B2PPbarTauNu < Main

Main Web>TWikiUsers>MarkElliotSmith>B2PpbarMunu>B2PPbarTauNu (2019-11-26, RyanNewcombe) (raw view)
<span style="color: #630000; font-size: 23px; line-height: 22px;">B-&gt;ppbartaunu analysis</span>

---++ People working on this:

Mark Smith, Matthew Tilley, Mitesh Patel, Ryan Newcombe

-- Main.MarkElliotSmith - 2017-12-04
---++ Presentations:
   * Mark, 31/01/18 - <a href="https://indico.cern.ch/event/701143/contributions/2879686/attachments/1592820/2521432/WG_310118.pdf" target="_self" title="Semileptonic WG">Semileptonic WG</a>
   * Mark, 02/02/18 - <a href="https://indico.cern.ch/event/692131/contributions/2876845/attachments/1594330/2524402/HLT_020218.pdf" target="_self">HLT meeting</a>
---++ Repository:

<a href="https://gitlab.cern.ch/lhcb-slb/B2pplnu" target="_blank" title="https://gitlab.cern.ch/lhcb-slb/B2pplnu">https://gitlab.cern.ch/lhcb-slb/B2pplnu</a>
---++ Stripping:

https://gitlab.cern.ch/lhcb/Stripping/blob/master/Phys/StrippingArchive/python/StrippingArchive/Stripping28/StrippingSL/StrippingB2PPbarMuForTauMu.py
---++ Stripping Info:

For the restripping campaign the two fake proton lines (opposite and same-sign) and the TOPO line have been restripped. The changes are:
   * Tighten the track %$\chi^{2} / DOF$% cut from 6 to 3 on the protons. This cut should be applied offline anyway.
   * Tighten the %$p\overline{p}$% vtx %$\chi^{2}$% cut from 10 to 8.
   * Change prescale on the fake proton lines from 0.15 to 0.06 to keep within the rate.
   * Fix to include both sign of fake proton (take wrt to the muon) - previously we had only taken one which missed a large chunk.
   * Include 3 and 4 body TOPO HLT2 in the topo line.
Ensure that the vtx %$\chi^{2}$% and track %$\chi^{2}$% are consistently applied to all the samples!
---++ Trigger

https://gitlab.cern.ch/lhcb/Hlt/tree/2017-reference/Hlt/Hlt2Lines/python/Hlt2Lines/XcMuXForTau

---++ Data Location:
---+++ Run 1 for FF fit
   * 2011 - /LHCb/Collision11/Beam3500GeV-VeloClosed-Mag[Up,Down]/Real Data/Reco14/Stripping21r1p1a/90000000/SEMILEPTONIC.DST
   * 2012 - /LHCb/Collision12/Beam4000GeV-VeloClosed-Mag[Up,Down]/Real Data/Reco14/Stripping21r0p1a/90000000/SEMILEPTONIC.DST
The stripping lines are __bhad2PMuXLine__ and __bhad2PMuXFakepLine__ .
---+++ Run 2 for R(pp)
---+++ J/psi K for kinematic corrections
   * 2018 - /LHCb/Collision18/Beam6500GeV-VeloClosed-Mag[Down,Up]/Real Data/Reco18/Stripping34/90000000/LEPTONIC.MDST
   * 2017 - /LHCb/Collision17/Beam6500GeV-VeloClosed-Mag[Down,Up]/Real Data/Reco17/Stripping29r2/90000000/LEPTONIC.MDST
   * 2016 - /LHCb/Collision16/Beam6500GeV-VeloClosed-Mag[Down,Up]/Real Data/Reco16/Stripping28r1/90000000/LEPTONIC.MDST
The stripping line is __StrippingB2XMuMu_Line__

