Standard CMS 7TeV cross section twiki

This page documents the procedure and results of calculating cross sections for key processes in proton-proton collisions at 7TeV and 8TeV center of mass energies. To keep this page tidy, most of the important information is included as attachments which can be found at the bottom of this page. The cross sections were calculated using two different MCFM schemes (+-1). I assume the reader is familiar with these calculations, so I will refrain from any superfluous explanations.

--Alex

1) MCFM version 6.2 is used for all calculations.

2) All results are given in units of pb and have been rounded to 4 decimal places.

3) Higgs Mass = 125 GeV? for all calculations.

4) The factorization and renormalization scales are varied simultaneously and set to one another (i.e. uf=ur).

5) The errors given in results are the errors due to the pdf fit only.

6) Errors, averaged errors, and averaged cross sections are calculated following the procedure in the attached CMS Note.

7) Input information for the +-1 schemes is given below (also, attached are select input files which contain other input parameters):

**************** Electroweak parameters, where scheme = -1****************

zmass(+) 91.1876000 wmass(+) 80.3980000

zwidth(+) 2.4952000 wwidth(+) 2.1054000

Gf(+) 0.116639D-04 1/aemmz(+) 128.8900000

xw 0.2286027 mtop 156.9781961

gwsq 0.4264904 esq 0.0974969

top width 1.0316591 (LO)

mb 4.8000000 mc 1.2700000

Parameters marked (+) are input, others derived

******************************************************

**************** Electroweak parameters, where scheme = +1 ****************

zmass(+) 91.1876000 wmass(+) 80.3980000

zwidth(+) 2.4952000 wwidth(+) 2.1054000

Gf(+) 0.116639D-04 1/aemmz 132.3384323

xw 0.2226459 mtop(+) 172.5000000

gwsq 0.4264904 esq 0.0949563

top width 1.4533503 (LO)

mb 4.8000000 mc 1.2700000

Parameters marked (+) are input, others derived

******************************************************

I | Attachment | Action | Size | Date | Who | Comment |
---|---|---|---|---|---|---|

zip | INPUTS.zip | manage | 10820.5 K | 2012/09/12 - 20:32 | AlexGeorges | All input files for W, WZ, and ttbar processes. |

README.pdf | manage | 112.6 K | 2012/09/10 - 21:46 | AlexGeorges | Short description of how I calculate the cross sections. Useful for individuals trying to use the scripts I have set up to calculate cross sections on their own. This also provides some BG info on theory. | |

Results_minus1.pdf | manage | 4.5 K | 2012/10/15 - 22:13 | AlexGeorges | 7TeV & 8TeV results for -1 scheme | |

Results_plus1.pdf | manage | 72.1 K | 2012/09/14 - 20:08 | AlexGeorges | 7TeV & 8TeV results for +1 scheme | |

cmsnoteSMXsec.pdf | manage | 187.5 K | 2012/09/10 - 21:35 | AlexGeorges | CMS Note on the calculation of 7TeV processes | |

zip | inputs.zip | manage | 541.6 K | 2012/09/10 - 21:20 | AlexGeorges | Input files to MCFM configured to the nominal fit (i.e. LHAPDF# = 0) for both 7TeV & 8TeV. These constitute less than 1% of the total input files in this analysis. |

Topic revision: r14 - 2013/02/07 - 15:22:04 - AlexGeorges

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