Changes between Version 22 and Version 23 of WikiStart


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Timestamp:
Jul 26, 2013, 12:36:37 PM (12 years ago)
Author:
Gustavo Gil Da Silveira
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  • WikiStart

    v22 v23  
    5050=== Structure functions ===
    5151
     52The W,,1,, and W,,2,, structure functions are defined in terms of the parton densities in the proton:
     53
     54F,,2,, = (4/9)*(u,,val,, + 2*u,,sea,,) + (1/9)*(d,,val,, + 2*d,,sea,,) + (1/9)*2*s,,sea,,
     55
     56F,,1,, = F,,2,,/2x
     57
     58with Q^2^ = Q^2^,,min,, for the region below the Q^2^,,min,, of each parametrization.
     59
    5260The built-in PDFs in `LPAIR` are replaced by two paramatrizations for the parton densities:
    5361
    54 1. Glueck-Reya-Vogt (`GRV`) [[http://dx.doi.org/10.1007/s100520050289|Eur. Phys. J. C5 (1998) 461]]: version `GRV95` at leading order (`LO`) in α,,s,,.
    55 {{{
    56 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
    57 *                                                                   *
    58 *     G R V  -  P R O T O N  - P A R A M E T R I Z A T I O N S      *
    59 *                                                                   *
    60 *                          1998 UPDATE                              *
    61 *                                                                   *
    62 *                  For a detailed explanation see                   *
    63 *                   M. Glueck, E. Reya, A. Vogt :                   *
    64 *        hep-ph/9806404  =  DO-TH 98/07  =  WUE-ITP-98-019          *
    65 *                  (To appear in Eur. Phys. J. C)                   *
    66 *                                                                   *
    67 *   This package contains subroutines returning the light-parton    *
    68 *   distributions in NLO (for the MSbar and DIS schemes) and LO;    *
    69 *   the respective light-parton, charm, and bottom contributions    *
    70 *   to F2(electromagnetic); and the scale dependence of alpha_s.    *
    71 *                                                                   *
    72 *   The parton densities and F2 values are calculated from inter-   *
    73 *   polation grids covering the regions                             *
    74 *         Q^2/GeV^2  between   0.8   and  1.E6 ( 1.E4 for F2 )      *
    75 *            x       between  1.E-9  and   1.                       *
    76 *   Any call outside these regions stops the program execution.     *
    77 *                                                                   *
    78 *   At Q^2 = MZ^2, alpha_s reads  0.114 (0.125) in NLO (LO); the    *
    79 *   heavy quark thresholds, QH^2 = mh^2, in the beta function are   *
    80 *            mc = 1.4 GeV,  mb = 4.5 GeV,  mt = 175 GeV.            *
    81 *   Note that the NLO alpha_s running is different from GRV(94).    *
    82 *                                                                   *
    83 *    Questions, comments etc to:  avogt@physik.uni-wuerzburg.de     *
    84 *                                                                   *
    85 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
    86 }}}
     621. Glueck-Reya-Vogt (`GRV`) [[http://dx.doi.org/10.1007/s100520050289|Eur. Phys. J. '''C5''' (1998) 461]]: version `GRV95` at leading order (`LO`) in α,,s,,.
    8763
    88 2. Parametrization by Fiore et al [[http://epja.epj.org/articles/epja/abs/2002/10/100500505/100500505.html|Eur. Phys. J. A15 (2002) 505]].
     64 * 0.4 < Q^2^/GeV^2^ < 1.E6;
     65 * 1.E-5 < x < 1.
    8966
    90 >**Abstract**: An explicit model realizing parton-hadron duality and fitting the data is suggested. Complex nonlinear Regge trajectories are important ingredients of the
     67[[source:trunk/plots/PDFs/GRV/README|README]]
     68
     692. Parametrization by Fiore et al [[http://epja.epj.org/articles/epja/abs/2002/10/100500505/100500505.html|Eur. Phys. J. '''A15''' (2002) 505]].
     70
     71>**Abstract**: An explicit model realizing parton-hadron duality and fiting the data is suggested. Complex nonlinear Regge trajectories are important ingredients of the
    9172>model. The inclusion of ∆ and N^∗^ trajectories should account for all resonances in the direct channel. The exotic trajectory is responsible for the smooth background.
    9273
    … …  
    9475
    9576[[Image(source:/trunk/plots/FIORE_F2_x.png, 500px)]]
     77
     783. Parametrization by `Martin-Ryskin-Stirling-Thorne` (`MRST` 2001) at leading order [[http://www.sciencedirect.com/science/article/pii/S0370269302014831|Phys. Lett. '''B531''' (2002) 216]]
     79
     80 * 0.4 < Q^2^/GeV^2^ < 1.E6;
     81 * 1.E-5 < x < 1.
     82
     83[[source:trunk/plots/PDFs/MRST2001/README|README]]
     84
     854. Parametrization by `Martin-Stirling-Thorne-Watt` (`MSTW` 2008) at leading order [[http://link.springer.com/article/10.1140%2Fepjc%2Fs10052-009-1072-5| Eur. Phys. J. '''C63''' (2009) 189]]
     86
     87 * 1.25 < Q^2^/GeV^2^ < 1.E7;
     88 * 1.E-5 < x < 1.
     89
     90[[source:trunk/plots/PDFs/MSTW2008/README|README]]
    9691
    9792=== Variables ===
    … …  
    177172
    178173[[https://cp3.irmp.ucl.ac.be/projects/LpairAnalysis/wiki/RatioSURIGRVCutsMx300GeV|Ratio between SURI and GRV]]
     174[[https://cp3.irmp.ucl.ac.be/projects/LpairAnalysis/wiki/RatioSURIGRVMSTWMRSTCutsMx300GeV|Ratio between SURI, GRV, MSTW and MRST]]
    179175
    180176== LPAIR++ ==