---+++ J/psi K for neutral isolation
   * 2018 - /LHCb/Collision18/Beam6500GeV-VeloClosed-Mag[Down,Up]/Real Data/Reco18/Stripping34/90000000/DIMUON.DST
   * 2017 - /LHCb/Collision17/Beam6500GeV-VeloClosed-Mag[Down,Up]/Real Data/Reco17/Stripping29r2/90000000/DIMUON.DST
   * 2016 - /LHCb/Collision16/Beam6500GeV-VeloClosed-Mag[Down,Up]/Real Data/Reco16/Stripping28r1/90000000/DIMUON.DST
The stripping line is __StrippingBetaSBu2JpsiKDetachedLine__

---+++ Data
   * 2018 - stripping 34 - /LHCb/Collision18/Beam6500GeV-VeloClosed-Mag[Up,Down]/Real Data/Reco18/Stripping34/90000000/SEMILEPTONIC.DST
   * 2018 - stripping 34r0p1 - DV v44r10p2 - /LHCb/Collision18/Beam6500GeV-VeloClosed-Mag[Up,Down]/Real Data/Reco18/Stripping34r0p1/90000000/SEMILEPTONIC.DST
   * 2017 - stripping 29r2 - /LHCb/Collision17/Beam6500GeV-VeloClosed-Mag[Up,Down]/Real Data/Reco17/Stripping29r2/90000000/SEMILEPTONIC.DST
   * 2016 - stripping 28r1p1 - /LHCb/Collision16/Beam6500GeV-VeloClosed-Mag[Up,Down]/Real Data/Reco16/Stripping28r1p1/90000000/SEMILEPTONIC.DST
The stripping lines are __B2PPbarMuForTauMuLine__, __B2PPbarMuForTauMuTopoLine__, __B2PPbarMuForTauMufakePLine__, __B2PPbarMuForTauMuSSfakePLine__, __B2PPbarMuForTauMuSSLine__, __B2PPbarMuForTauMufakeMuLine__

