Abstract
Abstract This paper describes measurements of the sum of the transverse energy of particles as a function of particle pseudorapidity, η, in proton-proton collisions at a centre-of-mass energy, $ \sqrt{s}=7 $ TeV using the ATLAS detector at the Large Hadron Collider. The measurements are performed in the region |η| < 4.8 for two event classes: those requiring the presence of particles with a low transverse momentum and those requiring particles with a significant transverse momentum. In the second dataset measurements are made in the region transverse to the hard scatter. The distributions are compared to the predictions of various Monte Carlo event generators, which generally tend to underestimate the amount of transverse energy at high |η|.
Highlights
To be sensitive to rare processes it is necessary to run the LHC at high instantaneous luminosities, meaning that multiple proton-proton interactions are very likely to occur each time the proton bunches collide
This paper describes measurements of the sum of the transverse energy of particles as a fun√ction of particle pseudorapidity, η, in proton-proton collisions at a centreof-mass energy, s = 7 TeV using the ATLAS detector at the Large Hadron Collider
It is essential that the Monte Carlo event generators used to simulate these processes have an accurate description of the soft particle kinematics in inclusive proton-proton interactions over the entire acceptance of the LHC experiments, such that reliable comparisons can be made between theoretical predictions and the data for any process of interest
Summary
Events are selected and variables defined using calibrated detector-level quantities. In order to compare the corrected data with predictions from Monte Carlo event generators without passing the events through a simulation of the ATLAS detector, it is necessary to define variables at the particle-level. In addition the mean ΣET over all events, per unit η–φ, is measured as a function of |η|. This is denoted as the transverse energy density (ETdensity) and is defined as d2ΣET dηdφ. ∆φ is the azimuthal separation between the leading jet and a given particle This region of phase space contains limited particle production from the hard parton-parton interaction and is most sensitive to the underlying event
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