scholarly journals Measurement of Hadronic Event Shapes and Jet Substructure in Proton-Proton Collisions at 7.0 TeV Center-of-Mass Energy with the ATLAS Detector at the Large Hadron Collider

2012 ◽  
Author(s):  
David Wilkins Miller
Keyword(s):  
Hadron Collider ◽  
Center Of Mass ◽  
Atlas Detector ◽  
Jet Substructure ◽  
Mass Energy ◽  
Proton Proton ◽  
Hadronic Event ◽  
Proton Collisions ◽  
Center Of Mass Energy ◽  
Proton Proton Collisions

scholarly journals SEARCHES FOR SUPERSYMMETRY WITH THE ATLAS DETECTOR

2012 ◽  
Vol 27 (32) ◽  
pp. 1230033 ◽  
Author(s):  
G. REDLINGER
Keyword(s):  
Large Hadron Collider ◽  
Hadron Collider ◽  
Center Of Mass ◽  
Atlas Detector ◽  
Mass Energy ◽  
Future Directions ◽  
Proton Proton ◽  
Proton Collisions ◽  
Center Of Mass Energy ◽  
Proton Proton Collisions

This is a review of searches for supersymmetry (SUSY) with the ATLAS detector in proton–proton collisions at a center-of-mass energy of 7 TeV at the Large Hadron Collider (LHC) at CERN. The review covers results that have been published, or submitted for publication, up to September 2012, many of which cover the full 7 TeV data-taking period. No evidence for SUSY has been seen; some possibilities for future directions are discussed.

scholarly journals The CMS ECAL Upgrade for Precision Crystal Calorimetry at the HL-LHC

2018 ◽  
Vol 46 ◽  
pp. 1860074
Author(s):  
D. A. Petyt
Keyword(s):  
Hadron Collider ◽  
Center Of Mass ◽  
Electromagnetic Calorimeter ◽  
Mass Energy ◽  
Test Beam ◽  
Proton Proton ◽  
Proton Collisions ◽  
Center Of Mass Energy ◽  
Present Test ◽  
Proton Proton Collisions

The electromagnetic calorimeter (ECAL) of the Compact Muon Solenoid Experiment (CMS) is operating at the Large Hadron Collider (LHC) with proton-proton collisions at 13 TeV center-of-mass energy and at a bunch spacing of 25 ns. Upgrades are necessary for the High-Luminosity upgrade of the LHC (HL-LHC). We review the design and R&D studies for the CMS ECAL crystal calorimeter upgrade. We present test beam results of hadron irradiated PbWO4 crystals up to fluences expected at the HL-LHC. We also report on the R&D for the new readout and trigger electronics, which must be upgraded due to the increased trigger and latency requirements at the HL-LHC.

scholarly journals Gaugino production in proton-proton collisions at a center-of-mass energy of 8 TeV

2012 ◽  
Vol 2012 (10) ◽  
Author(s):  
Benjamin Fuks ◽  
Michael Klasen ◽  
David R. Lamprea ◽  
Marcel Rothering
Keyword(s):  
Center Of Mass ◽  
Mass Energy ◽  
Proton Proton ◽  
Proton Collisions ◽  
Center Of Mass Energy ◽  
8 Tev ◽  
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.

scholarly journals Measurement of $$K_S^0$$ and $$\Lambda ^0$$ production in $$t \bar{t}$$ dileptonic events in pp collisions at $$\sqrt{s} =$$ 7 TeV with the ATLAS detector

2019 ◽  
Vol 79 (12) ◽  
Author(s):  
G. Aad ◽  
◽  
B. Abbott ◽  
D. C. Abbott ◽  
O. Abdinov ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Hadron Collider ◽  
Atlas Detector ◽  
Final States ◽  
Centre Of Mass ◽  
Mass Energy ◽  
Proton Proton ◽  
Proton Collisions ◽  
Strange Particles ◽  
Proton Proton Collisions

AbstractMeasurements of $$K_S^0$$KS0 and $$\Lambda ^0$$Λ0 production in $$t\bar{t}$$tt¯ final states have been performed. They are based on a data sample with integrated luminosity of 4.6 $$\mathrm {fb}^{-1}$$fb-1 from proton–proton collisions at a centre-of-mass energy of 7 TeV, collected in 2011 with the ATLAS detector at the Large Hadron Collider. Neutral strange particles are separated into three classes, depending on whether they are contained in a jet, with or without a b-tag, or not associated with a selected jet. The aim is to look for differences in their main kinematic distributions. A comparison of data with several Monte Carlo simulations using different hadronisation and fragmentation schemes, colour reconnection models and different tunes for the underlying event has been made. The production of neutral strange particles in $$t\bar{t}$$tt¯ dileptonic events is found to be well described by current Monte Carlo models for $$K_S^0$$KS0 and $$\Lambda ^0$$Λ0 production within jets, but not for those produced outside jets.

scholarly journals Search for the radiative $$ {\Xi}_b^{-} $$ → Ξ−γ decay

2022 ◽  
Vol 2022 (1) ◽  
Author(s):  
◽  
R. Aaij ◽  
A. S. W. Abdelmotteleb ◽  
C. Abellán Beteta ◽  
T. Ackernley ◽  
...  
Keyword(s):  
Confidence Level ◽  
Radiative Decay ◽  
Center Of Mass ◽  
Mass Energy ◽  
Proton Proton ◽  
Proton Collisions ◽  
Center Of Mass Energy ◽  
Upper Limit ◽  
Using Data ◽  
Proton Proton Collisions

Abstract The first search for the rare radiative decay $$ {\Xi}_b^{-} $$ Ξ b − → Ξ−γ is performed using data collected by the LHCb experiment in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb−1. The $$ {\Xi}_b^{-} $$ Ξ b − → Ξ−J/ψ channel is used as normalization. No $$ {\Xi}_b^{-} $$ Ξ b − → Ξ−γ signal is found and an upper limit of $$ \mathcal{B} $$ B ($$ {\Xi}_b^{-} $$ Ξ b − → Ξ−γ) < 1.3 × 10−4 at 95% confidence level is obtained.

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