Recent results obtained by the KLOE experiment operating at DA $\ Phi $ NE, the Frascati $\ phi $... more Recent results obtained by the KLOE experiment operating at DA $\ Phi $ NE, the Frascati $\ phi $-factory, are presented. They mainly concern neutral kaon decays including the $ K_L $ dominant branching ratios, the $ K_L $ lifetime and the extraction of the $ CKM $ parameter $ V_ {us} $ from the $ K_L $ semileptonic decays and lifetime. The best world upper limit on $ K_S\ to\ pppo $ channel is also presented
A detailed study is presented of the expected performance of the ATLAS detector. The reconstructi... more A detailed study is presented of the expected performance of the ATLAS detector. The reconstruction of tracks, leptons, photons, missing energy and jets is investigated, together with the performance of b-tagging and the trigger. The physics potential for a variety of interesting physics processes, within the Standard Model and beyond, is examined. The study comprises a series of notes based on simulations of the detector and physics processes, with particular emphasis given to the data expected from the first years of operation of the LHC at CERN.
The results of a search for charged Higgs bosons are presented. The analysis is based on 4.6fb−1 ... more The results of a search for charged Higgs bosons are presented. The analysis is based on 4.6fb−1 of proton-proton collision data at $ \sqrt {s} = 7\;TeV $ collected by the ATLAS experiment at the Large Hadron Collider, using top quark pair events with a τ lepton in the final state. The data are consistent with the expected background from Standard Model processes. Assuming that the branching ratio of the charged Higgs boson to a τ lepton and a neutrino is 100 %, this leads to upper limits on the branching ratio of top quark decays to abquarkandachargedHiggsbosonbetween5%and1%forchargedHiggsbosonmasses ranging from 90 GeV to 160 GeV, respectively. In the context of the $ m_h^{\max } $ scenario of the MSSM, tan β above 12-26, as well as between 1 and 2-6, can be excluded for charged Higgs boson masses between 90 GeV and 150 GeV.
Nearly 50 years ago, theoretical physicists proposed that a field permeates the universe and give... more Nearly 50 years ago, theoretical physicists proposed that a field permeates the universe and gives energy to the vacuum. This field was required to explain why some, but not all, fundamental particles have mass. Numerous precision measurements during recent decades have provided indirect support for the existence of this field, but one crucial prediction of this theory has remained unconfirmed despite 30 years of experimental searches: the existence of a massive particle, the standard model Higgs boson. The ATLAS experiment at the Large Hadron Collider at CERN has now observed the production of a new particle with a mass of 126 giga–electron volts and decay signatures consistent with those expected for the Higgs particle. This result is strong support for the standard model of particle physics, including the presence of this vacuum field. The existence and properties of the newly discovered particle may also have consequences beyond the standard model itself.
Recent results obtained by the KLOE experiment operating at DA $\ Phi $ NE, the Frascati $\ phi $... more Recent results obtained by the KLOE experiment operating at DA $\ Phi $ NE, the Frascati $\ phi $-factory, are presented. They mainly concern neutral kaon decays including the $ K_L $ dominant branching ratios, the $ K_L $ lifetime and the extraction of the $ CKM $ parameter $ V_ {us} $ from the $ K_L $ semileptonic decays and lifetime. The best world upper limit on $ K_S\ to\ pppo $ channel is also presented
A detailed study is presented of the expected performance of the ATLAS detector. The reconstructi... more A detailed study is presented of the expected performance of the ATLAS detector. The reconstruction of tracks, leptons, photons, missing energy and jets is investigated, together with the performance of b-tagging and the trigger. The physics potential for a variety of interesting physics processes, within the Standard Model and beyond, is examined. The study comprises a series of notes based on simulations of the detector and physics processes, with particular emphasis given to the data expected from the first years of operation of the LHC at CERN.
The results of a search for charged Higgs bosons are presented. The analysis is based on 4.6fb−1 ... more The results of a search for charged Higgs bosons are presented. The analysis is based on 4.6fb−1 of proton-proton collision data at $ \sqrt {s} = 7\;TeV $ collected by the ATLAS experiment at the Large Hadron Collider, using top quark pair events with a τ lepton in the final state. The data are consistent with the expected background from Standard Model processes. Assuming that the branching ratio of the charged Higgs boson to a τ lepton and a neutrino is 100 %, this leads to upper limits on the branching ratio of top quark decays to abquarkandachargedHiggsbosonbetween5%and1%forchargedHiggsbosonmasses ranging from 90 GeV to 160 GeV, respectively. In the context of the $ m_h^{\max } $ scenario of the MSSM, tan β above 12-26, as well as between 1 and 2-6, can be excluded for charged Higgs boson masses between 90 GeV and 150 GeV.
Nearly 50 years ago, theoretical physicists proposed that a field permeates the universe and give... more Nearly 50 years ago, theoretical physicists proposed that a field permeates the universe and gives energy to the vacuum. This field was required to explain why some, but not all, fundamental particles have mass. Numerous precision measurements during recent decades have provided indirect support for the existence of this field, but one crucial prediction of this theory has remained unconfirmed despite 30 years of experimental searches: the existence of a massive particle, the standard model Higgs boson. The ATLAS experiment at the Large Hadron Collider at CERN has now observed the production of a new particle with a mass of 126 giga–electron volts and decay signatures consistent with those expected for the Higgs particle. This result is strong support for the standard model of particle physics, including the presence of this vacuum field. The existence and properties of the newly discovered particle may also have consequences beyond the standard model itself.
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