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Prog. Theor. Phys. Vol. 103 No. 3 (2000) pp. 587-612
A QED Shower Including the Next-to-Leading Order Logarithmic Correction in e+e- Annihilation
Tomo Munehisa,*)
Junpei Fujimoto,*
Yoshimasa Kurihara*
and
Yoshimitsu Shimizu*
Faculty of Engineering, Yamanashi University,
Kofu 400-8511, Japan
*National Laboratory for High Energy Physics (KEK),
Tsukuba 305-0801, Japan
(Received July 16, 1999)
Abstract:
We develop an event generator, NLL-QEDPS, based on
the QED shower including the next-to-leading order
logarithmic correction in e+e- annihilation.
The shower model is a Monte Carlo technique to solve
the renormalization group equation so that
contributions of αmlog
n(S/me2) can be calculated for
any m and n systematically. Here α is the QED coupling,
me is the mass of the electron, and S is the square of the
total energy in the e+e- system.
While the previous QEDPS is
limited to the leading order logarithmic approximation,
which includes only contributions of the form
(αlog
(S/me2))n,
the model developed here contains terms of the form
α(αlog
(S/me2))n,
the the next-to-leading order logarithmic correction.
The shower model is formulated
for the initial radiation in e+e- annihilation.
The generator based on this model
gives us events with q2, which is a virtual
mass squared of the virtual photon and/or Z-boson,
to an accuracy of 0.04%, except for small q2/S.
URL :
http://ptp.ipap.jp/link?PTP/103/587/
DOI : 10.1143/PTP.103.587
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