Difference between revisions of "PEPSI"

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PEPSI (Polarised Electron Proton Scattering Interactions) [[#Ref1|[1]]] is a Monte Carlo generator for polarised deep inelastic scattering (pDIS). It is based on the [http://www.isv.uu.se/thep/lepto/ LEPTO] 4.3 Monte Carlo for unpolarised DIS.
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This page is now maintained at [https://eic.github.io/software/pepsi.html https://eic.github.io/software/pepsi.html].
 
 
==Parton distribution functions==
 
 
 
The distribution function to use in polarised leptoproduction is set via the variable <tt>LST(15)</tt> in the LEPTO <tt>COMMON</tt> block <tt>/LEPTOU/</tt>. Tables 1 and 2 list the allowed values of <tt>LST(15)</tt> for polarised and unpolarised distributions respectively.
 
 
 
<span id="polarisedTable"></span>
 
 
 
{| style="margin: 1em auto 1em auto; width:65%" border="1" cellpadding="5"
 
|+ Table 1: Polarised parton distributions
 
! LST(15) !! Polarised parton distribution function
 
|-
 
| 101 ||  Schaefer, Phys. Lett. B 208,2 (1988) 175 for comparison with older PEPSI versions
 
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| 102 || free
 
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| 103 || free
 
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| 104 || Schaefer  et al hep-ph/9505306 using Glueck et al. Z. Phys. C 53 (1992) 127
 
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| 105 || Bartelski et al hep-ph/9502271 Set II(p,n)
 
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| 106 || Bartelski et al hep-ph/9502271 Set II(P,n)
 
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| 107 || Gehrmann hep-ph/9512406 Gluon A (NLO) + DGLAP 
 
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| 108 || Gehrmann hep-ph/9512406 Gluon A (NLO) + DGLAP
 
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| 109 || Gehrmann hep-ph/9512406 Gluon A (NLO) + DGLAP
 
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| 110 || Gehrmann  et al hep-ph/9512406 Gluon A (LO)
 
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| 111 || Gehrmann  et al hep-ph/9512406 Gluon B (LO)
 
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| 112 || Gehrmann  et al hep-ph/9512406 Gluon C (LO)
 
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| 113 || Gehrmann  et al hep-ph/9512406 Gluon A (LO) + (DGLAP)
 
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| 114 || Gehrmann  et al hep-ph/9512406 Gluon B (LO) + (DGLAP)
 
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| 115 || Gehrmann  et al hep-ph/9512406 Gluon C (LO) + (DGLAP)
 
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| 116 ||  M. Glueck, E. Reya, M. Stratmann and W. Vogelsang, DO-TH 95/13, RAL-TR-95-042 'standard' scenario, next-to-leading order
 
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| 117 ||  M. Glueck, E. Reya, M. Stratmann and W. Vogelsang, DO-TH 95/13, RAL-TR-95-042 'valence'  scenario, next-to-leading order
 
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| 118 ||  M. Glueck, E. Reya, M. Stratmann and W. Vogelsang, DO-TH 95/13, RAL-TR-95-042 'standard' scenario, leading order
 
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| 119 ||  M. Glueck, E. Reya, M. Stratmann and W. Vogelsang, DO-TH 95/13, RAL-TR-95-042 'valence'  scenario, leading order
 
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| 120 || Stanley J.Brodsky Nucl.Phys. B441(1995)
 
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| 121 || S.Keler & J.F.Owens  Phys.Lett. B266(1991) & Phys.Rev. D19(1994)1199
 
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| 124 || D. de Florian et al., hep-ph/9711440  LO set 1     
 
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| 125 || D. de Florian et al., hep-ph/9711440  LO set 2     
 
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| 126 || D. de Florian et al., hep-ph/9711440  LO set 3     
 
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| 127 || D. de Florian et al., hep-ph/9711440 NLO set 1     
 
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| 128 || D. de Florian et al., hep-ph/9711440 NLO set 2     
 
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| 129 || D. de Florian et al., hep-ph/9711440 NLO set 3   
 
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| 130 || Fake sample: unpolarized  Gehrmann  et al hep-ph/9512406 with Delta u(x) = 0.5 * u(x) and Delta d(x) = 0.
 
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| 131 || Fake sample: unpolarized  Gehrmann  et al hep-ph/9512406 with Delta d(x) = 0.5 * d(x) and Delta u(x) = 0.
 
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| 132 || fit routine. (Is outside the official code.)
 
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| 133 || CTEQ4LQ . UNPOL: Low Q2 parametrization is the only one used here. POL:  BOGUS, du=0.5* u(x) dd=-0.3*d(x)  0.0 all else
 
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| 137 || MRS low Q2
 
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| 144  || grsv2000 hep-ph/0011215  LO standard scenario   
 
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| 145  || grsv2000 hep-ph/0011215  LO valence scenario   
 
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| 146  || grsv2000 hep-ph/0011215 NLO standard scenario   
 
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| 147  || grsv2000 hep-ph/0011215 NLO valence scenario   
 
|}
 
 
 
<span id="unpolarisedTable"></span>
 
{| style="margin: 1em auto 1em auto; width:65%" border="1" cellpadding="5"
 
|+ Table 2: Unpolarised parton distributions
 
| 150 ||  cteq5l LO
 
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| 151 ||  cteq5m NLO MSBAR
 
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| 152  || cteq5m1 NLO MSBAR (update)
 
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| 161 || mrs99 cor01 central gluon, a_s   
 
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| 162 || mrs99 cor02 higher gluon       
 
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| 163 || mrs99 cor03 lower gluon     
 
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| 164 || mrs99 cor04 lower a_s     
 
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| 165 || mrs99 cor05 higher a_s   
 
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| 166 || mrs99 cor06 quarks up       
 
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| 167 || mrs99 cor07 quarks down           
 
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| 168 || mrs99 cor08 strange up         
 
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| 169 || mrs99 cor09 strange down         
 
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| 170 || mrs99 cor10 charm up       
 
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| 171 || mrs99 cor11 charm down     
 
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| 172 || mrs99 cor12 larger d/u         
 
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| 173 || cteq6l LO
 
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| 174 || cteq6d DIS NLO
 
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| 175 || cteq6m NLO MSBAR             
 
|}
 
 
 
==References==
 
<span id="Ref1">(1)</span> ''"PEPSI - a Monte Carlo generator for polarized leptoproduction"'', L. Mankiewicz, A. Sch&auml;fer and M. Veltri, Comp. Phys. Comm. '''71''', 305-318 (1992).
 

Latest revision as of 13:42, 9 June 2020

This page is now maintained at https://eic.github.io/software/pepsi.html.