---++ MC Location:
---+++ Run 1 for FF fit
| Mode | Event type | Dec file | BK path | Comments |
| %$B\to p\overline{p}\mu\nu_{\mu}$% | 12513050 | Bu_ppmunu=DecProdCut.dec | /MC/2012/Beam4000GeV-2012-MagDown-Nu2.5-Pythia8/Sim09b/Trig0x409f0045/Reco14c/Stripping21NoPrescalingFlagged/12513050/ALLSTREAMS.DST | Sim09b, Pythia 8 |
| ^ | ^ | ^ | /MC/2012/Beam4000GeV-2012-MagDown-Nu2.5-Pythia8/Sim08g/Digi13/Trig0x409f0045/Reco14c/Stripping20NoPrescalingFlagged/12513050/ALLSTREAMS.DST | Sim08g, Pythia 8 |
| ^ | ^ | ^ | /MC/2012/Beam4000GeV-2012-MagDown-Nu2.5-Pythia6/Sim08g/Digi13/Trig0x409f0045/Reco14c/Stripping20NoPrescalingFlagged/12513050/ALLSTREAMS.DST  | Sim08g, Pythia 6 |
| %$B\to p\Delta(\to pX)\mu\nu_{\mu}$% cocktail | 12813410 | Bu_Delpbarmunu,pX=TightCut.dec | /MC/2012/Beam4000GeV-2012-MagDown-Nu2.5-Pythia8/Sim09c/Trig0x409f0045/Reco14c/Stripping21NoPrescalingFlagged/12813410/ALLSTREAMS.DST | Sim09c, Pythia 8, GEN cuts |
| %$B\to pN^{*}(\to pX)\mu\nu_{\mu}$% cocktail | 12813400 | Bu_pNstmunu,pX=TightCut.dec | /MC/2012/ Beam4000GeV -2012-MagDown-Nu2.5-Pythia8/Sim08h/Digi13/Trig0x409f0045/Reco14c/Stripping20NoPrescalingFlagged/12813400/ALLSTREAMS.DST | Sim08h, Pythia 8, GEN cuts |
| %$B^{0}\to p\bar{p}DX$% | 11774000 | Bd_D0ppbar,Xmunu=DecProdCut.dec | /MC/2012/Beam4000GeV-2012-MagDown-Nu2.5-Pythia8/Sim09c/Trig0x409f0045/Reco14c/Stripping21NoPrescalingFlagged/11774000/ALLSTREAMS.DST | Sim09c, Pythia 8 |
| %$B^{+}\to p\bar{p}D\mu\nu_{\mu}$% | 12572000 | Bu_D0ppmunu=TightCut.dec | /MC/2012/Beam4000GeV-2012-MagDown-Nu2.5-Pythia8/Sim09c/Trig0x409f0045/Reco14c/Stripping21NoPrescalingFlagged/12572000/ALLSTREAMS.DST | Sim09c, Pythia 8, GEN cuts |
| %$B\to p\Lambda_{c}(\to pK\pi)\mu\nu_{\mu}$% | 12875010 | Bu_Lcpbarmunu,pKpi=TightCut.dec | /MC/2012/Beam4000GeV-2012-MagDown-Nu2.5-Pythia8/Sim08h/Digi13/Trig0x409f0045/Reco14c/Stripping20NoPrescalingFlagged/12875010/ALLSTREAMS.DST | Sim08h, Pythia8, GEN cuts |
| %$B\to p\Lambda_{c}(\to pX)\mu\nu_{\mu}$% | 12875411 | Bu_Lcpbarmunu,pX=TightCut.dec | /MC/2012/Beam4000GeV-2012-MagDown-Nu2.5-Pythia8/Sim08h/Digi13/Trig0x409f0045/Reco14c/Stripping20NoPrescalingFlagged/12875411/ALLSTREAMS.DST | Sim08h, Pythia8, GEN cuts |
| %$B\to N^{*}(\to \overline{p}X)\Lambda_{c}(\to pX)\mu\nu_{\mu}$% | 12675420 | Bu_LcNstmunu,pX=TightCut.dec | /MC/2012/Beam4000GeV-2012-MagDown-Nu2.5-Pythia8/Sim09c/Trig0x409f0045/Reco14c/Stripping21NoPrescalingFlagged/12675420/ALLSTREAMS.DST | Sim09c, Pythia8, GEN cuts |
| %$B\to p\Lambda_{c}\pi\pi\mu\nu_{\mu}$% | 12877400 | Bu_Lcpipipbarmunu,pX=TightCut.dec | /MC/2012/Beam4000GeV-2012-MagDown-Nu2.5-Pythia8/Sim09c/Trig0x409f0045/Reco14c/Stripping21NoPrescalingFlagged/12877400/ALLSTREAMS.DST | Sim09c, Pythia8, GEN cuts |

---++ DEC files of interest

The GEN level cuts on the background modes _should_ be:
<blockquote>

# tightCut.Cuts     =   {<br />#'[p+]cc'  : " in_range( 0.010 , GTHETA , 0.400 )& ( GPT &gt; 750 * MeV ) & (GP &gt; 14600 * MeV)" ,<br />#'[mu-]cc' : " in_range( 0.010 , GTHETA , 0.400 ) & (GP &gt; 2900 * MeV)"<br />#  }
</blockquote>

