*** parametrizations of FRAGMENTATION FUNCTIONS ***

content of this page:

parametrizations (this page)
Stefan Kretzer	all three combined in one FORTRAN library (courtesy of S.Kretzer)
Kniehl, Kramer, Pötter
Bourhis, Fontannaz, Guillet, Werlen

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Stefan Kretzer has provided some FORTRAN code together with data-grids for easy read out of his parametrizations for fragmentation functions of
pions,
kaons,
and charged hadrons
as given in PRD 62, 054001 (2000).
The code interpolates the desired fragmentation functions from the grids. (A brief explanation for usage is contained in the header of the file with the FORTRAN code.)

here is the reference:

S. Kretzer, Phys. Rev. D 62 (2000) 054001

`Fragmentation functions from flavour-inclusive and flavour-tagged e⁺e^- annihilations'

SPIRES , Phys. Rev. D Server

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Björn Pötter maintains a Web-Page where a FORTRAN-subroutine can be downloaded which produces the Kniehl/Kramer/Pötter parametrizations of fragmentation functions of
(pi ⁺ + pi ^- ) /2,
(K ⁺ + K ^- ) /2,
(K ⁰ + K ⁰)/2 ,
(p + p) /2,
(pi ⁰),
(n + n) /2,
and (h ⁺ + h ^-) [as sum of pions, kaons and protons] ,
as given in NPB582 (2000) 514.

here is the reference:

B.A. Kniehl, G. Kramer and B. Pötter, Nucl. Phys. B582, 514 (2000)

`Fragmentation functions for pion, kaons and protons at next-to-leading order'

SPIRES , Nuclear Physics Electronic

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here is the reference:

L. Bourhis, M. Fontannaz, J.P. Guillet and M. Werlen, Eur. Phys. J. C19, 89 (2001)

`Next-to-leading order determination of fragmentation functions'

SPIRES , Europ. Phys. Jour. C Server

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Stefan Kretzer has provided a FORTRAN library which allows to read out all of the above parametrizations with one tool.

 Important: March 5, 2002. The FORTRAN library has been updated (thanks to C. Bourelly) because of a typo in the BFGW routine, by S. Kretzer.

Brief instructions for usage:
(see also the MANUAL provided with the package)

1. download the file lib.tar.gz (Netscape: "Shift+Left Mouse")
2. unpack with "gunzip lib.tar.gz" and "tar -xvf lib.tar"
3. compile with "make -f Make_lib toy.run" (on a UNIX system)
4. execute "toy.run"
5. the input parameters can be changed in the file "toy.f"

   • iparton =	5,4,3,2,1,0,-1,...,-5 means b,c,s,d,u,g,ubar,...,bbar
     ffset =	1,2,3 means K(retzer), KKP, BFGW
     fforder=	0,1 is LO, NLO(MSbar); (note: no LO set for BFGW)
     ihadron=	1,2,3 is pi,K,h,p,n; (note: no pi,K sets for BFGW, no p,n sets for K, BFGW)
     icharge=	0,1,2,3 is 0,+,-,+&-; (note: 3 = +&- = charge sum (NOT average) in this library for the neutral (icharge=0) particles K0, n)
     icp =	1,2,3 chooses between particle, anti-particle or sum of both (icp is inactive for pi,h,p and charged Kaons)

   • Subroutine "dlib" returns D(z,Q² ) [NOT z*D(z,Q²)] as an array "dff(iparton)" of dimension dff(-5:5)

   (after change of input parameters return to point 3. above)

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Last modified: Tue, Mar 05, 2002 -- 12:46 --