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--- physics:crosssections [2018/08/17 23:37] – [CMS samples] iwn
+++ physics:crosssections [2018/08/27 14:07] (current) – [Cross sections at CMS] iwn
@@ Line 1: / Line 1: @@
-====== Cross sections ======
+====== Cross sections at CMS ======
+This page aims to collect information about **cross sections** that are relevant for CMS. More on **luminosity** can be found [[physics:lumi|here]], and more on **PDFs** can be found [[physics:pdfs|here]] instead.
 ===== CMS samples =====
@@ Line 8: / Line 8: @@
   * [[https://cms-gen-dev.cern.ch/xsdb|cross section database (XSDB) for CMS samples]], e.g. for [[https://cms-gen-dev.cern.ch/xsdb/?columns=67108863&currentPage=0&pageSize=10&searchQuery=DAS%3DDYJetsToLL_M-.%2A50_Tune|Drell-Yan]]
   * [[https://twiki.cern.ch/twiki/bin/view/CMS/SummaryTable1G25ns|summary table for 2016 samples]]
-  * [[https://twiki.cern.ch/twiki/bin/view/CMS/TauIDMeasurementsHelp#2017_measurements_MC2017_v2_samp|summary table for 2017 samples]]
+  * [[https://twiki.cern.ch/twiki/bin/view/CMS/TauIDMeasurementsHelp#2017_measurements_MC2017_v2_samp|summary table for 2017 samples]], [[https://ineuteli.web.cern.ch/ineuteli/crosssections/2017/|cross-check]]
-  * calculate for samples with [[https://twiki.cern.ch/twiki/bin/view/CMS/HowToGenXSecAnalyzer| GenXSecAnalyzer]], see [[physics:crosssections:GenXSecAnalyzer|this example of useage]]
+  * calculate for samples with [[https://twiki.cern.ch/twiki/bin/view/CMS/HowToGenXSecAnalyzer| GenXSecAnalyzer]] (CMSSW), see [[physics:crosssections:GenXSecAnalyzer|this example of useage]]
 ===== Predicted from theory =====
@@ Line 16: / Line 16: @@
   * [[https://twiki.cern.ch/twiki/bin/viewauth/CMS/StandardModelCrossSectionsat13TeV|13 TeV summary (CMS TWiki)]]
-  * [[https://twiki.cern.ch/twiki/bin/view/LHCPhysics/TtbarNNLO|top quark pair production (NNLO+NNLL, CMS TWiki)]] with [[http://pdg.lbl.gov/2017/tables/rpp2017-sum-gauge-higgs-bosons.pdf|W boson branching fractions]], such that:<code>
+  * [[https://twiki.cern.ch/twiki/bin/view/LHCPhysics/TtbarNNLO|top quark pair production (NNLO+NNLL, CMS TWiki)]] with [[http://pdg.lbl.gov/2017/tables/rpp2017-sum-gauge-higgs-bosons.pdf|W boson branching fractions (PDG 2017)]], such that:<code>
-TTTo2L2Nu:        BR(dilep) = 10.3%       831.76 pb * (3*0.1086)^2        = 88.2877 pb
+TTTo2L2Nu:        BR(dilep)   = 10.6%       831.76 pb * (3*0.1086)^2        =  88.2877 pb
-TTToHadronic:     BR(dilep) = 43.5%   =>  831.76 pb * (2*3*0.1086*0.6741) = 365.3452 pb
+TTToHadronic:     BR(had)     = 45.4%   =>  831.76 pb * (0.6741)^2          = 377.9607 pb
-TTToSemiLeptonic: BR(dilep) = 46.2%       831.76 pb * (0.6741)^2          = 377.9607 pb
+TTToSemiLeptonic: BR(semilep) = 43.9%       831.76 pb * (2*3*0.1086*0.6741) = 365.3452 pb
 </code>
   * [[https://twiki.cern.ch/twiki/bin/view/LHCPhysics/SingleTopRefXsec|single top production (5FS NLO, CMS TWiki)]]
@@ Line 58: / Line 58: @@
 </WRAP>
 </WRAP>
+===== Measured =====
+  * [[https://twiki.cern.ch/twiki/bin/view/CMSPublic/PhysicsResultsCombined|summary of measurements at CMS]]
+  * top pair production measurements at CMS: [[https://twiki.cern.ch/twiki/bin/view/CMSPublic/PhysicsResultsTOPSummaryFigures|summary]]
@@ Line 67: / Line 74: @@
 {{ cross_sections_summary_-_cms.png }}
-\\ \\
+\\
 Summaries of cross sections by James Stirling are found here:
 http://www.hep.ph.ic.ac.uk/~wstirlin/plots/plots.html

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