Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electric Charge Screening Effect in Single-W Production with the KoralW
  Monte Carlo   Any Monte Carlo event generator in which only initial state radiation (ISR)
is implemented, or ISR is simulated independently of the final state radiation
(FSR), may feature too many photons with large transverse momenta, which deform
the topology of events and result in too strong an overall energy loss due to
ISR. This overproduction of ISR photons happens in the presence of the final
state particle close to the beam particle of the same electric charge. It is
often said that the lack of the electric charge screening effect between ISR
and FSR is responsible for the above pathology in ISR. We present an elegant
approximate method of curing the above problem, without actually reinstalling
FSR. The method provides theoretical predictions of modest precision: < 2%. It
is, however, sufficient for the current 1W data analysis at the LEP2 collider.
Contrary to alternative methods implemented in other MC programs, our method
works for the ISR multiphotons with finite p_T. Although this method is not an
exact implementation of the complete/exact ISR, FSR and their interference, it
is very closely modelled on it. We present a variety of numerical results
obtained with the newest version of the KoralW Monte Carlo, in which this
method is already implemented.

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The categories of this paper are: acc-phys
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The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
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The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
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The categories of this paper are: quant-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: alg-geom
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The categories of this paper are: atom-ph
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The categories of this paper are: eess
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The categories of this paper are: cs