scholarly journals Recent progress on jet substructure theory

2020 ◽  
Vol 235 ◽  
pp. 05001
Author(s):  
Zhong-Bo Kang
Keyword(s):  
Effective Theory ◽  
Jet Substructure ◽  
Coupling Constant ◽  
Proton Proton ◽  
Proton Collisions ◽  
Qcd Factorization ◽  
Soft Collinear Effective Theory ◽  
Logarithmic Corrections ◽  
Inclusive Jet Production ◽  
Proton Proton Collisions

In these proceedings, we review recent theoretical progress on jet substructure at the colliders. Focusing on two observables – jet mass and groomed jet radius, we perform theoretical computations for jets measured in the single inclusive jet production in proton-proton collisions, pp → jet + X. We consider both standard ungroomed jets as well as soft-drop groomed jets. Within the Soft Collinear Effective Theory (SCET), we establish QCD factorization theorems which allow for the joint resummation of several classes of logarithmic corrections to all orders in the strong coupling constant. We present numerical results and compare with the available data from the LHC.

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 The renormalization scale problem and novel perspectives for QCD

2015 ◽  
Vol 39 ◽  
pp. 1560108
Author(s):  
Stanley J. Brodsky
Keyword(s):  
Renormalization Scale ◽  
High Transverse Momentum ◽  
Proton Proton ◽  
Direct Production ◽  
Proton Collisions ◽  
Qcd Factorization ◽  
Quarkonium Production ◽  
Proton Proton Collisions ◽  
Principle Of Maximum

I discuss a number of novel tests of QCD, measurements which can illuminate fundamental features of hadron physics. These include the origin of the “ridge” in proton-proton collisions; the production of the Higgs at high [Formula: see text]; the role of digluon-initiated processes for quarkonium production; flavor-dependent anti-shadowing; the effect of nuclear shadowing on QCD sum rules; direct production of hadrons at high transverse momentum; and leading-twist lensing corrections; and the breakdown of perturbative QCD factorization. I also review the “Principle of Maximum Conformalit” (PMC) which systematically sets the renormalization scale order-by-order in pQCD, independent of the choice of renormalization scheme, thus eliminating an unnecessary theoretical uncertainty.

scholarly journals Search for high-mass Zγ resonances in proton–proton collisions at s=8 and 13 TeV using jet substructure techniques

2017 ◽  
Vol 772 ◽  
pp. 363-387 ◽  
Author(s):  
A.M. Sirunyan ◽  
A. Tumasyan ◽  
W. Adam ◽  
E. Asilar ◽  
T. Bergauer ◽  
...  
Keyword(s):  
High Mass ◽  
Jet Substructure ◽  
Proton Proton ◽  
Proton Collisions ◽  
Proton Proton Collisions

scholarly journals Measurement of b jet shapes in proton-proton collisions at $$ \sqrt{s} $$ = 5.02 TeV

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
A. M. Sirunyan ◽  
◽  
A. Tumasyan ◽  
W. Adam ◽  
F. Ambrogi ◽  
...  
Keyword(s):  
Center Of Mass ◽  
Angular Distance ◽  
Charged Hadron ◽  
Jet Substructure ◽  
Proton Proton ◽  
Proton Collisions ◽  
Center Of Mass Energy ◽  
Jet Shapes ◽  
Proton Proton Collisions ◽  
Jet Axis

Abstract We present the first study of charged-hadron production associated with jets originating from b quarks in proton-proton collisions at a center-of-mass energy of 5.02 TeV. The data sample used in this study was collected with the CMS detector at the CERN LHC and corresponds to an integrated luminosity of 27.4 pb−1. To characterize the jet substructure, the differential jet shapes, defined as the normalized transverse momentum distribution of charged hadrons as a function of angular distance from the jet axis, are measured for b jets. In addition to the jet shapes, the per-jet yields of charged particles associated with b jets are also quantified, again as a function of the angular distance with respect to the jet axis. Extracted jet shape and particle yield distributions for b jets are compared with results for inclusive jets, as well as with the predictions from the pythia and herwig++ event generators.

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