Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 27
Book Description
The authors present the results of the first hadron collider search for heavy, long-lived neutralinos that decay via {tilde {chi}}1° → [gamma]{tilde G} in gauge-mediated supersymmetry breaking models. Using an integrated luminosity of 570 ± 34 pb−1 of p{bar p} collisions at √s = 1.96 TeV, they select [gamma]+jet+missing transverse energy candidate events based on the arrival time of a high-energy photon at the electromagnetic calorimeter as measured with a timing system that was recently installed on the CDF II detector. They find 2 events, consistent with the background estimate of 1.3 ± 0.7 events. While the search strategy does not rely on model-specific dynamics, they set cross section limits and place the world-best 95% C.L. lower limit on the {tilde {chi}}1° mass of 101 GeV/c2 at [tau]{sub {tilde {chi}}1°} = 5 ns.
Search for Heavy, Long-Lived Neutralinos that Decay to Photons at CDF II Using Photon Timing
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 27
Book Description
The authors present the results of the first hadron collider search for heavy, long-lived neutralinos that decay via {tilde {chi}}1° → [gamma]{tilde G} in gauge-mediated supersymmetry breaking models. Using an integrated luminosity of 570 ± 34 pb−1 of p{bar p} collisions at √s = 1.96 TeV, they select [gamma]+jet+missing transverse energy candidate events based on the arrival time of a high-energy photon at the electromagnetic calorimeter as measured with a timing system that was recently installed on the CDF II detector. They find 2 events, consistent with the background estimate of 1.3 ± 0.7 events. While the search strategy does not rely on model-specific dynamics, they set cross section limits and place the world-best 95% C.L. lower limit on the {tilde {chi}}1° mass of 101 GeV/c2 at [tau]{sub {tilde {chi}}1°} = 5 ns.
Publisher:
ISBN:
Category :
Languages : en
Pages : 27
Book Description
The authors present the results of the first hadron collider search for heavy, long-lived neutralinos that decay via {tilde {chi}}1° → [gamma]{tilde G} in gauge-mediated supersymmetry breaking models. Using an integrated luminosity of 570 ± 34 pb−1 of p{bar p} collisions at √s = 1.96 TeV, they select [gamma]+jet+missing transverse energy candidate events based on the arrival time of a high-energy photon at the electromagnetic calorimeter as measured with a timing system that was recently installed on the CDF II detector. They find 2 events, consistent with the background estimate of 1.3 ± 0.7 events. While the search strategy does not rely on model-specific dynamics, they set cross section limits and place the world-best 95% C.L. lower limit on the {tilde {chi}}1° mass of 101 GeV/c2 at [tau]{sub {tilde {chi}}1°} = 5 ns.
Search for Supersymmetry in pp Collisions at √s = 8 TeV with a Photon, Lepton, and Missing Transverse Energy
Author: Yutaro Iiyama
Publisher: Springer
ISBN: 3319586610
Category : Science
Languages : en
Pages : 182
Book Description
This Ph.D. thesis is a search for physics beyond the standard model (SM) of particle physics, which successfully describes the interactions and properties of all known elementary particles. However, no particle exists in the SM that can account for the dark matter, which makes up about one quarter of the energy-mass content of the universe. Understanding the nature of dark matter is one goal of the CERN Large Hadron Collider (LHC). The extension of the SM with supersymmetry (SUSY) is considered a promising possibilities to explain dark matter. The nominated thesis describes a search for SUSY using data collected by the CMS experiment at the LHC. It utilizes a final state consisting of a photon, a lepton, and a large momentum imbalance probing a class of SUSY models that has not yet been studied extensively. The thesis stands out not only due to its content that is explained with clarity but also because the author performed more or less all aspects of the thesis analysis by himself, from data skimming to limit calculations, which is extremely rare, especially nowadays in the large LHC collaborations.
