scholarly journals A REVIEW OF QUANTUM GRAVITY AT THE LARGE HADRON COLLIDER

2010 ◽  
Vol 25 (19) ◽  
pp. 1553-1579 ◽  
Author(s):  
XAVIER CALMET
Keyword(s):  
Black Holes ◽  
Large Hadron Collider ◽  
Quantum Gravity ◽  
Hadron Collider ◽  
Planck Mass ◽  
Small Quantum ◽  
Recent Developments ◽  
Dimensional Models

The aim of this paper is to review the recent developments in the phenomenology of quantum gravity at the Large Hadron Collider. We shall pay special attention to four-dimensional models which are able to lower the reduced Planck mass to the TeV region and compare them to models with a large extra-dimensional volume. We then turn our attention to reviewing the emission of gravitons (massless or massive) at the LHC and to the production of small quantum black holes.

Recent Developments of Micropattern Detectors

2014 ◽  
pp. 156-194
Keyword(s):  
Large Hadron Collider ◽  
Visible Light ◽  
Parallel Plate ◽  
Hadron Collider ◽  
Special Focus ◽  
Large Area ◽  
Special Place ◽  
Recent Developments ◽  
New Generation ◽  
Detector Technology

In this chapter, the exciting developments in micropattern detectors in recent years are described. This includes GEM and MICROMEGAS detectors combined with micropixel readout, some peculiar designs of GEM and GEM-like detectors sensitive to UV and visible light, large area (>1m2) GEM and MICROMEGAS prototypes developed for the upgrades of the experiments at the large hadron collider, etc. A special focus is put on a new generation of spark-proof micropattern detectors, using resistive electrodes instead of traditional metallic ones. These detectors operate as ordinary micropattern detectors. However, in the case of occasional sparks, their current is limited by the resistivity of the electrodes so that the energy of the discharge is reduced by several orders of magnitude. Various designs of such detectors have been developed and successfully tested, including resistive GEM, resistive MICROMEGAS, resistive MSGC, etc. Among this family of detectors, a special place belongs to resistive parallel-plate micropattern detectors allowing one to achieve at the same time excellent spatial (38 µm) and time (77 ps) resolutions. Finally, the potential of multilayer detector technology for further optimization of the detector operation is discussed.

scholarly journals SUPERSYMMETRY VERSUS BLACK HOLES AT THE LHC

2008 ◽  
Vol 23 (35) ◽  
pp. 2987-2996 ◽  
Author(s):  
ARUNAVA ROY ◽  
MARCO CAVAGLIÀ
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Mass Spectrum ◽  
Large Hadron Collider ◽  
Extra Dimensions ◽  
Hadron Collider ◽  
New Physics ◽  
Event Shape ◽  
High Transverse Momentum ◽  
Dilepton Invariant Mass

Supersymmetry and extra dimensions are the two most promising candidates for new physics at the TeV scale. Supersymmetric particles or extra-dimensional effects could soon be observed at the Large Hadron Collider. We propose a simple but effective method to discriminate the two models: the analysis of isolated leptons with high transverse momentum. Black hole events are simulated with the CATFISH black hole generator. Supersymmetry simulations use a combination of PYTHIA and ISAJET, the latter providing the mass spectrum. Our results show that the measure of the dilepton invariant mass provides a promising signature to differentiate supersymmetry and black hole events at the Large Hadron Collider. Analysis of event-shape variables and multilepton events complement and strengthen this conclusion.

scholarly journals SIGNATURES FOR BLACK HOLE PRODUCTION FROM HADRONIC OBSERVABLES AT THE LARGE HADRON COLLIDER

2007 ◽  
Vol 16 (03) ◽  
pp. 841-851 ◽  
Author(s):  
THOMAS J. HUMANIC ◽  
BENJAMIN KOCH ◽  
HORST STÖCKER
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Large Hadron Collider ◽  
Particle Tracking ◽  
Extra Dimensions ◽  
Large Extra Dimensions ◽  
Hadron Collider ◽  
Hierarchy Problem ◽  
Tracking Detector ◽  
Weak Forces

The concept of Large Extra Dimensions (LED) provides a way of solving the Hierarchy Problem which concerns the weakness of gravity compared with the strong and electro-weak forces. A consequence of LED is that miniature Black Holes (mini-BHs) may be produced at the Large Hadron Collider in p + p collisions. The present work uses the CHARYBDIS mini-BH generator code to simulate the hadronic signal which might be expected in a mid-rapidity particle tracking detector from the decay of these exotic objects if indeed they are produced. An estimate is also given for Pb + Pb collisions.

scholarly journals SIGNATURES OF SINGLET NEUTRINOS IN LARGE EXTRA DIMENSIONS AT THE LHC

2009 ◽  
Vol 24 (28n29) ◽  
pp. 5173-5215 ◽  
Author(s):  
DOUGLAS M. GINGRICH
Keyword(s):  
Higgs Boson ◽  
Large Hadron Collider ◽  
Detailed Analysis ◽  
Extra Dimensions ◽  
Large Extra Dimensions ◽  
Hadron Collider ◽  
Planck Scale ◽  
Neutrino Masses ◽  
The Status ◽  
Dimensional Models

It is a challenge to explain why neutrinos are so light compared to other leptons. Small neutrino masses can be explained if right-handed fermions propagate in large extra dimensions. Fermions propagating in the bulk would have implications on Higgs boson decays. If the Higgs boson is discovered at the Large Hadron Collider (LHC), a detailed analysis may reveal the presence of large extra dimensions. This paper reviews the status of large extra-dimensional models in the context of the current limits on Higgs boson masses and the fundamental Planck scale in extra dimensions.

scholarly journals On the Higgs mass fine-tuning problem with multi-Higgs doublet models

2019 ◽  
Vol 34 (05) ◽  
pp. 1950025 ◽  
Author(s):  
Nabarun Chakrabarty ◽  
Indrani Chakraborty
Keyword(s):  
Large Hadron Collider ◽  
Degrees Of Freedom ◽  
Higgs Mass ◽  
Hadron Collider ◽  
Mass Term ◽  
Higgs Doublet ◽  
Fine Tuning ◽  
Divergent Term ◽  
Dimensional Models ◽  
Manageable Level

With no conclusive signal till date of the minimal supersymmetric and extra-dimensional models at the Large Hadron Collider (LHC), the issue of naturalness of the Higgs mass still calls for attention. One way to achieve that is to introduce additional bosonic degrees of freedom and rely on fine-tuning thereafter. That is, to arrange for a cancellation between various parameters so that the coefficient of the quadratically divergent term in the Higgs mass is vanishing or small to a manageable level. In this work, we explore the possibility of doing so using two- and three-Higgs doublet models. We consider different versions of the same and fold in various relevant constraints accordingly. The study reveals that the quadratically divergent mass term of the 125 GeV Higgs can be exactly canceled in most of the models considered here. However, the same does not hold for the nonstandard scalars owing to the applied constraints.

scholarly journals Quasistable black holes at the Large Hadron Collider

2002 ◽  
Vol 66 (10) ◽  
Author(s):  
Sabine Hossenfelder ◽  
Stefan Hofmann ◽  
Marcus Bleicher ◽  
Horst Stöcker
Keyword(s):  
Black Holes ◽  
Large Hadron Collider ◽  
Hadron Collider
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