Abstract
We discuss theoretical uncertainties of the measurement of the W boson mass at LEP2 energies, reconstructed with the help of the tandem of the Monte Carlo event generators KoralW and YFSWW3. Exploiting numerical results obtained with these programs, and the existing knowledge in the literature, we estimate that the theoretical uncertainty of the W mass due to electroweak corrections, as reconstructed at LEP2 with the help of these programs, is ∼5 MeV. Since we use certain idealized event selections and a simple M W -fitting procedure, our numerical exercises can be (should be) repeated for the actual “ M W extraction methods” of the LEP2 measurements, using KoralW and YFSWW3 or other Monte Carlo programs.
Highlights
Work partly supported by the Polish Government grants KBN 5P03B12420 and KBN 5P03B09320, the European Commission 5-th framework contract HPRN-CT-2000-00149, the US DoE Contracts DE-FG05-91ER40627 and DE-AC03-76ER00515
In this work we would like to present our estimate of the theoretical uncertainties (TUs) related to electroweak corrections in the measurement of the mass of the W heavy boson in the LEP2 experiments
Monte Carlo (MC) ensures a direct unbiased link between the MW of the electroweak Lagrangian and the experimental LEP2 data, assuming perfect detector simulation. All this sounds like a strong argument to show that the theoretical uncertainties, coming from higher-order corrections and other imperfections of the theoretical calculations, can be studied only within the programming environment used in the actual LEP2 experiments, with the help of the K-Y MC tandem
Summary
Work partly supported by the Polish Government grants KBN 5P03B12420 and KBN 5P03B09320, the European Commission 5-th framework contract HPRN-CT-2000-00149, the US DoE Contracts DE-FG05-91ER40627 and DE-AC03-76ER00515. MC ensures a direct unbiased link between the MW of the electroweak Lagrangian and the experimental LEP2 data, assuming perfect detector simulation All this sounds like a strong argument to show that the theoretical uncertainties, coming from higher-order corrections and other imperfections of the theoretical calculations, can be studied only within the programming environment used in the actual LEP2 experiments, with the help of the K-Y MC tandem. If some effect turns out to be sizeable, that is at least 1/3 of the experimental error on MW (∼ 10 MeV), it should be reanalysed within a full-scale “MW -extraction” procedure of the relevant LEP2 data analysis In such a case, our paper can be used as a guideline for a more complete study to be performed by the experiments. YFSWW3) applied to the above process, i.e. for the double-resonant W W production and decay (see ref. [13] for more details)
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