Institut für Theoretische Teilchenphysik
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Institute for Theoretical Particle Physics (TTP)
Institute for Theoretical Particle Physics (TTP)
Institute for Theoretical Particle Physics (TTP)
Preprints
1997
TTP97-39 Theory of Jets in Deep Inelastic Scattering
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 +====== TTP97-39 Theory of Jets in Deep Inelastic Scattering  ====== 
 +  
 +  
 +   <hidden TTP97-39  Theory of Jets in Deep Inelastic Scattering  > The large center of mass energy and increasing statistical 
 + precision for a wide range of hadronic 
 + final state observables  at the HERA lepton-proton collider 
 + has provided a detailed testing ground for QCD  dynamics. 
 + Fully flexible next-to-leading order calculations are mandatory on the 
 + theoretical side for such tests and will be discussed in detail. 
 + Next-to-leading order QCD predictions for one- and two-jet cross sections  
 + in deep inelastic  scattering  with complete neutral  
 + current ($\gamma^\ast$ and/or $Z$) and charged current ($W^\pm$) exchange 
 + together with leading order results for three- and four-jet final states  
 + are presented. The theoretical framework, based on the phase space  
 + slicing method and the use of universal crossing functions, is described  
 + in detail. All analytical formulae necessary for the next-to-leading order  
 + calculations are provided. The  numerical results are based on the 
 + fully differential $ep \rightarrow n$ jets event generator \docuname\  
 + which allows to analyze any infrared and collinear safe observable and  
 + general cuts in terms of parton 4-momenta. The importance of higher order  
 + corrections is studied for various jet algorithms. Implications  
 + and comparisons with (ongoing) experimental analyses for  
 + jet cross sections at high $Q^2$, the determination of $\alpha_s(\mu_R)$,  
 + the gluon density,  power corrections in event shapes and the associated  
 + forward jet production in the low $x$ regime at HERA are discussed. 
 + A study of jet cross sections in polarized electron and polarized  
 + proton collisions shows that dijet events provide a good measurement of the 
 + polarized gluon distribution $\Delta g(x_g)$, in a region,  
 + where $x_g \Delta g(x_g)$ is expected to show a maximum. 
 +  
 + </hidden> 
 +|**E. Mirkes**  |  
 +| {{preprints:1997:ttp97-39.pdf|PDF}} {{preprints:1997:ttp97-39.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/9711224|arXiv]]   | 
 +| |