Comparison of jet size in. nu. /sup -/p interactions with that in e/sup +/e/sup -/ annihilation. [Below 10 GeV] Page: 4 of 12
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one must make some assumptions to calculate the beam energy [fl] . The
muon track was selected using kinematic techniques [id] . Corrections have
been made in all distributions for muon selection efficiency, neutral current
background, and energy resolution.
Since published results on e^ e~ jets are always given for events hav-
ing ^ 4 charged particles, we impose the selection 5 charged particles
(S- 4 charged hadrons) on our data. To reduce background, we also demand
that y = (E- - E^J/E- ^ 0. 8. We use only events wit;- E_ f> 5 GeV. We
present the jet results in tine c. m. frame of the virtual boson-nucleon system,
as suggested by Stevenson  . We do not impose a Q selection on the data
presented in this paper, but have checked that a Q >1 (GeV/c) selection
has little effect on our results for W f> 3 GeV,
The angular size of a jet has been defined by many different variables.
We first consider sphericity [ii-12] , defined as
S = | MinS (P2)./£'P2). ,
where is relative to the jet axis and the sum is over all charged particles.
For a "perfect" jet event, S 0. The jet axis S isTLefined as the direction
in space that minimizes S; for vp interactions, that axis should approach the
virtual boson-nucleon axis at high c. m. energy, ;
, A second measure of the shape of an event is the variable thrust [ 13-14]
[? I P|t I ,/S (PiJ
where Pjj is relative to the jet axis and the sum is over all charged particles.
For a "perfect" jet event, T l.jj The jet’s thrust axis, T, is the direction
that maximizes T. At high enerjy, one expects T = S and so it is of interest
to check how close these two directions are at present energies.
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Derrick, M.; Fridman, A. & Gregory, P. Comparison of jet size in. nu. /sup -/p interactions with that in e/sup +/e/sup -/ annihilation. [Below 10 GeV], report, January 1, 1979; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1092405/m1/4/: accessed March 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.