scholarly journals Timepix3 Luminosity Determination of 13-TeV Proton–Proton Collisions at the ATLAS Experiment

2020 ◽  
Vol 67 (4) ◽  
pp. 609-616 ◽  
Author(s):  
Andre Sopczak
Keyword(s):  
Proton Proton ◽  
Proton Collisions ◽  
Atlas Experiment ◽  
Proton Proton Collisions

scholarly journals Timepix3 Luminosity Determination of 13 TeV Proton-Proton Collisions at the ATLAS Experiment

2020 ◽  
Vol 225 ◽  
pp. 01002
Author(s):  
Andreé Sopczak
Keyword(s):  
Simple Model ◽  
Number Of Clusters ◽  
Proton Proton ◽  
Proton Collisions ◽  
Atlas Experiment ◽  
Long Term Stability ◽  
Counting Methods ◽  
Proton Proton Collisions

Medipix and Timepix devices, installed in the ATLAS cavern at the LHC, have provided valuable complementary luminosity information. Results are presented from measurements with Timepix3 (TPX3) detectors. In contrast with previously employed frame-based data acquisition, the TPX3 detector remains active continuously, sending information on pixel hits as they occur. Hit- and cluster-counting methods were used for the luminosity determination of the LHC protonproton collisions. The LHC luminosity versus time is determined using these two methods and fitted to a simple model, which incorporates luminosity reduction from single bunch and beam-beam interactions. The precision of the luminosity determination could be improved by counting the number of clusters, instead of just pixel hits. The internal precision and long-term stability of the TPX3 luminosity measurement are below 0.5%. TPX3, owing to its 1.56 ns time-tagging, is able to resolve the time structure of the luminosity due to the collisions of individual proton bunches when integrated over an LHC fill.

scholarly journals Back-to-Back Isolated Photon-Quarkonium Production at the LHC and the Transverse-Momentum-Dependent Distributions of the Gluons in the Proton

2016 ◽  
Vol 40 ◽  
pp. 1660015 ◽  
Author(s):  
J. P. Lansberg
Keyword(s):  
Transverse Momentum ◽  
Experimental Determination ◽  
Heavy Quarkonia ◽  
Proton Proton ◽  
Transverse Momentum Dependent ◽  
Proton Collisions ◽  
Quarkonium Production ◽  
Linearly Polarized ◽  
Proton Proton Collisions

The study of isolated heavy quarkonia, such as [Formula: see text] and [Formula: see text], produced in association with a photon in proton-proton collisions at the LHC, is probably the optimal way to get right away a first experimental determination of two gluon transverse-momentum-dependent distribution (TMDs) in an unpolarized proton, [Formula: see text] and [Formula: see text], the latter giving the distribution of linearly polarized gluons. To substantiante this, we calculate the transverse-momentum-dependent effects that arise in the process under study and discuss the feasibility of their measurements.

scholarly journals On the precise determination of the Tsallis parameters in proton–proton collisions at LHC energies

2018 ◽  
Vol 45 (5) ◽  
pp. 055001 ◽  
Author(s):  
T Bhattacharyya ◽  
J Cleymans ◽  
L Marques ◽  
S Mogliacci ◽  
M W Paradza
Keyword(s):  
Precise Determination ◽  
Proton Proton ◽  
Proton Collisions ◽  
Proton Proton Collisions
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