| Mode | No | File | Comments | Outstanding Issues | Generated |
| %$ \tau $% signal | 12513060 | | No GEN cuts | EvtGen model | |
| %$\mu$% normalisation | 12513050 | | No GEN cuts | EvtGen model | |
| %$\Delta$% cocktail | 12813411 | Bu_Delpbarmunu,pX=TightCut2.dec | GEN cuts | EvtGen model | |
| %$N^{*}$% cocktail | 12813401 | Bu_pNstmunu,pX=TightCut2.dec | GEN cuts | EvtGen model | |
| %$B^{0}\to p\bar{p}DX$% | 11774004 - needs committing | Bd_D0ppbarX,Xmunu=TightCut.dec | GEN cuts | | |
| %$B^{+}\to p\bar{p}DX$% | 12773002 - needs committing | Bu_D+ppbarX,Xmunu=TightCut.dec | GEN cuts | | |
| %$p\Lambda_{c}^{*}\mu\nu$% | 12877401 - needs committing | Bu_Lcpipipbarmunu,pX=TightCut2.dec | GEN cuts | %$p_{T}$% cut on muon | |
| %$p\Lambda_{c}\mu\nu$%, %$\Lambda_{c}\to pX$% | 12875412 | Bu_Lcpbarmunu,pX=TightCut2.dec | GEN cuts | | |
| %$p\Lambda_{c}\mu\nu$%, %$\Lambda_{c}\to pK\pi$% | 12875010 | Bu_Lcpbarmunu,pKpi=TightCut.dec | only has acceptance %$\theta$% cuts | | |
| %$p\Lambda_{c}\mu\nu$%, %$\Lambda_{c}\to pK^{0}\pi^{0}$% | ---- | | | | |
| %$ppD\mu\nu$% | 12572000 | | GEN cuts need fixing plus more D modes | %$p_{T}$% cut on muon | |
---++ MC efficiencies and estimated yields for Run 2

These numbers should be for the initial yields in the fit which will then add in the final selection efficiencies:

Note this is a slight underestimate, particularly on the tau yield due to the muon pT cut.
| *Mode* | *BK yield* | *Preselection Yield (strip + trig)* | *GEN/filter eff [%]* | *Stripping * Gen/filter eff [%]* | *Estimated yield after stripping* | *Assumptions* | *Angle cut eff [%]* | *Yield after angle cut* |
| %$ \tau $% signal |  4,030,760  |  46,356  |  21.336  |  0.245  |  332.3  | %$R(pp) = 0.25$% |  74.2  |  246.6  |
| %$\mu$% normalisation |  4,015,601  |  83,166  |  20.309  |  0.42  |  13093.92  | BF = %$6\times 10^{-6}$% |  81.1  |  10619.2  |
| %$\Delta$% cocktail |  1,015,908  |  93,069  |  1.1709  |  0.107  |  3335.8  | BF = %$6\times 10^{-6}$% |  77.0  |  2568.6  |
| %$N^{*}$% cocktail |  1,005,731  |  93,899  |  2.892  |  0.27  |  3335.8  | assume same as %$\Delta$% |  73.3  |  2445.1  |
| %$B^{0}\to p\bar{p}DX$% |  1,000,388  |  10,045  |  18.61  |  0.19  |  89582  | %$BF(B\to ppD) = 13.96\times 10^{-4}$% of which 6.5% to %$X\mu$% |  25.1  |  22485.1  |
| %$B^{+}\to p\bar{p}DX$% | | | | | | | | |
| %$p\Lambda_{c}^{*}\mu\nu$% |  1,015,453  |  100,742  |  1.1552  |  0.114  |  17770  | %$BF(B\to\Lambda_{c}^{*}\mu\nu) = 2.5\times 10^{-4}$% with %$BF(\Lambda_{c}\to pX) = 12\%$% |  30.7  |  5455.39  |
| %$ppD\mu\nu$% |  1,012,569  |  140,341  |  0.7998  |  0.11  |  10000  | ? |  31.0  |  3100  |
| %$p\Lambda_{c}\mu\nu$%, %$\Lambda_{c}\to pX$% |  1,110,857  |  18,592  |  18.51  |  0.31  |  17770  | %$BF(B\to\Lambda_{c}^{*}\mu\nu) = 2.5\times 10^{-4}$% with %$BF(\Lambda_{c}\to pX) = 12\%$% |  27.2  |  4833.44  |
%$\sigma(pp\to B^{+}X) = 86.6\mu b$% , Run 2 luminosity %$\approx 6 fb^{-1}$%, %$BF(\tau\to\mu\nu\nu) = 17.4 \%$%, %$5.196\times 10^{11}$% %$B^{\pm}$% in LHCB acceptance
---++ HistFactory extras

