How we improve the cross section measurement or how we Improve the analysis of MA. You measure (E m , q m , E had ) and reconstruct E n. If the flux is known to a few %, then the cross section can be measured:. Then, Q 2 distribution is plotted.
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Improve the analysis of MA
You measure (Em, qm, Ehad) and reconstruct En.
Then, Q2 distribution is plotted.
before we have a perfect cross section measurement.
But, how do we parametrize?
1. Vector form factors can be measured. N(e,e’),N(e,e’p)
2. Nuclear effects can be measured. N(e,e’),N(e,e’p)
To determine neutrino cross section, we need good pion cross
Section, namely good flux measurement. HARP,E910,MIPP
What are the systematic errors?
Overall normalization error?
Shape (spectrum) error? These two must be separated.
It is important to estimate the spectrum error, ie, energy dependent
errors (spectrum errors) are given. s(Pp, qp)
Unless you have confidence in your flux shape, flux dependent an alaysis
Should be avoided.
Flux error is 10-20%.Ds=DMA.
Statistical error in MA from shape analysis is +-3%.
Shape is not a simple dipole.
Nuclear effects are large in the low Q2 region, where the cross section is large.
En=1.3 GeV，kF=220 MeV/c
W/o Pauli effect
W/ Pauli effect
If P <kF , suppressed.
At low Q2
Total 3% reduction