scholarly journals Jet observables without jet algorithms

2014 ◽  
Vol 2014 (4) ◽  
Author(s):  
Daniele Bertolini ◽  
Tucker Chan ◽  
Jesse Thaler
Keyword(s):  
Jet Algorithms ◽  
Jet Observables

scholarly journals Measuring Multijet Structure of Hadronic Energy Flow or, What is a jet?

1997 ◽  
Vol 12 (30) ◽  
pp. 5411-5529 ◽  
Author(s):  
Fyodor V. Tkachov
Keyword(s):  
Energy Flow ◽  
Mass Spectra ◽  
Analytical Control ◽  
Final States ◽  
C Algebra ◽  
Approximation Errors ◽  
Basic Class ◽  
Jet Algorithms ◽  
Hadronic Energy ◽  
Optimal Recombination

Ambiguities of jet algorithms are reinterpreted as instability wrt small variations of input. Optimal stability occurs for observables possessing property of calorimetric continuity (C-continuity) predetermined by kinematical structure of calorimetric detectors. The so-called C-correlators form a basic class of such observables and fit naturally into QFT framework, allowing systematic theoretical studies. A few rules generate other C-continuous observables. The resulting C-algebra correctly quantifies any feature of multijet structure such as the "number of jets" and mass spectra of "multijet substates." The new observables are physically equivalent to traditional ones but can be computed from final states bypassing jet algorithms which reemerge as a tool of approximate computation of C-observables from data with all ambiguities under analytical control and an optimal recombination criterion minimizing approximation errors.

scholarly journals Measurement of the strong coupling αS from four-jet observables in e+e- annihilation

2006 ◽  
Vol 47 (2) ◽  
Author(s):  
G. Abbiendi ◽  
◽  
C. Ainsley ◽  
P.F. Åkesson ◽  
G. Alexander ◽  
...  
Keyword(s):  
Strong Coupling ◽  
Jet Observables

scholarly journals ON ANGULAR ORDERING IN MEDIUM-INDUCED RADIATION

2011 ◽  
Vol 20 (07) ◽  
pp. 1600-1604
Author(s):  
KONRAD TYWONIUK
Keyword(s):  
Perturbative Qcd ◽  
First Principles ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Differential Spectrum ◽  
Opening Angle ◽  
Gluon Emission ◽  
Collinear Singularity ◽  
Ion Collisions ◽  
Jet Observables

As an attempt to understand color coherence effects in medium from first principles, we calculate the double differential spectrum of medium-induced gluon emission off a quark–antiquark antenna in the framework of perturbative QCD. Within this setup we find a soft singularity, analogous to the vacuum spectrum, yet, as opposed to the vacuum, the collinear singularity is regulated by the pair opening angle, leading to a strict anti-angular ordering. We comment on the possible consequences of this new contribution for reconstructed jet observables in heavy-ion collisions.

scholarly journals Predictions for boson-jet observables and fragmentation function ratios from a hybrid strong/weak coupling model for jet quenching

2016 ◽  
Vol 2016 (3) ◽  
Author(s):  
Jorge Casalderrey-Solana ◽  
Doga Can Gulhan ◽  
José Guilherme Milhano ◽  
Daniel Pablos ◽  
Krishna Rajagopal
Keyword(s):  
Fragmentation Function ◽  
Weak Coupling ◽  
Coupling Model ◽  
Jet Quenching ◽  
Jet Observables

scholarly journals Soft functions for generic jet algorithms and observables at hadron colliders

2017 ◽  
Vol 2017 (7) ◽  
Author(s):  
Daniele Bertolini ◽  
Daniel Kolodrubetz ◽  
Duff Neill ◽  
Piotr Pietrulewicz ◽  
Iain W. Stewart ◽  
...  
Keyword(s):  
Hadron Colliders ◽  
Jet Algorithms

scholarly journals Jet tomography in high-energy nuclear collisions

2019 ◽  
Vol 206 ◽  
pp. 04004 ◽  
Author(s):  
Ben-Wei Zhang ◽  
Guo-Yang Ma ◽  
Wei Dai ◽  
Sa Wang ◽  
Shan-Liang Zhang
Keyword(s):  
Energy Loss ◽  
Heavy Ion ◽  
High Energy ◽  
Jet Quenching ◽  
Parton Energy Loss ◽  
Matrix Elements ◽  
Leading Order ◽  
Nuclear Collisions ◽  
Ion Collisions ◽  
Jet Observables

When an energetic parton traversing the QCD medium, it may suffer multiple scatterings and lose energy. This jet quenching phenomenon may lead to the suppression of leading hadron productions as well as medium modifications of full jet observables in heavy-ion collisions. In this talk we discuss the nuclear modificationfactors and yield ratios of identified meson such as η, ρ0, φ, ω, and $ K_{\rm{S}}^0 $ as well as π meson at large pT in A+A collisions at the next to-leading order (NLO) with high-twist approach of parton energy loss. Then we discuss a newly developed formalism of combing NLO matrix elements and parton shower (PS) for initial hard production with parton energy loss in the QGP, and its application in investigating massivegauge boson(Z0/W±)tagged jet productions and b $ \bar {b} $ dijet correlations in Pb+Pb at the LHC.

scholarly journals Medium response to jets in heavy ion collisions

2018 ◽  
Vol 172 ◽  
pp. 05009
Author(s):  
Yasuki Tachibana
Keyword(s):  
Heavy Ion Collisions ◽  
Recent Progress ◽  
Heavy Ion ◽  
Jet Quenching ◽  
Short Overview ◽  
Ion Collisions ◽  
Jet Observables ◽  
Work Done

A short overview on recent progress in studies of medium response to jet quenching in heavy ion collisions is presented. We show the typical features of medium response and give comment on their connection to jet observables by introducing the work done by the author and collaborators as an example.

scholarly journals Improving the understanding of jet grooming in perturbation theory

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Andrew J. Larkoski
Keyword(s):  
Perturbation Theory ◽  
Phase Space ◽  
Cross Section ◽  
Power Counting ◽  
Numerical Results ◽  
Factorization Theorem ◽  
Jet Physics ◽  
Leading Order ◽  
Physics Program ◽  
Jet Observables

Abstract Jet grooming has emerged as a necessary and powerful tool in a precision jet physics program. In this paper, we present three results on jet grooming in perturbation theory, focusing on heavy jet mass in e+e−→ hadrons collisions, groomed with the modified mass drop tagger. First, we calculate the analytic cross section at leading-order. Second, using the leading-order result and numerical results through next-to-next-to-leading order, we show that cusps in the distribution on the interior of phase space at leading-order are softened at higher orders. Finally, using analytic and numerical results, we show that terms that violate the assumptions of the factorization theorem for groomed jet mass are numerically much smaller than expected from power counting. These results provide important information regarding the convergence of perturbation theory for groomed jet observables and reliable estimates for residual uncertainties in a precision calculation.

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