There is a nice set of slides introducing HistFactory here: <a href="https://indico.cern.ch/event/509900/contributions/2031935/" title="HistFactory intro">https://indico.cern.ch/event/509900/contributions/2031935/</a>

That link also includes a patch for HistFactory to implement Barlow-Beeston in more than 1 dimension. There are some more patches and speed gains to be found at<a href="https://twiki.cern.ch/twiki/bin/viewauth/LHCbPhysics/HistFactoryInfo" title="https://twiki.cern.ch/twiki/bin/viewauth/LHCbPhysics/HistFactoryInfo"> https://twiki.cern.ch/twiki/bin/viewauth/LHCbPhysics/HistFactoryInfo</a>

The file that you want is 'Patches_May2017_ROOT-6.08.06.tar.gz'.  The other versions seem to throw compilation errors. I have only tested the BB fix (HistFactoryModelUtils.cxx) - I couldn't get the other speed patches to work.
---++ Compiling ROOT

---+++ Mark's environment
Compiling ROOT can be a bit of a pain. The compilers on slc6 are ancient so you need to point CMake in the direction of an LCG installation to use instead. Also make sure you enable all the options.
   * Extract the ROOT source code to some directory (i.e. ~/root_source)
   * In the source directory you need to alter the CMakeLists.txt to use a reasonably modern version of gcc and g++ by adding the following:
      * <blockquote> SET(CMAKE_C_COMPILER /cvmfs/lhcb.cern.ch/lib/lcg/releases/gcc/6.2.0binutils/x86_64-slc6/bin/gcc)<br />SET(CMAKE_CXX_COMPILER /cvmfs/lhcb.cern.ch/lib/lcg/releases/gcc/6.2.0binutils/x86_64-slc6/bin/g++) </blockquote>
   * You need to alter your PATH and LD_LIBRARY_PATH to pick up the correct libraries etc (note this is for C shell but I am sure you can figure it out for bash):
      * <blockquote> setenv PATH /cvmfs/lhcb.cern.ch/lib/lcg/releases/gcc/6.2.0binutils/x86_64-slc6/bin\:$PATH<br />setenv LD_LIBRARY_PATH $LD_LIBRARY_PATH\:/cvmfs/lhcb.cern.ch/lib/lcg/releases/gcc/6.2.0/x86_64-slc6/lib64/\:/cvmfs/lhcb.cern.ch/lib/lcg/releases/gcc/6.2.0/x86_64-slc6/lib/\:/cvmfs/lhcb.cern.ch/lib/lcg/releases/gcc/6.2.0/x86_64-slc6/lib64/\:/cvmfs/lhcb.cern.ch/lib/lcg/releases/LCG_92/xrootd/4.7.0/x86_64-slc6-gcc62-opt/lib64 </blockquote>
   * Now copy in the code patches you wish to use (i.e. for HistFactory)
   * Make a new directory into which ROOT will be compiled (i.e. ~/myROOT) and cd into it.
   * Configure cmake
      * <blockquote> cmake -DAll=ON ~/root_source </blockquote>
   * Now you need to alter CMakeCache.txt so that it picks up the correct libraries for some things
      * <blockquote> //Path to a library.<br />XROOTD_XrdCl_LIBRARY:FILEPATH=/cvmfs/lhcb.cern.ch/lib/lcg/releases/LCG_92/xrootd/4.7.0/x86_64-slc6-gcc62-opt/lib64/libXrdCl.so<br /><br />//Path to a library.<br />XROOTD_XrdClient_LIBRARY:FILEPATH=/cvmfs/lhcb.cern.ch/lib/lcg/releases/LCG_92/xrootd/4.7.0/x86_64-slc6-gcc62-opt/lib64/libXrdClient.so<br /><br />//Path to a library.<br />XROOTD_XrdMain_LIBRARY:FILEPATH=XROOTD_XrdMain_LIBRARY-NOTFOUND<br /><br />//Path to a library.<br />XROOTD_XrdUtils_LIBRARY:FILEPATH=/cvmfs/lhcb.cern.ch/lib/lcg/releases/LCG_92/xrootd/4.7.0/x86_64-slc6-gcc62-opt/lib64/libXrdUtils.so<br /><br />//Dependencies for the target<br />XrdProofd_LIB_DEPENDS:STATIC=general;/cvmfs/lhcb.cern.ch/lib/lcg/releases/LCG_92/xrootd/4.7.0/x86_64-slc6-gcc62-opt/lib64/libXrdUtils.so;general;/cvmfs/lhcb.cern.ch/lib/lcg/releases/LCG_92/xrootd/4.7.0/x86_64-slc6-gcc62-opt/lib64/libXrdClient.so;general;/cvmfs/lhcb.cern.ch/lib/lcg/releases/LCG_92/xrootd/4.7.0/x86_64-slc6-gcc62-opt/lib64/libXrdCl.so;general;rpdutil;general;-lpthread;general;dl; </blockquote>
   * Now compile!
      * <blockquote> cmake --build . </blockquote>
   * At some point the compilation may segfault or throw some other fit. Don't worry - just run the last command again and it should pick up where it left off.
   * Now make sure you are using your newly installed ROOT version:
      * <blockquote> source ~/myROOT/bin/thisroot.csh </blockquote>

