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Probing the Hardest Branching within Jets in Heavy-Ion Collisions
- Source :
- Physical Review Letters. 119
- Publication Year :
- 2017
- Publisher :
- American Physical Society (APS), 2017.
-
Abstract
- We present the first calculation of the momentum sharing and angular separation distributions between the leading subjets inside a reconstructed jet in heavy ion collisions. These observables are directly sensitive to the hardest branching in the process of jet formation and are, therefore, ideal for studying the early stage of the in-medium parton shower evolution. The modification of the momentum sharing and angular separation distributions in lead-lead relative to proton-proton collisions is evaluated using the leading-order medium-induced splitting functions obtained in the framework of soft-collinear effective theory with Glauber gluon interactions. Qualitative and in most cases quantitative agreement between theory and preliminary CMS measurements suggests that the parton shower in heavy ion collisions can be dramatically modified early in the branching history. We propose a new measurement which will illuminate the angular distribution of the hardest branching within jets in heavy ion collisions.<br />Comment: 5 pages, 6 figures
- Subjects :
- Particle physics
Nuclear Theory
Astrophysics::High Energy Astrophysical Phenomena
FOS: Physical sciences
General Physics and Astronomy
Parton
01 natural sciences
High Energy Physics - Experiment
Nuclear Theory (nucl-th)
Nuclear physics
High Energy Physics - Experiment (hep-ex)
High Energy Physics - Phenomenology (hep-ph)
0103 physical sciences
Effective field theory
Nuclear Experiment (nucl-ex)
Nuclear Experiment
010306 general physics
Physics
010308 nuclear & particles physics
Observable
Gluon
High Energy Physics - Phenomenology
Soft-collinear effective theory
High Energy Physics::Experiment
Subatomic particle
Glauber
Coherence (physics)
Subjects
Details
- ISSN :
- 10797114 and 00319007
- Volume :
- 119
- Database :
- OpenAIRE
- Journal :
- Physical Review Letters
- Accession number :
- edsair.doi.dedup.....058b459741bc5396b71edc375d2e4a5d