In-medium jet shape from energy collimation in parton showers: Comparison with CMS PbPb data at 2.76 TeV
Perez-Ramos, R., & Renk, T. (2014). In-medium jet shape from energy collimation in parton showers: Comparison with CMS PbPb data at 2.76 TeV. Physical Review D, 90(1), Article 014018. https://doi.org/10.1103/PhysRevD.90.014018
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Physical Review DDate
2014Copyright
© 2014 American Physical Society. This is an article whose final and definitive form has been published by American Physical Society.
Abstract: We present the medium-modified energy collimation in the leading-logarithmic approximation (LLA)
and next-to-leading-logarithmic approximation (NLLA) of QCD. As a consequence of more accurate
kinematic considerations in the argument of the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP)
fragmentation functions (FFs) we find a new NLLA correction
O
ð
α
s
Þ
which accounts for the scaling
violation of DGLAP FFs at small
x
. The jet shape is derived from the energy collimation within the same
approximations and we also compare our calculations for the energy collimation with the event generators
PYTHIA
6 and Y
A
JEM for the first time in this paper. The modification of jets by the medium in both cases is
implemented by altering the infrared sector using the Borghini-Wiedemann model. The energy collimation
and jet shapes qualitatively describe a clear broadening of showers in the medium, which is further
supported by Y
A
JEM in the final comparison of the jet shape with CMS PbPb data at center-of-mass energy
2.76 TeV. The comparison of the biased versus unbiased Y
A
JEM jet shape with the CMS data shows a more
accurate agreement for biased showers and illustrates the importance of an accurate simulation of the
experimental jet-finding strategy.
...


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American Physical SocietyISSN Search the Publication Forum
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http://journals.aps.org/prd/abstract/10.1103/PhysRevD.90.014018Publication in research information system
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Except where otherwise noted, this item's license is described as © 2014 American Physical Society. This is an article whose final and definitive form has been published by American Physical Society.
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