---+++ Ryan's environment

The following instructions pertain to building ROOT on lx0X.  The version I managed to use is 6.06.02, but it appears that 6.08.06 should also work.
   * Extract the ROOT source code to some directory (i.e. ~/root_source)
      * <blockquote> <a href="https://root.cern.ch/content/release-60602" title="https://root.cern.ch/content/release-60602">  Link to 6.06.02 source </a></blockquote> 
      * <blockquote> <a href="https://root.cern.ch/content/release-60806" title="https://root.cern.ch/content/release-60806">  Link to 6.08.06 source </a></blockquote>
   * In order to get around the issue of ancient compilers, it sufficed for me to add the following to my ~/.bashrc
      * <blockquote> export CC=/cvmfs/lhcb.cern.ch/lib/lcg/releases/gcc/4.9.3binutils/x86_64-slc6/bin/gcc <br /> export CXX=/cvmfs/lhcb.cern.ch/lib/lcg/releases/gcc/4.9.3binutils/x86_64-slc6/bin/g++</blockquote>
   * You need to alter your PATH and LD_LIBRARY_PATH to pick up the correct libraries etc (note this is for C shell but I am sure you can figure it out for bash):
      * <blockquote> export PATH=/cvmfs/lhcb.cern.ch/lib/lcg/releases/gcc/4.9.3binutils/x86_64-slc6/bin:$PATH<br />export LD_LIBRARY_PATH=/cvmfs/lhcb.cern.ch/lib/lcg/releases/gcc/4.9.3/x86_64-slc6/lib64:/cvmfs/lhcb.cern.ch/lib/lcg/releases/gcc/4.9.3/x86_64-slc6/lib:/cvmfs/lhcb.cern.ch/lib/lcg/releases/gcc/4.9.3/x86_64-slc6/lib64:/cvmfs/lhcb.cern.    ch/lib/lcg/releases/LCG_83/xrootd/4.2.3/x86_64-slc6-gcc49-opt/lib64:$LD_LIBRARY_PATH </blockquote>
   * Also, you will need to source a newer version of python, since the default version (2.6.6) on lx0X is also ancient by adding the following to your ~/.bashrc if you haven't done so already
      * <blockquote> export PATH=/cvmfs/lhcb.cern.ch/lib/lcg/releases/LCG_88/Python/2.7.13/x86_64-slc6-gcc49-opt/bin:$PATH<br />export PYTHONPATH=$PYTHONPATH:/cvmfs/lhcb.cern.ch/lib/lcg/releases/LCG_88/Python/2.7.13/x86_64-slc6-gcc49-opt/lib/python2.7/site-packages/ <br />export LD_LIBRARY_PATH=$LD_LIBRARY_PATH/cvmfs/lhcb.cern.ch/lib/lcg/releases/LCG_88/Python/2.7.13/x86_64-slc6-gcc49-opt/lib/</blockquote>
   * Now copy in the code patches you wish to use (i.e. for HistFactory)
   * Make a new directory into which ROOT will be compiled (i.e. ~/myROOT) and cd into it.
   * Configure cmake
      * <blockquote> cmake -DAll=ON ~/root_source </blockquote>
   * Now you need to alter CMakeCache.txt so that it picks up the correct libraries for some things
