CalcHEP tutorial - Revision history

Hepmdb: /* Involving partons */

2015-07-27T13:01:46Z

‎Involving partons

Hepmdb: /* A simple leptonic process */

2015-07-27T12:52:26Z

‎A simple leptonic process

Hepmdb at 12:32, 27 July 2015

2015-07-27T12:32:56Z

Hepmdb: /* Plots */

2014-12-04T18:10:23Z

‎Plots

Hepmdb at 18:09, 4 December 2014

2014-12-04T18:09:30Z

Hepmdb: /* Final words */

2014-08-20T11:31:20Z

‎Final words

Hepmdb: /* A template batch file */

2014-08-20T11:29:39Z

‎A template batch file

Hepmdb: /* Kinematics and regularization */

2014-08-19T13:02:37Z

‎Kinematics and regularization

Hepmdb: /* Parallelization */

2014-08-19T12:59:05Z

‎Parallelization

Hepmdb: /* Final words */

2014-08-19T12:54:39Z

‎Final words

@@ Line 151: / Line 151: @@
 <center><tt>Process: p,p → W,b,B </tt></center>
-As the W boson is a gauge boson, we need to include a decay mode of this particle. We will look at its decay to an unspecified charged lepton and its corresponding neutrino. To do this, new variable names need to be input, we will us <tt>le</tt> for any charged lepton, and <tt>n</tt> for any neutrino. The decay is written as follows:
+As the W boson is a gauge boson, we need to include a decay mode of this particle. We will look at its decay to an unspecified charged lepton and its corresponding neutrino. To do this, new variable names need to be input, we will use <tt>le</tt> for any charged lepton, and <tt>n</tt> for any neutrino. The decay is written as follows:
 <center><tt>Decay: W → le,n</tt></center>
@@ Line 177: / Line 177: @@
 The remaining lines of this section are commented out because they are not necessary for this computation, so it is best to ignore them.
-In <tt>Momentum Info</tt> for this process we will set the energy of the beams to match that of the most recent LHC energy, so each beam is set to 4000GeV.
+In <tt>Momentum Info</tt> for this process we will set the energy of the beams to match that of the most recent LHC energy, so each beam is set to 6500GeV.
-<center><tt>p1: 4000</tt></center>
+<center><tt>p1: 6500</tt></center>
-<center><tt>p2: 4000</tt></center>
+<center><tt>p2: 6500</tt></center>
 === Model Parameters ===
-Next we can change the model parameters, but for this example we will keep them as in the default model files.
+Next we can change the model parameters, but for this example we will keep them as the default model values.
 We will again scan over the Higgs masses, as in the previous example. The batch template gives the following values, but you are free to alter these to suit your needs.
@@ Line 257: / Line 257: @@
 === Run the File ===
-The batch file is now ready to run, set it running as instructed in the previous example. To check the progress of the job and whether it has finished, select the <tt>Check submitted job</tt> option.
+The batch file is now ready to run, set it running as instructed in the previous example. To check the progress of the job and whether it has finished, select the <tt>Check Job Progress</tt> option.

