A study of ν µ-induced charged current (CC) π+ production at the T2K off -axis near detector
(ND280) is presented. Using Monte Carlo (MC) data studies event selections for
both CC-inclusive and enriched CC- π+ samples have been developed using the ND280
tracker-region and surrounding ECals. Two types of CC- π+ selections were developed - one using the TPC to identify the pion and the other using a new ECal PID based on the
deposited charge per unit length. Data/MC ratios are calculated and compared with the
associated detector, neutrino interaction and
flux simulation systematics.
The predicted neutrino interaction rate was based on v2.6.2 of the GENIE MC generator
and on T2Ks tuned 11a JNUBEAM
flux simulation. The data used was collected between
Nov. 2010 and March 2011 during the Run 2 data taking period and corresponds to a
total integrated POT of 7.83 x 10[to the power of 19]. For the ν µ-CC-Inclusive selection which selects ν µ -CC
interactions with a purity of 88:1% we find:
[Mathematical formulae appear here. To view, please open pdf attachment]
These show that the current measured and predicted rates for both the inclusive rate of ν µ
neutrino interactions and those with at least one π+ in the final state agree to within the
systematic uncertainties associated with neutrino interaction and
flux simulation. Moreover,
these selections lay the groundwork for future analyses, using larger data sets, that
can be used to constrain these sources of uncertainty.