Publisher: Springer
ISBN: 3319586610
Category : Science
Languages : en
Pages : 182
Book Description
This Ph.D. thesis is a search for physics beyond the standard model (SM) of particle physics, which successfully describes the interactions and properties of all known elementary particles. However, no particle exists in the SM that can account for the dark matter, which makes up about one quarter of the energy-mass content of the universe. Understanding the nature of dark matter is one goal of the CERN Large Hadron Collider (LHC). The extension of the SM with supersymmetry (SUSY) is considered a promising possibilities to explain dark matter. The nominated thesis describes a search for SUSY using data collected by the CMS experiment at the LHC. It utilizes a final state consisting of a photon, a lepton, and a large momentum imbalance probing a class of SUSY models that has not yet been studied extensively. The thesis stands out not only due to its content that is explained with clarity but also because the author performed more or less all aspects of the thesis analysis by himself, from data skimming to limit calculations, which is extremely rare, especially nowadays in the large LHC collaborations.
SUSY06
Author: Jonathan L. Feng
Publisher: American Institute of Physics
ISBN:
Category : Science
Languages : en
Pages : 750
Book Description
This book contains the proceedings of the 14th International Conference on Supersymmetry and the Unification of Fundamental Interactions, SUSY06, held in Irvine, California, in June 2006. This conference took place just before the start of the Large Hadron Collider, widely anticipated to yield profound new results, and provided a focus for the growing excitement in high energy physics through over 250 plenary and parallel talks.
Publisher: American Institute of Physics
ISBN:
Category : Science
Languages : en
Pages : 750
Book Description
This book contains the proceedings of the 14th International Conference on Supersymmetry and the Unification of Fundamental Interactions, SUSY06, held in Irvine, California, in June 2006. This conference took place just before the start of the Large Hadron Collider, widely anticipated to yield profound new results, and provided a focus for the growing excitement in high energy physics through over 250 plenary and parallel talks.
Supersymmetry and the Unification of Fundamental Interactions
Author: Deog Ki Hong
Publisher: AIP Conference Proceedings (Nu
ISBN:
Category : Science
Languages : en
Pages : 670
Book Description
This annual SUSY conference has become the world's largest international meeting devolted to new ideas in high energy physics. The main subject of the conference is theoretical and phenomenological aspects of supersymmetric theories, and dark matter and dark energy, and other comological connections. New, interesting results from various experimental groups are increasingly presented at the conference as well. With roughly 200 plenary and parallel presentations, SUSY08 will likely deliver energy and enthusiasm of both theorists and experimentalists who are searching the frontier of high energy physics.
Publisher: AIP Conference Proceedings (Nu
ISBN:
Category : Science
Languages : en
Pages : 670
Book Description
This annual SUSY conference has become the world's largest international meeting devolted to new ideas in high energy physics. The main subject of the conference is theoretical and phenomenological aspects of supersymmetric theories, and dark matter and dark energy, and other comological connections. New, interesting results from various experimental groups are increasingly presented at the conference as well. With roughly 200 plenary and parallel presentations, SUSY08 will likely deliver energy and enthusiasm of both theorists and experimentalists who are searching the frontier of high energy physics.
Acta Physica Polonica
Exotic Photon Searches at CDF II.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
We present recent results of searches for exotic photons at CDF II. In the first signature-based search, we search for anomalous production of two photons with additional energetic objects. The results are consistent with the standard model expectations. In the second analysis, we present a signature-based search for anomalous production of events containing a photon, two jets, of which at least one is identified as originating from a b quark, and missing transverse energy. We find no indications of non-standard model phenomena. Finally, a search for a fermiophobic Higgs in the diphoton final state is presented. Since no evidence of a resonance in the diphoton mass spectrum is observed we exclude this Higgs boson with mass below 106 GeV/c2 at a 95% confidence level.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
We present recent results of searches for exotic photons at CDF II. In the first signature-based search, we search for anomalous production of two photons with additional energetic objects. The results are consistent with the standard model expectations. In the second analysis, we present a signature-based search for anomalous production of events containing a photon, two jets, of which at least one is identified as originating from a b quark, and missing transverse energy. We find no indications of non-standard model phenomena. Finally, a search for a fermiophobic Higgs in the diphoton final state is presented. Since no evidence of a resonance in the diphoton mass spectrum is observed we exclude this Higgs boson with mass below 106 GeV/c2 at a 95% confidence level.
