Changes between Version 3 and Version 4 of InputEx


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Timestamp:
05/02/12 17:27:01 (8 years ago)
Author:
omatt
Comment:

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  • InputEx

    v3 v4  
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    3 <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <meta name="GENERATOR" content="Mozilla/4.77 [en]C-gatewaynet  (Win95; U) [Netscape]"> </head> <body>
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    52=== Basic Syntax Rules ===
     
    2320
    2421|| '''PROCESS''' || '''Sample Diagram''' || '''Notes''' ||
    25 || t > b e+ ve ||  <img alt="" align="center" src="/twiki/pub/Main/InputEx/t.gif" />  || Decay of the top. Particle one is decayed, particles 2,3,4 are the decay products ||
    26 || u u~ > d d~ QED=2 || <img alt="" src="/twiki/pub/Main/InputEx/uux_ddx_9999.gif" /> || Both the QCD and QED are set to 2. This entails that all the possible contributions (W,gluon,photon,Z) appear. In total 4 diagrams appear. ||
    27 || u u~ > d d~ ||  <img alt="" align="center" src="/twiki/pub/Main/InputEx/uux_ddx_9900.gif" />  || No coupling orders are specified, so only the dominating (QCD) contribution is included. The QED contributions (W,photon,Z) are now off. ||
    28 || u u~ > d d~ /w+ QCD=0 || <img alt="" src="/twiki/pub/Main/InputEx/uux_ddx_0099_w.gif" /> || The maximum number of QCD couplings is set to zero, and the contribution from an internal W+ (or W-) are eliminated. As a result only the contributions from the exchange of a photon and a Z appear. ||
    29 || u u~ > z > d d~ a QCD=0 || <img alt="" src="/twiki/pub/Main/InputEx/uux_z_ddxa_0099.gif" /> || The maximum number of QCD couplings is set to zero, and the presence of a Z in an s-channel diagram is requested. As a result possible contributions from the exchange of a W in the t-channel or a photon in the s-channel are excluded. ||
    30 || g g > t t~, (t >b w+, w+ > e+ ve), (t~ > b~ w-, w- > e- ve~) || <img alt="" src="/twiki/pub/Main/InputEx/gg_ttx_0204.gif" /> || This is t tbar production with semileptonic decays for both tops. No coupling orders are specified, so he production process will have only the dominating QCD contribution. The requirement of having the two top on-shell avoids the generation of non resonant contributions such as gg>bb~ZZ with the subsequent decays of the Z's, giving in total 203 diagrams instead of just 3. ||
     22|| t > b e+ ve ||  [[Image(t.gif)]]  || Decay of the top. Particle one is decayed, particles 2,3,4 are the decay products ||
     23|| u u~ > d d~ QED=2 || [[Image(uux_ddx_9999.gif)]] || Both the QCD and QED are set to 2. This entails that all the possible contributions (W,gluon,photon,Z) appear. In total 4 diagrams appear. ||
     24|| u u~ > d d~ ||  [[Image(uux_ddx_9900.gif)]]  || No coupling orders are specified, so only the dominating (QCD) contribution is included. The QED contributions (W,photon,Z) are now off. ||
     25|| u u~ > d d~ /w+ QCD=0 || [[Image(uux_ddx_0099_w.gif)]] || The maximum number of QCD couplings is set to zero, and the contribution from an internal W+ (or W-) are eliminated. As a result only the contributions from the exchange of a photon and a Z appear. ||
     26|| u u~ > z > d d~ a QCD=0 || [[Image(uux_z_ddxa_0099.gif)]] || The maximum number of QCD couplings is set to zero, and the presence of a Z in an s-channel diagram is requested. As a result possible contributions from the exchange of a W in the t-channel or a photon in the s-channel are excluded. ||
     27|| g g > t t~, (t >b w+, w+ > e+ ve), (t~ > b~ w-, w- > e- ve~) || [[Image(gg_ttx_0204.gif)]] || This is t tbar production with semileptonic decays for both tops. No coupling orders are specified, so he production process will have only the dominating QCD contribution. The requirement of having the two top on-shell avoids the generation of non resonant contributions such as gg>bb~ZZ with the subsequent decays of the Z's, giving in total 203 diagrams instead of just 3. ||
    3128
    3229=== Process Input Examples using Protons and Jets ===
    33 || '''PROCESS''' || '''Directories''' || '''Subprocesses''' |||| '''Notes''' ||
    34 || p p &gt; e+ ve || P0_qq_lvl <br />
    35  
    36 </p> <p> </p> || d~ u -> e+ ve [[br]] u d~ -> e+ ve || s~ c -> e+ ve [[br]] c s~ -> e+ ve || The special codes p and j, sum over gluon, and n light quark flavors and their anti_particles, as specified by the option. MadGraph is able to identify and combine explicitly identical subprocesses, and combine processes with same type of particles in the initial and final state (q/g/l/vl) into single directories ||
    37 || p p > W+ j j, W+ > l+ vl || P0_qq_lvlqq [[br]] P0_gq_lvlgq [[br]]P0_gg_lvlqq || u~ u -> e+ ve u~ d [[br]] g g -> mu+ vm s c~ [[br]] ... || u~ u -> mu+ vm u~ d [[br]] g g -> e+ ve s c~ [[br]] ... || In this example, W+ + jets production is requested, with the subsequent leptonic decay of the W+. If l=e,mu is chosen in the options, then both possibilities are included. MadGraph is able to identify and combine explicitly identical subprocesses, and combine processes with same type of particles in the initial and final state (q/g/l/vl) into common directories. ||
     30|| '''PROCESS_DEFINITION''' || '''Directories''' || '''Subprocesses''' |||| '''Notes''' ||
     31|| p p > e+ ve || P0_qq_lvl || d~ u -> e+ ve [[br]] u d~ -> e+ ve [[br]] s~ c -> e+ ve [[br]] c s~ -> e+ ve || The special codes p and j, sum over gluon, and n light quark flavors and their anti_particles, as specified by the option. MadGraph is able to identify and combine explicitly identical subprocesses, and combine processes with same type of particles in the initial and final state (q/g/l/vl) into single directories ||
     32|| p p > W+ j j, W+ > l+ vl || P0_qq_lvlqq [[br]] P0_gq_lvlgq [[br]]P0_gg_lvlqq || u~ u -> e+ ve u~ d, g g -> mu+ vm s c~, ... [[br]] u~ u -> mu+ vm u~ d, g g -> e+ ve s c~, ... || In this example, W+ + jets production is requested, with the subsequent leptonic decay of the W+. If l=e,mu is chosen in the options, then both possibilities are included. MadGraph is able to identify and combine explicitly identical subprocesses, and combine processes with same type of particles in the initial and final state (q/g/l/vl) into common directories. ||
    3833|| ||||||||||
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    4237-- Main.JohanAlwall - 2011-09-24