scholarly journals Measurement of jet substructure observables and jet fragmentation properties using the ATLAS detector

2020 ◽  
Vol 309-311 ◽  
pp. 1-8
Author(s):  
T. Lenz
Keyword(s):  
Atlas Detector ◽  
Jet Substructure ◽  
Jet Fragmentation

scholarly journals Search for $$ t\overline{t} $$ resonances in fully hadronic final states in pp collisions at $$ \sqrt{s} $$ = 13 TeV with the ATLAS detector

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
G. Aad ◽  
◽  
B. Abbott ◽  
D. C. Abbott ◽  
A. Abed Abud ◽  
...  
Keyword(s):  
Production Cross ◽  
Hadron Collider ◽  
Top Quarks ◽  
Atlas Detector ◽  
Proton Collision ◽  
Large Radius ◽  
Final States ◽  
Jet Substructure ◽  
High Transverse Momentum ◽  
Hadronic Final States

Abstract This paper presents a search for new heavy particles decaying into a pair of top quarks using 139 fb−1 of proton-proton collision data recorded at a centre-of-mass energy of $$ \sqrt{s} $$ s = 13 TeV with the ATLAS detector at the Large Hadron Collider. The search is performed using events consistent with pair production of high-transverse-momentum top quarks and their subsequent decays into the fully hadronic final states. The analysis is optimized for resonances decaying into a $$ t\overline{t} $$ t t ¯ pair with mass above 1.4 TeV, exploiting a dedicated multivariate technique with jet substructure to identify hadronically decaying top quarks using large-radius jets and evaluating the background expectation from data. No significant deviation from the background prediction is observed. Limits are set on the production cross-section times branching fraction for the new Z′ boson in a topcolor-assisted-technicolor model. The Z′ boson masses below 3.9 and 4.7 TeV are excluded at 95% confidence level for the decay widths of 1% and 3%, respectively.

scholarly journals Properties of jet fragmentation using charged particles measured with the ATLAS detector in pp collisions at s=13  TeV

2019 ◽  
Vol 100 (5) ◽  
Author(s):  
G. Aad ◽  
B. Abbott ◽  
D. C. Abbott ◽  
O. Abdinov ◽  
A. Abed Abud ◽  
...  
Keyword(s):  
Charged Particles ◽  
Atlas Detector ◽  
Pp Collisions ◽  
Jet Fragmentation

scholarly journals Jet fragmentation with the ATLAS detector

2014 ◽  
Vol 931 ◽  
pp. 433-437
Author(s):  
Martin Spousta
Keyword(s):  
Atlas Detector ◽  
Jet Fragmentation

scholarly journals Jet Substructure Measurements Sensitive to Soft QCD effects with the ATLAS Detector

2018 ◽  
Vol 192 ◽  
pp. 00007
Author(s):  
Gabriele Chiodini
Keyword(s):  
Atlas Detector ◽  
Jet Substructure ◽  
Heavy Particles ◽  
Proton Proton ◽  
Proton Collisions ◽  
Perturbative Regime ◽  
Proton Proton Collisions

Jet substructure observables are powerful tools for the identification of boosted heavy particles and for probing QCD at different energy scales in proton-proton collisions at the LHC. In this work three recent ATLAS measurements sensitive to soft QCD effects and performed with the use of jet substructures are described. Their are kt splitting scales, soft-drop jet masses and pull-jet angles. Some discrepancies between data and predictions are observed in the non-perturbative regime.

scholarly journals Overview of jet physics results from ALICE

2020 ◽  
Vol 235 ◽  
pp. 01002
Author(s):  
Filip Krizek
Keyword(s):  
Transverse Momentum ◽  
Heavy Ion ◽  
Jet Quenching ◽  
Jet Physics ◽  
Jet Substructure ◽  
Momentum Fraction ◽  
Complementary Information ◽  
Ion Collisions ◽  
Resolution Parameter ◽  
Jet Fragmentation

Recent results from jet shower-shape and substructure analyses done by the ALICE collaboration in central Pb–Pb collisions at √sNN = 2.76 TeV and in pp collisions at √s = 7 TeV are reviewed. The presented jet shower- shape observables are angularity g and transverse momentum dispersion pTD, which were studied for a small resolution parameter R = 0.2, track-based jets with a minimum constituent transverse momentum (pT) cut-off of 0.15 GeV/c. Jet substructure is explored for track-based anti-kT jets with R = 0.4 by means of iterative declustering and grooming techniques, which were used to measure the absolutely-normalized leading subjet momentum fraction zg and the number of hard splittings in the reclustered jet shower, nSD. These observables provide complementary information on the jet fragmentation and help to discriminate between different scenarios for medium-induced modifications of the parton shower in heavy-ion collisions due to jet quenching.

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