Claudio CIOFI degli ATTI DIFFRACTION on NUCLEI ... - QNP2012
Claudio CIOFI degli ATTI DIFFRACTION on NUCLEI ... - QNP2012
Claudio CIOFI degli ATTI DIFFRACTION on NUCLEI ... - QNP2012
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4.1 The number of inelastic collisi<strong>on</strong>s in hA scattering<br />
In order to know the absolute value of a hard nuclear cross secti<strong>on</strong>,<br />
the measured fracti<strong>on</strong> of the total number of inelastic events<br />
is normalized as follows<br />
Nhard hA /NhA in<br />
R hard<br />
A/N =<br />
σhA in N hA<br />
hard<br />
A σ hN<br />
in<br />
N hN<br />
hard<br />
hard<br />
Nhard<br />
hN<br />
= 1 N hA<br />
N coll<br />
, N coll = A σhN in<br />
σin<br />
hA<br />
The number of hard collisi<strong>on</strong>s at a given impact parameter should<br />
be defined as follows<br />
R hard<br />
A/N (b) =<br />
N hA<br />
hard (b)<br />
n coll (b) N hN<br />
hard<br />
n coll (b) = σhN in<br />
T A(b)<br />
P in (b)<br />
and P in (b) = 1 − exp[−σin<br />
NNT<br />
A h b] is the probability for an inelastic interacti<strong>on</strong><br />
to occur at impact parameter b; it is affected by both SRC<br />
and IS through TA h(b):<br />
C. Ciofi <str<strong>on</strong>g>degli</str<strong>on</strong>g> Atti<br />
17 <strong>QNP2012</strong>, Palaiseau, April 16-20, 2012
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