Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Observing Higgs in weak boson fusion with forward jet tagging at the CERN CMS experiment
Download
119515.pdf
Date
2002
Author
Yıldız, Hatice Duran
Metadata
Show full item record
Item Usage Stats
169
views
0
downloads
Cite This
The experimental observation of Higgs boson will be fundamental for a better understanding of the electroweak symmetry breaking mechanism. In this thesis the Standard Model Higgs boson decaying to a WW or ZZ pair in the weak boson fusion channel is studied for the LHC CMS experiment at CERN. This study utilizes the PYTHIA Monte Carlo event generator and the CMS detector simulation (CMS JET). Throughout this work, the observability of Higgs signal in the wide mass range is explored through WW -> lujj, ZZ ->? lljj and ZZ -> llvv final states. In the analysis scheme the weak bosons from their decay products are first reconstructed which are then combined to look at the Higgs signal. The differences in the kinematics and the characteristics of Higgs production with forward jets in the weak boson fusion process are used to optimize the signal over background ratio. It is shown that the forward jet tagging together with the central jet veto reduces the large QCD W/Z + jets and the top backgrounds enormously. uiThe significant signals are obtained for H ->? WW and H -* ZZ. In the H -»? WW -¥ Ivjj and H - ». ZZ -» JZjj channels the Higgs signal is clearly seen with a good mass peak. In the H - >? ZZ -> Wi/v channel no mass peak can be recontructed, but the signal can be detected in the missing Et spectrum. The required luminosity for the observation of the Higgs boson within the mass range of 300-800 GeV is shown to be 10 to 20 fb~l with a signal significance of five standard deviation
Subject Keywords
Higgs bosons
,
Bosons
,
CERN
,
LHC
,
CMS
,
Experiment
,
Weak boson fusion
,
Forward jets
URI
https://hdl.handle.net/11511/12797
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
Study of high mass Higgs using pp -> qqH
Yildiz, HD; Zeyrek, Mehmet Tevfik (2003-08-01)
The observability of the Higgs signal in the mass range of 200-800 GeV is investigated in the weak boson fusion channel at the CMS experiment at LHC. The weak boson fusion channel is characterized by two final state jets at large pseudorapidity. The forward calorimeter plays a key role in detecting these jets. The significant signals are obtained for H --> WW --> lvjj, H --> ZZ --> lljj and H --> ZZ --> llvv. Importance of the forward jet tagging and the central jet veto is emphasized to extract the signal ...
New energy definition for higher-curvature gravities
Deser, S.; Tekin, Bayram (2007-04-01)
We propose a novel but natural definition of conserved quantities for gravity models of quadratic and higher order in curvature. Based on the spatial asymptotics of curvature rather than of metric, it avoids the more egregious problems-such as zero-energy '' theorems '' and failure in flat backgrounds-in this fourth-derivative realm. In D > 4, the present expression indeed correctly discriminates between second-derivative Gauss-Bonnet and generic, fourth-derivative actions.
Observation of Higgs Boson Decay to Bottom Quarks
Sirunyan, A.M.; et. al. (2018-09-01)
The observation of the standard model (SM) Higgs boson decay to a pair of bottom quarks is presented. The main contribution to this result is from processes in which Higgs bosons arc produced in association with a W or Z boson (VH), and are searched for in final states including 0, 1, or 2 charged leptons and two identified bottom quark jets. The results from the measurement of these processes in a data sample recorded by the CMS experiment in 2017, comprising 41.3 fb(-1) of proton-proton collisions at root...
Measurement of the transverse momentum distribution ofWbosons inppcollisions ats=7 TeVwith the ATLAS detector
Aad, G.; et. al. (American Physical Society (APS), 2012-1-18)
This paper describes a measurement of the W boson transverse momentum distribution using ATLAS pp collision data from the 2010 run of the LHC at ffiffi s p ¼ 7 TeV, corresponding to an integrated luminosity of about 31 pb 1. Events form both W ! e and W ! are used, and the transverse momentum of the W candidates is measured through the energy deposition in the calorimeter from the recoil of the W. The resulting distributions are unfolded to obtain the normalized differential cross sections as a function ...
Spontaneous symmetry breaking and higgs mechanism
Kahraman, Işınsu; Turan, İsmail; Department of Physics (2017)
The relevance of Higgs mechanism to nature has been verified recently by two experiments, CMS and ATLAS at Large Hadron Collider. Therefore, a detailed understanding of the mechanismis mportant more than ever.The details of Higgs potential, its stability and mass generation mechanism are going to be explored and the Higgs particle which is the quantum fluctuation of the field will be discussed within the sponteneous symmetry breaking notion. The one loop corrections to the effective potential for various toy m...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
H. D. Yıldız, “Observing Higgs in weak boson fusion with forward jet tagging at the CERN CMS experiment,” Ph.D. - Doctoral Program, Middle East Technical University, 2002.