uses a W -dependent function to determine the pion multiplicity in each interaction. The mean multiplicity of charged pions is estimated from data collected in the Fermilab 15-foot bubble chamber experiment [32]. In both generators, Koba-Nielsen-Olesen (KNO) scaling [33] is used to determine the charged hadron multiplicity.…”

Measurement of electron neutrino appearance with the MINOS experiment

“…Due to the lack of external data constraining some aspects of the hadron shower model, Figure 3.18: Nucleon p 2 T distribution data from Derrick et al [57] (left) and nucleon x F distribution data from Cooper et al [58] (right). The AGKY parameterization (solid line) and the 1σ variation on its free parameters (shaded area) are shown for both distributions.…”

Mean charged multiplicities in charged-current neutrino scattering on hydrogen and deuterium

“…The mean charged-hadron multiplicity in the muon neutrino and antineutrino charged-current reactions on hydrogen and deuterium has been measured in the Fermilab experiments E31 [14][15][16][17][18][19][20], E45 [21][22][23][24], and E545 [25][26][27] with the 15 ft bubble chamber and in the CERN experiments WA21 [28][29][30][31][32][33][34] and WA25 [35][36][37][38][39] with the Big European Bubble Chamber (BEBC). The data obtained with the Fermi National Accelerator Laboratory (FNAL) and BNL hydrogen bubble chambers before 1976 are gathered in Ref.…”

“…Table I summarizes the results of Refs. [14][15][16][20][21][22][23][26][27][28][29][30][32][33][34][35][36][37], represented in terms of the intercept and slope coefficients a and b of Eq. (1).…”

“…Namely, we include in the statistical analysis the data from Refs. [16,22,27,34,39] and acceptable subsamples of data from Refs. [30,33,37].…”