A Study Of Missing Transverse Energy In Minimum Bias Events With In Time Pile Up At The Large Hadron Collider Using The Atlas Detector And S
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A Study of Missing Transverse Energy in Minimum Bias Events with In-time Pile-up at the Large Hadron Collider Using the ATLAS Detector and S
A sample of? L dt = 3.67 pb{-1} of minimum bias events observed using the ATLAS detector at the Large Hadron Collider at s=7 TeV is analyzed for Missing Transverse Energy (MET) response in the presence of in-time pile-up. We find that the MET resolution (ox, y) is consistent with a simple model of the detector response for minimum bias events, scaling with respect to the sum of the scalar energy ($\sum E_\text{T}$) as $\sigma_\text{X, Y}=A\sqrt{\sum E_\text{T} }$. This behavior is observed in the presence of in-time pile-up and does not vary with global calibration schemes. We find a bias in the mean ($\mu_\text{X, Y}$) of the MET that is linear with respect to $\sum E_\text{T}$, leading to an asymmetry in the $\phi_\text{X, Y}$ distribution of the MET. We propose an explanation for this problem in terms of a misalignment of the nominal center of the ATLAS detector with respect to its real center. We contrast the data with a Monte Carlo sample produced using PYTHIA. We find that the resolution, bias and asymmetry are all approximately reproduced in simulation.
The Large Hadron Collider
This comprehensive volume summarizes and structures the multitude of results obtained at the LHC in its first running period and draws the grand picture of today’s physics at a hadron collider. Topics covered are Standard Model measurements, Higgs and top-quark physics, flavour physics, heavy-ion physics, and searches for supersymmetry and other extensions of the Standard Model. Emphasis is placed on overview and presentation of the lessons learned. Chapters on detectors and the LHC machine and a thorough outlook into the future complement the book. The individual chapters are written by teams of expert authors working at the forefront of LHC research.