      * <blockquote> //Path to a library.<br />XROOTD_XrdCl_LIBRARY:FILEPATH=/cvmfs/lhcb.cern.ch/lib/lcg/releases/LCG_83/xrootd/4.2.3/x86_64-slc6-gcc49-opt/lib64/libXrdCl.so<br /><br />//Path to a library.<br />XROOTD_XrdClient_LIBRARY:FILEPATH=/cvmfs/lhcb.cern.ch/lib/lcg/releases/LCG_83/xrootd/4.2.3/x86_64-slc6-gcc49-opt/lib64/libXrdClient.so<br /><br />//Path to a library.<br />XROOTD_XrdMain_LIBRARY:FILEPATH=XROOTD_XrdMain_LIBRARY-NOTFOUND<br /><br />//Path to a library.<br />XROOTD_XrdUtils_LIBRARY:FILEPATH=/cvmfs/lhcb.cern.ch/lib/lcg/releases/LCG_83/xrootd/4.2.3/x86_64-slc6-gcc49-opt/lib64/libXrdUtils.so<br /><br />//Dependencies for the target<br />XrdProofd_LIB_DEPENDS:STATIC=general;/cvmfs/lhcb.cern.ch/lib/lcg/releases/LCG_83/xrootd/4.2.3/x86_64-slc6-gcc49-opt/lib64/libXrdUtils.so;general;/cvmfs/lhcb.cern.ch/lib/lcg/releases/LCG_83/xrootd/4.2.3/x86_64-slc6-gcc49-opt/lib64/libXrdClient.so;general;/cvmfs/lhcb.cern.ch/lib/lcg/releases/LCG_83/xrootd/4.2.3/x86_64-slc6-gcc49-opt/lib64/libXrdCl.so;general;rpdutil;general;-lpthread;general;dl;</blockquote>
   * You also need to make sure that the following flag is set in CMakeCache.txt
      * <blockquote>//Build the libRooFit advanced fitting package<br />roofit:BOOL=ON</blockquote>
   * Now compile!
      * <blockquote> cmake --build . </blockquote>
   * At some point the compilation may segfault or throw some other fit. Don't worry - just run the last command again and it should pick up where it left off.
   * You may also need to employ the two fixes at the following links at some point during compilation
      * <blockquote><a href="https://root-forum.cern.ch/t/installation-problem-root-6-06-02-mixmax-h/23803" title="https://root-forum.cern.ch/t/installation-problem-root-6-06-02-mixmax-h/23803">  https://root-forum.cern.ch/t/installation-problem-root-6-06-02-mixmax-h/23803 </a></blockquote>
      * <blockquote><a href="https://root-forum.cern.ch/t/issue-compiling-root-v6-10-02-on-centos7/25487" title="https://root-forum.cern.ch/t/issue-compiling-root-v6-10-02-on-centos7/25487">  https://root-forum.cern.ch/t/issue-compiling-root-v6-10-02-on-centos7/25487 </a></blockquote>
   * Now make sure you are using your newly installed ROOT version:
      * <blockquote> source ~/myROOT/bin/thisroot.sh </blockquote>
Topic revision: r22 - 2019-11-26 - RyanNewcombe
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