Search for Dark Matter Produced in Association with a Higgs Boson Decaying to B ̄b Using 36 Fb−1 of Pp Collisions at √s
Author: Daniel Isaac Narrias Villar
Publisher:
Published: 2018
Total Pages:
ISBN-13:
DOWNLOAD EBOOKPosts
Search for Dark Matter Produced in Association with a Higgs Boson Decaying to Two Bottom Quarks in Pp Collisions at S
Author:
Publisher:
Published: 2016
Total Pages:
ISBN-13:
DOWNLOAD EBOOKThis study reports on a search for dark matter pair production in association with a Higgs boson decaying to a pair of bottom quarks, using data from 20.3 fb–1 of pp collisions at a center-of-mass energy of 8 TeV collected by the ATLAS detector at the LHC. The decay of the Higgs boson is reconstructed as a high-momentum bb¯ system with either a pair of small-radius jets, or a single large-radius jet with substructure. The observed data are found to be consistent with the expected Standard Model backgrounds. Model-independent upper limits are placed on the visible cross sections for events with a Higgs boson decaying into bb¯ and large missing transverse momentum with thresholds ranging from 150 to 400 GeV. Results are interpreted using a simplified model with a Z' gauge boson decaying into different Higgs bosons predicted in a two-Higgs-doublet model, of which the heavy pseudoscalar Higgs decays into a pair of dark matter particles. Exclusion limits are also presented for the mass scales of various effective field theory operators that describe the interaction between dark matter particles and the Higgs boson.
Phenomena Beyond the Standard Model: What Do We Expect for New Physics to Look Like?
Author: Roman Pasechnik
Publisher: Frontiers Media SA
Published: 2020-09-03
Total Pages: 180
ISBN-13: 2889639908
DOWNLOAD EBOOKThis eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact.
Search for Production of Dark Matter in Association with a Higgs Boson Decaying to Bb with the ATLAS Detector
Author: Matthew Baca
Publisher:
Published: 2018
Total Pages: 0
ISBN-13:
DOWNLOAD EBOOKUsing 3.2 fb^-1 of sqrt(s) =13TeV proton-proton data collected in 2015 with the ATLAS detector at the Large Hadron Collider, new limits were imposed on the associated production of Dark Matter with a 125GeV Higgs boson which decays into a pair of b-quarks. The final state of the signal is a pair of b-quark jets and large Missing Transverse Momentum attributed to the DM escaping the detector. The dominant backgrounds were simulated. These were subject to selection requirements to increase signal to background ratio. Three regions were designated based on the number of leptons in the event. 0 lepton events made up the signal region. Events with 1 and 2 leptons were control regions. Similar selection requirements were applied to the control regions as in the signal region, in order to examine a similar phase space. A blinding region was established in the 0 lepton region over the mbb distribution to mask where a reconstructed 125GeV Higgs boson would appear. The control regions and the side bands in the signal region were then fit to the mbb data distribution. Unblinding of the signal region did not result in the discovery of the decay channel, but allowed limits to be imposed.
Hip Surgeries
Author: Nahum Rosenberg
Publisher: BoD – Books on Demand
Published: 2019-04-24
Total Pages: 114
ISBN-13: 1838802355
DOWNLOAD EBOOKHip surgery became a benchmark for large joint surgery development. Surgical techniques for the treatment of degenerative, developmental, and traumatic hip pathologies became a challenge, aiming to restore the patients' ambulation in otherwise disabling pathological conditions of the hip joint. In this book the authors present an overview of the pathological basis of the diseased hip and the currently available surgical solutions that provide long-term relief using a reconstructing surgical approach.The book aims to expose young orthopedic surgeons to exciting and continuously developing information on hip surgery, and experienced colleagues will benefit from concise information that might be beneficial in routine surgical activity.
Searches for Dijet Resonances
Author: Lydia Audrey Beresford
Publisher: Springer
Published: 2018-09-04
Total Pages: 175
ISBN-13: 331997520X
DOWNLOAD EBOOKThis book addresses one of the most intriguing mysteries of our universe: the nature of dark matter. The results presented here mark a significant and substantial contribution to the search for new physics, in particular for new particles that couple to dark matter. The first analysis presented is a search for heavy new particles that decay into pairs of hadronic jets (dijets). This pioneering analysis explores unprecedented dijet invariant masses, reaching nearly 7 TeV, and sets constraints on several important new physics models. The two subsequent analyses focus on the difficult low dijet mass region, down to 200 GeV, and employ a novel technique to efficiently gather low-mass dijet events. The results of these analyses transcend the long-standing constraints on dark matter mediator particles set by several existing experiments.
Search for Dark Matter Produced in Association with Hadronically Decaying Standard Model Bosons Using 36 Fb-1 of Pp Collisions at the ATLAS Detector
Author: Stanislav Suchek
Publisher:
Published: 2018
Total Pages:
ISBN-13:
DOWNLOAD EBOOKParticle Physics Reference Library
Author: Herwig Schopper
Publisher: Springer Nature
Published: 2020
Total Pages: 632
ISBN-13: 3030382079
DOWNLOAD EBOOKThis first open access volume of the handbook series contains articles on the standard model of particle physics, both from the theoretical and experimental perspective. It also covers related topics, such as heavy-ion physics, neutrino physics and searches for new physics beyond the standard model. A joint CERN-Springer initiative, the "Particle Physics Reference Library" provides revised and updated contributions based on previously published material in the well-known Landolt-Boernstein series on particle physics, accelerators and detectors (volumes 21A, B1,B2,C), which took stock of the field approximately one decade ago. Central to this new initiative is publication under full open access
Search for Dark Matter Produced in Association with a Higgs Boson Decaying to a Pair of Bottom Quarks in Proton-proton Collisions at $\sqrt˜s}
Author: Albert M. Sirunyan
Publisher:
Published: 2018
Total Pages:
ISBN-13:
DOWNLOAD EBOOKSearch for Dark Matter Produced in Association with Hadronically Decaying Standard Model Bosons Using Using 36 Fb-1 of Pp Collisions at the ATLAS Detector
Author: Stanislav Suchek
Publisher:
Published: 2018
Total Pages:
ISBN-13:
DOWNLOAD EBOOK