Improve Calibration section

Author: rovere

CaloParticles/.caloParticles.md.swp

@@ -2,9 +2,14 @@
 
 For a more detailed explanation, please read [this
 document](https://twiki.cern.ch/twiki/pub/CMS/HGCALSimulationAndPerformance/CalibratedRechits.pdf)
-Lot's of useful information can also be found at [this
+Lots of useful information can also be found at [this
 link](https://indico.cern.ch/event/508120/contributions/2028680/attachments/1244672/1832373/HGCal_calibRecHit_16Mar16.pdf#search=arabella%20calibration).
 
+> **[info] Info**
+> For further information, especially related to the TDR geometry that is being
+delivered in July 2018, refer to [this
+talk](https://indico.cern.ch/event/740826/contributions/3058501/attachments/1678687/2696151/CalibratedRecHits.pdf).
+
 The rechits coming out the detector electronics have a magnitude measured in
 **femtoCoulomb** (**fC**) corresponding to the energy desposited in the active
 thickness of the Si sensor cells. The calibration procedure will start from
@@ -16,7 +21,7 @@ calibration procedure:
    thicknesses (3 constants)
 
 1. Equalization of the signal scale to account for the differing absorber
-   thicknesses in the 40 layers of the EE and FH (40 constants)
+   thicknesses in the 52 layers of HGCAL (52 constants)
 
 1. Setting the overall scale such that when the signals in a shower are added,
    their sum is a good estimate of the energy of the incoming particle which
@@ -42,6 +47,12 @@ convert it into *average number of MIPs*, where the conversion factor is the
 most probable value of the Landau distribution for a MIP in Si, computed for the
 3 different sensors thickness.
 
+The following figure, taken from the PDG document linked in the
+[reading](#reading) section, helps understanding the situation better:
+
+![Bethe-Block and MPV value from Landau/Vavilov/Bichsel](EnergyLoss_MPV_Landau.png)
+![Most probable energy loss, scaled to the mean loss of a MIP in Silicon](MPV_dEdx_min_Si.png)
+
 Currently (june 2018, 22:55:15 (UTC+0200)) the **fCperMIP** values are:
 
 | Si Thickness [$$\mu\textrm{m}$$] | fCperMIP [$$\textrm{fC}$$] |
@@ -213,12 +224,27 @@ The output of this module is a collection of `PFClusters` that will have the
 calibration applied**.
 
 
+## Configuration files {#config}
+
+* [Uncalibrated RecHits](https://github.com/cms-sw/cmssw/blob/master/RecoLocalCalo/HGCalRecProducers/python/HGCalUncalibRecHit_cfi.py)
+* [Calibrated RecHits](https://github.com/cms-sw/cmssw/blob/master/RecoLocalCalo/HGCalRecProducers/python/HGCalRecHit_cfi.py)
+* [PFCluster Calibration](https://github.com/cms-sw/cmssw/blob/master/RecoParticleFlow/PFClusterProducer/python/particleFlowRealisticSimClusterHGCCalibrations_cfi.py)
+
 
 # Useful numbers {#usefulnumbers}
 
+* The density of Silicon is 2.328 $$\textrm{g}/\textrm{cm}^3$$
+* The value of $$\frac{\textrm{dE}}{\textrm{dx}}\rvert_{\textrm{min}}$$ is 1.664
+$$\textrm{MeV} \textrm{g}^{-1} \textrm{cm}^2$$, i.e., 3.88
+$$\textrm{MeV}/\textrm{cm}$$ (i.e. $$388 \textrm{eV}/\mu\textrm{m}$$)
+* Energy required to create an e-h in Silicon is $$3.62 \textrm{eV}$$
 * Typically, for $$300 \mu\textrm{m}$$ thick Si sensor, a MIP will deposit the
   equivalent of $$73 e^-/\mu\textrm{m}$$
 * Hence, for an orthogonally incident MIP particle, we will measure a charge
   deposit of $$73\times300 e^-$$, i.e. $$\sim 22K e^- \Rightarrow \sim 3.5E^{-15}
   \textrm{C} = 3.5 \textrm{fC}$$, to be compared with the quoted value of
   $$3.88$$ listed in the table above.
+
+# Further Reading {#reading}
+
+* PDG: [Passage of particles through matter](http://pdg.lbl.gov/2017/reviews/rpp2017-rev-passage-particles-matter.pdf)

HitCalibration/EnergyLoss_MPV_Landau.png

@@ -11,7 +11,9 @@
       * [Uncalibrated RecHits](HitCalibration/hitCalibration.md#uncalib)
       * [Calibrated RecHits](HitCalibration/hitCalibration.md#calib)
       * [Final Energy scale](HitCalibration/hitCalibration.md#finalenergy)
+      * [Configuration Files](HitCalibration/hitCalibration.md#config)
    * [Useful Numbers](HitCalibration/hitCalibration.md#usefulnumbers)
+   * [Further Reading](HitCalibration/hitCalibration.md#reading)
 * [CaloParticles](CaloParticles/caloParticles.md)
    * [Introduction](CaloParticles/caloParticles.md#intro)
       * [Definitions](CaloParticles/caloParticles.md#defs)

HitCalibration/MPV_dEdx_min_Si.png

@@ -233,6 +233,19 @@
 
 
 
+        </li>
+    
+        <li class="chapter " data-level="1.2.2.4" data-path="../HitCalibration/hitCalibration.html">
+            
+                <a href="../HitCalibration/hitCalibration.html#config">
+            
+                    
+                    Configuration Files
+            
+                </a>
+            
+
+            
         </li>
 
 
@@ -251,6 +264,19 @@
 
 
 
+        </li>
+    
+        <li class="chapter " data-level="1.2.4" data-path="../HitCalibration/hitCalibration.html">
+            
+                <a href="../HitCalibration/hitCalibration.html#reading">
+            
+                    
+                    Further Reading
+            
+                </a>
+            
+
+            
         </li>
 
 
@@ -678,7 +704,7 @@ <h1 class="search-results-title">No results matching "<span class='search-query'
 
 
 
-                <a href="../HitCalibration/hitCalibration.html#usefulnumbers" class="navigation navigation-prev " aria-label="Previous page: Useful Numbers">
+                <a href="../HitCalibration/hitCalibration.html#reading" class="navigation navigation-prev " aria-label="Previous page: Further Reading">
                     <i class="fa fa-angle-left"></i>
                 </a>
 
@@ -694,7 +720,7 @@ <h1 class="search-results-title">No results matching "<span class='search-query'
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