Difference between revisions of "PEPSI"

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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>. [[PEPSI-pdf | Tables 1 and 2]] list internal allowed values of <tt>LST(15)</tt> for polarised and unpolarised distributions respectively.
 
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>. [[PEPSI-pdf | Tables 1 and 2]] list internal allowed values of <tt>LST(15)</tt> for polarised and unpolarised distributions respectively.
  
<span id="polarisedTable"></span>
+
Pepsi is linked with the pdflib such all PDFs included in there can be used by setting <tt>LST(15)</tt> to the respective PDF-ID
 
 
{| 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
 
|-
 
| 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)
 
|-
 
| 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
 
|-
 
| 120 || Stanley J.Brodsky Nucl.Phys. B441(1995)
 
|-
 
| 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     
 
|-
 
| 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   
 
|-
 
| 130 || Fake sample: unpolarized  Gehrmann  et al hep-ph/9512406 with Delta u(x) = 0.5 * u(x) and Delta d(x) = 0.
 
|-
 
| 131 || Fake sample: unpolarized  Gehrmann  et al hep-ph/9512406 with Delta d(x) = 0.5 * d(x) and Delta u(x) = 0.
 
|-
 
| 132 || fit routine. (Is outside the official code.)
 
|-
 
| 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
 
|-
 
| 137 || MRS low Q2
 
|-
 
| 144  || grsv2000 hep-ph/0011215  LO standard scenario   
 
|-
 
| 145  || grsv2000 hep-ph/0011215  LO valence scenario   
 
|-
 
| 146  || grsv2000 hep-ph/0011215 NLO standard scenario   
 
|-
 
| 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
 
|-
 
| 151 ||  cteq5m NLO MSBAR
 
|-
 
| 152  || cteq5m1 NLO MSBAR (update)
 
|-
 
| 161 || mrs99 cor01 central gluon, a_s   
 
|-
 
| 162 || mrs99 cor02 higher gluon       
 
|-
 
| 163 || mrs99 cor03 lower gluon     
 
|-
 
| 164 || mrs99 cor04 lower a_s     
 
|-
 
| 165 || mrs99 cor05 higher a_s   
 
|-
 
| 166 || mrs99 cor06 quarks up       
 
|-
 
| 167 || mrs99 cor07 quarks down           
 
|-
 
| 168 || mrs99 cor08 strange up         
 
|-
 
| 169 || mrs99 cor09 strange down         
 
|-
 
| 170 || mrs99 cor10 charm up       
 
|-
 
| 171 || mrs99 cor11 charm down     
 
|-
 
| 172 || mrs99 cor12 larger d/u         
 
|-
 
| 173 || cteq6l LO
 
|-
 
| 174 || cteq6d DIS NLO
 
|-
 
| 175 || cteq6m NLO MSBAR             
 
|}
 
  
 
==References==
 
==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).
 
<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).

Revision as of 22:09, 28 June 2010

PEPSI (Polarised Electron Proton Scattering Interactions) [1] is a Monte Carlo generator for polarised deep inelastic scattering (pDIS). It is based on the LEPTO 4.3 Monte Carlo for unpolarised DIS.

Parton distribution functions

The distribution function to use in polarised leptoproduction is set via the variable LST(15) in the LEPTO COMMON block /LEPTOU/. Tables 1 and 2 list internal allowed values of LST(15) for polarised and unpolarised distributions respectively.

Pepsi is linked with the pdflib such all PDFs included in there can be used by setting LST(15) to the respective PDF-ID

References

(1) "PEPSI - a Monte Carlo generator for polarized leptoproduction", L. Mankiewicz, A. Schäfer and M. Veltri, Comp. Phys. Comm. 71, 305-318 (1992).