Summary of Searches for SUSY in Photonic States and Long Lived Particles (CDF+D0).
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 3
Book Description
New results are presented in testing Supersymmetry at the Tevatron using photonic final states and searching for long-lived neutral and charged particles.
Publisher:
ISBN:
Category :
Languages : en
Pages : 3
Book Description
New results are presented in testing Supersymmetry at the Tevatron using photonic final states and searching for long-lived neutral and charged particles.
New Physics Searches with Photons in CDF.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
A brief review of searches for physics beyond the Standard Model with photons using the CDF detector at the Tevatron is given here. These include searches for supersymmetry, extra dimensions, excited electrons and W/Z+[gamma] production, as well as anomalous photon production. Recent results from CDF Run II experiment are presented, but some results from Run I are also reviewed.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
A brief review of searches for physics beyond the Standard Model with photons using the CDF detector at the Tevatron is given here. These include searches for supersymmetry, extra dimensions, excited electrons and W/Z+[gamma] production, as well as anomalous photon production. Recent results from CDF Run II experiment are presented, but some results from Run I are also reviewed.
Spectral Distribution of the Two-photon Decay of He-like Krypton
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 165
Book Description
The 2 1S0 state in helium-like ions is forbidden to decay to the ground state by the emission of a single photon so the dominant decay mode is emission of two E1 photons. The energies of the individual photons have a continuous distribution with a broad peak at half the transition energy and the sum of the energies of the two photons is equal to the transition energy. The shape of the continuum single-photon spectrum provides a sensitive probe of the calculation of the transition probability for this decay and we have started a program to make a precision measurement of the spectral shape of the decay of the 2 1S0 level in He-like krypton in order to test the calculations.
Publisher:
ISBN:
Category :
Languages : en
Pages : 165
Book Description
The 2 1S0 state in helium-like ions is forbidden to decay to the ground state by the emission of a single photon so the dominant decay mode is emission of two E1 photons. The energies of the individual photons have a continuous distribution with a broad peak at half the transition energy and the sum of the energies of the two photons is equal to the transition energy. The shape of the continuum single-photon spectrum provides a sensitive probe of the calculation of the transition probability for this decay and we have started a program to make a precision measurement of the spectral shape of the decay of the 2 1S0 level in He-like krypton in order to test the calculations.
The Two-photon Decay of 1s2s 1S° States in Heavy He-like Atomic Systems
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 5
Book Description
In He-like systems the decay of the 1s2s 1S0 excited state to the 1s2 1S0 ground state is not allowed. This excited state can only decay to the ground state via the emission of two photons. The spectral shape of the emitted continuum is determined by the complete structure of the atomic system as all bound and continuum P states contribute to the 2E1 decay. For very heavy atomic systems the 3P states ALSO have to be included and the normalized spectral shape changes with atomic number according to the relative strengths of both, the electron-electron interaction and of the relativistic effects. A brief survey on the variation of the spectral shape of the two-photon continuum with atomic number is given and compared to experiments ranging from He-like Ni to He-like Au with special emphasis on the heavy relativistic system. The data compare well with fully relativistic calculations.
Publisher:
ISBN:
Category :
Languages : en
Pages : 5
Book Description
In He-like systems the decay of the 1s2s 1S0 excited state to the 1s2 1S0 ground state is not allowed. This excited state can only decay to the ground state via the emission of two photons. The spectral shape of the emitted continuum is determined by the complete structure of the atomic system as all bound and continuum P states contribute to the 2E1 decay. For very heavy atomic systems the 3P states ALSO have to be included and the normalized spectral shape changes with atomic number according to the relative strengths of both, the electron-electron interaction and of the relativistic effects. A brief survey on the variation of the spectral shape of the two-photon continuum with atomic number is given and compared to experiments ranging from He-like Ni to He-like Au with special emphasis on the heavy relativistic system. The data compare well with fully relativistic calculations.