@@ Line 13: / Line 13: @@
 === Preparing <tt>HEPMDB</tt> ===
-First, connect to <tt>HEPMDB</tt> and go in the <tt>Calculate</tt> section. In the left panel, in the <tt>CalcHEP</tt> section, check whether the <tt>Standard Model (CKM=1)</tt> line appears. If not, in the <tt>CalcHEP</tt> menu, choose <tt>Import model</tt>. When you find the line <tt>Standard Model (CKM=1)</tt> for <tt>CalcHEP</tt> (it should be the model 43), select it and click <tt>Select</tt>. The model should now be accessible in your environment.
+First, connect to <tt>HEPMDB</tt> and go to the <tt>Calculate</tt> section. In the left panel, under <tt>CalcHEP</tt>, check whether the <tt>Standard Model (CKM=1)</tt> line appears. If not, in the <tt>File</tt> menu, choose <tt>Import a model</tt>. When you find the line <tt>Standard Model (CKM=1)</tt> for <tt>CalcHEP</tt> (it should be model 43), select it and click <tt>Select</tt>. The model should now be accessible in your environment.
-This model is the complete standard model without CKM matrix. As a consequence, it is lighter and in situation where quarks' flavours don't matter, it gives the same results as the standard model.
+This model is the complete standard model without the CKM matrix. As a consequence, it is lighter and in situations where quark flavours don't matter, it gives the same results as the standard model.
 === A template batch file ===
-Select the model and select <tt>Edit Batch File</tt> in the <tt>CalcHEP</tt> menu. A new window will appear. You will be able to edit the batch file which is the file describing the process of interest. Click on the button <tt>Load batch template</tt>.
+Select the model and select <tt>Edit Batch File</tt> in the <tt>Selection</tt> menu. A new window will appear. You will be able to edit the batch file which is the file describing the process of interest. Click on the button <tt>Import Full Template</tt>.
 You now have a template file with nearly every possible field already offered. You also have help in the comments. The comments are lines beginning with a #. They are ignored by <tt>CalcHEP</tt> and thanks to them, you can add any information you want for anybody reading the batch file.
@@ Line 24: / Line 24: @@
 === Model information ===
 The first three fields are information about the model.
-# The first line gives the model to use. You should not touch it as this specifies the model in the <tt>CalcHEP</tt> local batch mode. There is no default for this setting so this line must be included.
+# The first line states the model to be used. You should not touch it as this specifies the model in the <tt>CalcHEP</tt> local batch mode. There is no default for this setting so this line must be included. The model name should be exactly as it appears in the model selection menu.
 # The second option is <tt>Model changed</tt>. This tells <tt>CalcHEP</tt> that model files have been changed.
 # Finally, <tt>Gauge</tt> specifies which gauge is used, Feynman or unitary. Many models are built implicitly assuming that the gauge is Feynman's, so you should not change this field either.
@@ Line 32: / Line 32: @@
 <center><tt>Process: e,E -> m,M,l,L</tt></center>
-In the standard model of <tt>CalcHEP</tt>, <tt>e</tt> refers to electrons, <tt>m</tt> to muons, <tt>l</tt> to taus and the capital letters to their anti-particle. The list of particle names and symbols to use can be viewed by selecting <tt>View Particles</tt> in the <tt>CalcHEP</tt> drop-down menu. You cannot access it while editing the batch file however.
+In the standard model of <tt>CalcHEP</tt>, <tt>e</tt> refers to electrons, <tt>m</tt> to muons, <tt>l</tt> to taus and the capital letters to their anti-particle. The list of particle names and symbols to use can be viewed by selecting <tt>View Particles</tt> in the <tt>Selection</tt> drop-down menu. You cannot access it while editing the batch file however.
 So we have set up an electron-positron scattering with a pair of muons and a pair of taus outgoing.
@@ Line 38: / Line 38: @@
 === Beams configuration ===
-We now have to configure the beams. The next field is about the pdfs. While this is useful for proton or any composite particle scattering, we do not need it for electron-positron scattering. We can write:
+We now have to configure the beams. The next field is about the pdfs. While this is useful for protons or any composite particle scattering, we do not need it for electron-positron scattering. We can write:
 <center><tt>pdf1: OFF</tt></center>
 And the same thing for the second pdf.
@@ Line 67: / Line 67: @@
 === Kinematics and regularization ===
 To tell <tt>CalcHEP</tt> how to handle the phase space, you should fill the kinematic information.
-Using this information, a nice parametrisation of the phase space is used.
+Using this information, a nice parameterisation of the phase space is used.
-In our case, the two ingoing particles will give two bosons, each of them decaying in a lepton pair. Hence, our kinematics are written as:
+In our case, the two incoming particles will give two bosons, each of them decaying into a lepton pair. Hence, our kinematics are written as:
 <center><tt>Kinematics :      12 -> 34, 56</tt></center>
 <center><tt>Kinematics :      34 -> 3 , 4</tt></center>
 <center><tt>Kinematics :      56 -> 5 , 6</tt></center>
-where the numbers refer to the particle in the process, in this case, 12 are the electron and positron, 3 and 4 are the muons etc.
+where the numbers refer to the particle in the process, in this case, 1 and 2 are the electron and positron, 3 and 4 are the muons etc.
 To improve the precision of the computation, it is important to tell <tt>CalcHEP</tt> where the resonances are.
-In our case, we have resonance on the dimuon and ditau masses for the Z boson and for the Higgs.
+In our case, we have a resonance on the dimuon and ditau masses for the Z boson and for the Higgs.
 So we will write:
 <center><tt>Regularization momentum: 34</tt></center>
@@ Line 129: / Line 129: @@
 === Final words ===
-The batch file is now complete and ready to run. Click <tt>Save</tt> and return to the <tt>CalcHEP</tt> drop-down menu, where you should select <tt>Run Batch File</tt>.
+The batch file is now complete and ready to run. Click <tt>Save Changes</tt> and return to the <tt>Selection</tt> drop-down menu, where you should select <tt>Run Batch File</tt>.
-You can check the progress of your batch file by selecting <tt>Check Submitted Job</tt> from the <tt>CalcHEP</tt> drop-down menu, and a progress report will appear in the box at the bottom of the window. From here there are options to cancel a job or show its start and predicted end time. If you have selected <tt>Show Start</tt> the start time will appear in blue in the same window, if the start time have a minus sign then that it how long the job has been running for.
+You can check the progress of your batch file by selecting <tt>Check Job Progress</tt> from the <tt>File</tt> drop-down menu, and a progress report will appear in the box at the bottom of the window. You can either click <tt>Cancel job</tt> to end the current job, or you can click <tt>Show Start</tt> to receive information on the estimated start time for the job (the time till it will reach the top of the queue and start running) and estimated finish time.
 == Involving partons ==

