Manual
User Manual:
Open the PDF directly: View PDF 
.
Page Count: 2
| Download | |
| Open PDF In Browser | View PDF |
Manual for Higgs boson production in association with bottom quarks in the POWHEG-BOX-V2 The bbH program in the POWHEG-BOX-V2 is an implementation of Higgs boson production in association with bottom quarks. Details of the calculation are described in Ref. [1]. The code is applicable for values of the mass and width of the Higgs boson where its decays can be treated using a narrow-width approximation, and off-shell effects are small. If you use this program, please quote Refs. [1–4]. Running the program Download the POWHEG-BOX-V2, following the instructions at the web site http://powhegbox.mib.infn.it/ and go to the process directory by typing $ cd POWHEG-BOX-V2/bbH Running is most conveniently done in a separate directory. Together with the code, we provide the directory testrun that contains sample input and seed files. For your runs, generate your own directory, for instance by doing $ mkdir myruns The directory must contain the powheg.input file, where parameters for the Higgs boson and the top quark decays as well as technical parameters are specified, and, for parallel running, a pwgseeds.dat file (see manual-BOX.pdf and Manyseeds.pdf in the POWHEG-BOX-V2/Docs directory). Before compiling make sure that: • lhapdf is installed and lhapdf-config is in the path, • gfortran, ifort or g77 is in the path, and the appropriate libraries are in the environment variable LD LIBRARY PATH. After compiling the executable pwhg main in the bbH directory, enter the myruns directory and perform all your runs there. The program can be run in a parallel mode in several consecutive steps by setting manyseeds 1 in the file powheg.input. With this option, the four steps of grid generation, NLO calculation, 1 upper bound generation, and event generation can then be performed in parallel, consecutively, as described, for instance, in the manual of the VBF Z Z directory in the POWHEG-BOX-V2. Alternatively, all results can be obtained in the serial mode of the program by de-activating the manyseeds option. If the default analysis is activated by setting the flag ANALYSIS=default in the Makefile before compiling the code, after the completion of the NLO calculation for each parallel run a file pwg-*-NLO.top is generated (where the * denotes the integer identifier of the run). These files contain histogram information at fixed-order accuracy for an inclusive setup in gnuplotfriendly format. The default analysis routine can easily be replaced with a personalized one by the user. The events that are ultimately generated in Les Houches format can be processed by a generic Monte-Carlo program. We are providing an interface to PYTHIA 6.4.25. After generating the exectuable main-PYTHIA-lhef and running it in the directory where the event files are stored, the program produces an output file pwgPOWHEG+PYTHIA-output.top that contains histograms at NLO+PS accuracy. The Monte-Carlo parameters can be modified by the user in the file setup-PYTHIA-lhef.f. References [1] B. Jäger, L. Reina, D. Wackeroth, Higgs boson production in association with b-jets in the POWHEG BOX, arXiv:1509.05843 [hep-ph]. [2] S. Dawson, C. B. Jackson, L. Reina and D. Wackeroth, Exclusive Higgs boson production with bottom quarks at hadron colliders, Phys. Rev. D 69 (2004) 074027 [hep-ph/0311067]. [3] S. Dawson, C. B. Jackson, L. Reina and D. Wackeroth, Higgs production in association with bottom quarks at hadron colliders , Mod. Phys. Lett. A 21 (2006) 89 [hep-ph/0508293]. [4] S. Alioli, P. Nason, C. Oleari and E. Re, A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX, JHEP 1006 (2010) 043 [arXiv:1002.2581 [hep-ph]]. 2
Source Exif Data:
File Type : PDF File Type Extension : pdf MIME Type : application/pdf PDF Version : 1.5 Linearized : No Page Count : 2 Producer : pdfTeX-1.40.16 Creator : TeX Create Date : 2018:07:27 14:45:25+02:00 Modify Date : 2018:07:27 14:45:25+02:00 Trapped : False PTEX Fullbanner : This is pdfTeX, Version 3.14159265-2.6-1.40.16 (TeX Live 2015) kpathsea version 6.2.1EXIF Metadata provided by EXIF.tools