--- UserCode/Friis/TancNote/note/introduction.tex	2010/04/15 23:22:39	1.3
+++ UserCode/Friis/TancNote/note/introduction.tex	2010/04/28 02:59:29	1.7
@@ -1,22 +1,22 @@
 High tau identification performance is important for the discovery potential of
-many possible new physics signals at the Compact Muon Solenoid (CMS).  Events
-with tau leptons are typically signal events; the Standard Model background
-rates with true tau leptons are typically the same order of magnitude as the
-expected signal rate in many searches.  The challenge of doing physics with
-taus is dominated by the rate at which objects are incorrectly tagged as taus.
-In paticular, quark and gluon jets have a significantly higher production
-cross-section and events where these objects are incorrectly identified as tau
-leptons can dominate the backgrounds of searches for new physics using taus.
-Efficient identification of hadronic tau decays and and low misidentification
-rate for quarks and gluons is thus essential to maximize the significance of
-searches for new physics at CMS.
+many possible new physics signals at the Compact Muon Solenoid (CMS).  The
+Standard Model background rates from true tau leptons are typically the same
+order of magnitude as the expected signal rate in many searches for new
+physics.  The challenge of doing physics with taus is driven by the rate at
+which objects are incorrectly tagged as taus.  In particular, quark and gluon
+jets have a significantly higher production cross-section and events where
+these objects are incorrectly identified as tau leptons can dominate the
+backgrounds of searches for new physics using taus.  Efficient identification
+of hadronic tau decays and low misidentification rate for quarks and gluons
+is thus essential to maximize the significance of searches for new physics at
+CMS.
 
-New physics signals may be discovered through tau lepton hadronic decay channels
-in early CMS data.  The tau lepton plays a paticularly important role in
-searches for Higgs bosons.  In the Minimal Supersymmetric Model (MSSM), the
-production cross--section is enhanced by the parameter $\tan\beta$.  The
-coupling of the MSSM Higgs to the tau lepton is also enchaced. \fixme(finish
-this)
+%New physics signals may be discovered through tau lepton hadronic decay channels
+%in early CMS data.  The tau lepton plays a paticularly important role in
+%searches for Higgs bosons.  In the Minimal Supersymmetric Model (MSSM), the
+%production cross--section is enhanced by the parameter $\tan\beta$.  The
+%coupling of the MSSM Higgs to the tau lepton is also enchaced. \fixme(finish
+%this)
 
 %The tau plays a paticularly important role in the search for Higgs
 %boson particle.  In the Standard Model (SM), the Higgs boson couplings to fermions
@@ -31,17 +31,19 @@ Tau leptons are unique in that they are
 enough to decay to hadrons.  The hadronic decays compose approximately 65\% of
 all tau decays, the remainder being split nearly evenly between $\tau^{-}
 \rightarrow \mu^{-} \bar \nu_\mu \nu_\tau$ and $\tau^{-} \rightarrow e^{-} \bar
-\nu_e \nu_\tau$.  The hadronic decays typically decay to one or three charged
+\nu_e \nu_\tau$.  The hadronic decays are typically composed of one or three charged
 pions and zero to two neutral pions.  The neutral pions decay almost
 instantaneously to pairs of photons.
 
 In this note, we will describe a technique to identify hadronic tau decays.  Tau
 decays to electrons and muons are difficult to distinguish from electrons and
 muons produced in $pp$ collisions.  Analyses that use exclusively
-non-hadronically decaying taus typically require that the leptonic ($e,\mu$)
+non--hadronically decaying taus typically require that the leptonic ($e,\mu$)
 decays be of opposite flavor.  The discrimination of hadronic tau decays from
-electrons and muons is described in~\ref{PFT08001}.  With the Tau Neural
-Classifier, we aim to improve the identification of true hadronic tau decays
-associated with a collimated jet containing either one or three tracks
-reconstructed in the pixel and silicon strip tracker, plus a low number of
-neutral electromagnetic showers reconstructed in the calorimeter.
+electrons and muons is described in~\cite{PFT08001}.  With the Tau Neural
+Classifier, we aim to improve the discrimination of true hadronic tau decays
+from quark and gluon jets using a neural network approach.
+
+%associated with a collimated jet containing either one or three tracks
+%reconstructed in the pixel and silicon strip tracker, plus a low number of
+%neutral electromagnetic showers reconstructed in the calorimeter.