← Older revision		Revision as of 12:32, 27 July 2015
Line 1:		Line 1:

−	In order to familiarise yourself with <tt>CalcHEP</tt>, we will study two examples, one sightly more complicated than the other. Hopefully, by the end of this tutorial, you will be able to use majority of the functions of <tt>CalcHEP</tt>.	+	In order to familiarise yourself with <tt>CalcHEP</tt>, we will study two examples, one sightly more complicated than the other. Hopefully, by the end of this tutorial, you will be able to use the majority of the functions of <tt>CalcHEP</tt>.

	Please note that this is not a reference manual. If you wish to look at the reference manual, it is available [[CalcHEP reference\|here]].		Please note that this is not a reference manual. If you wish to look at the reference manual, it is available [[CalcHEP reference\|here]].

@@ Line 104: / Line 104: @@
 <center><tt>Regularization width:    wh</tt></center>
 <center><tt>Regularization power:    2</tt></center>
 === Event generation ===

@@ Line 256: / Line 256: @@
 === Remaining Information ===
-The rest of the batch file is explained in the previous example, and we use the same settings as before for <tt>Events Generation</tt>, <tt>Parallelization</tt>, <tt>Vegas</tt> and <tt>Event Generator</tt>. There is distribution information provided in the batch file, however the plotting capabilities of <tt>HEPMDB</tt> are limited, so we ignore these.
+The rest of the batch file is explained in the previous example, and we use the same settings as before for <tt>Events Generation</tt>, <tt>Parallelization</tt>, <tt>Vegas</tt> and <tt>Event Generator</tt>.
 === Run the File ===
 The batch file is now ready to run, set it running as instructed in the previous example. To check the progress of the job and whether it has finished, select the <tt>Check submitted job</tt> option.

@@ Line 83: / Line 83: @@
 <center><tt>Regularization width:    wZ</tt></center>
 <center><tt>Regularization power:    2</tt></center>
 <center><tt>Regularization momentum: 34</tt></center>
@@ Line 88: / Line 90: @@
 <center><tt>Regularization width:    wh</tt></center>
 <center><tt>Regularization power:    2</tt></center>
 <center><tt>Regularization momentum: 56</tt></center>
@@ Line 93: / Line 97: @@
 <center><tt>Regularization width:    wZ</tt></center>
 <center><tt>Regularization power:    2</tt></center>
 <center><tt>Regularization momentum: 56</tt></center>

@@ Line 108: / Line 108: @@
 === Parallelization ===
-When using the template file of <tt>HEPMDB</tt>, all parallelization parameters are good. It is possible though, to set the maximum number of CPU to 24.
+When using the template file of <tt>HEPMDB</tt>, all parallelization parameters are good.
 === Vegas session ===