<s>
In	O
experimental	O
particle	O
physics	O
,	O
a	O
calorimeter	B-Algorithm
is	O
a	O
type	O
of	O
detector	O
that	O
measures	O
the	O
energy	O
of	O
particles	O
.	O
</s>
<s>
Particles	O
enter	O
the	O
calorimeter	B-Algorithm
and	O
initiate	O
a	O
particle	O
shower	O
in	O
which	O
their	O
energy	O
is	O
deposited	O
in	O
the	O
calorimeter	B-Algorithm
,	O
collected	O
,	O
and	O
measured	O
.	O
</s>
<s>
Typically	O
,	O
calorimeters	B-Algorithm
are	O
segmented	O
transversely	O
to	O
provide	O
information	O
about	O
the	O
direction	O
of	O
the	O
particle	O
or	O
particles	O
,	O
as	O
well	O
as	O
the	O
energy	O
deposited	O
,	O
and	O
longitudinal	O
segmentation	O
can	O
provide	O
information	O
about	O
the	O
identity	O
of	O
the	O
particle	O
based	O
on	O
the	O
shape	O
of	O
the	O
shower	O
as	O
it	O
develops	O
.	O
</s>
<s>
Calorimeters	B-Algorithm
are	O
characterized	O
by	O
the	O
radiation	O
length	O
(	O
ECAL	O
)	O
and	O
nuclear	O
interaction	O
length	O
(	O
HCAL	O
)	O
of	O
their	O
active	O
material	O
.	O
</s>
<s>
An	O
ECAL	O
or	O
an	O
HCAL	O
can	O
be	O
either	O
a	O
sampling	O
calorimeter	B-Algorithm
or	O
a	O
homogeneous	O
calorimeter	B-Algorithm
.	O
</s>
<s>
Most	O
particle	B-Algorithm
physics	I-Algorithm
experiments	I-Algorithm
use	O
some	O
form	O
of	O
calorimetry	O
.	O
</s>
<s>
In	O
addition	O
,	O
calorimeters	B-Algorithm
are	O
necessary	O
for	O
calculating	O
"	O
missing	O
energy	O
"	O
which	O
can	O
be	O
attributed	O
to	O
particles	O
that	O
rarely	O
interact	O
with	O
matter	O
and	O
escape	O
the	O
detector	O
,	O
such	O
as	O
neutrinos	O
.	O
</s>
<s>
In	O
most	O
experiments	O
the	O
calorimeter	B-Algorithm
works	O
in	O
conjunction	O
with	O
other	O
components	O
like	O
a	O
central	O
tracker	O
and	O
a	O
muon	O
detector	O
.	O
</s>
