A Search For Di Lepton Signatures From Minimal Low Energy Supergravity In Bar P P Collisions At Radical 1 8
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A Search For Di Lepton Signatures From Minimal Low Energy Supergravity In Bar P P Collisions At Radical 1 8
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Author :
language : en
Publisher:
Release Date : 2001
A Search For Di Lepton Signatures From Minimal Low Energy Supergravity In Bar P P Collisions At Radical 1 8 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
We report on a search for supersymmetry using the DO detector. The 1994-96 data sample of[radical]s= 1:8 TeV[bar p]p collisions was analyzed for events containing two leptons (e or[mu]), two or more jets, and missing transverse energy. Assuming minimal supergravity, with free parameters m[sub 0], m[sub 1/2] and tan[beta], various thresholds were employed to optimize the search. No excess of events was observed. We present exclusion contours in the (m[sub 0], m[sub 1/2]) plane for tan[beta]= 2-6.
The Search For Di Lepton Signatures From Squarks And Gluinos In Pbar P Collisions At Square Root S
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Author :
language : en
Publisher:
Release Date : 2000
The Search For Di Lepton Signatures From Squarks And Gluinos In Pbar P Collisions At Square Root S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.
A search for Supergravity squark and gluino decays into di-leptons is presented. A novel search strategy of optimizing kinematic thresholds at each point in the three dimensional space of m[sub 0] -m[sub 1/2] -tan [beta] is employed. The model space is randomly scanned using a parameterized fast Monte Carlo. No events are observed above Standard Model background in 107.6 pb[sup -1] of Tevatron data collected by the D0 detector between 1993-96. Exclusion contours are presented in the m[sub 0] -m[sub 1/2] plane. At the 95% confidence level, a lower limit is set on the mass of gluinos of 129 GeV/c[sup 2] and on the mass of squarks of 138 GeV/c[sup 2] for all tan [beta]
The Search For Di Lepton Signatures From Squarks And Gluinos In Pp Collisions At Square Root Of S
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Author : Richard Joyner Genik
language : en
Publisher:
Release Date : 1998
The Search For Di Lepton Signatures From Squarks And Gluinos In Pp Collisions At Square Root Of S written by Richard Joyner Genik and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Particles (Nuclear physics) categories.
Search For Anomalous Kinematics Of Top Dilepton Events In Proton Anti Proton Collisions At S 1 2
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Author :
language : en
Publisher:
Release Date : 2005
Search For Anomalous Kinematics Of Top Dilepton Events In Proton Anti Proton Collisions At S 1 2 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
The authors present a search for anomalous kinematics of t[bar t] dilepton events in p[bar p] collisions at [radical]s = 1.96 TeV using 193 pb[sup -1] of data collected with the CDF II detector. They developed a new a priori technique designed to isolate the subset in a data sample revealing the largest deviation from Standard Model expectations and to quantify the significance of this departure. In the four-variable space considered, no particular subset shows a significant discrepancy and they find that the probability to obtain a data sample less consistent with the Standard Model than what is observed is 1.0-4.5%.
Search For The Trilepton Signal Of The Minimal Supergravity Model In D0 Run Ii
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Author : Meta Binder
language : en
Publisher:
Release Date : 2005
Search For The Trilepton Signal Of The Minimal Supergravity Model In D0 Run Ii written by Meta Binder and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
A search for associated chargino neutralino pair production is performed in the trilepton decay channel q{bar q} {yields} {tilde {chi}}{sub 1}{sup {+-}} {tilde {chi}}{sub 2}{sup 0} {yields} {ell}{sup {+-}} {nu} {tilde {chi}}{sub 1}{sup 0} {mu}{sup {+-}} {mu}{sup {-+}} {tilde {chi}}{sub 1}{sup 0}, using data collected with the D0 detector at a center-of-mass energy of 1.96 TeV at the Fermilab Tevatron Collider. The data sample corresponds to an integrated luminosity of {approx}300 pb{sup -1}. A dedicated event selection is applied to all samples including the data sample and the Monte Carlo simulated samples for the Standard Model background and the Supersymmetry signal. Events with two muons plus an additional isolated track, replacing the requirement of a third charged lepton in the event, are analyzed. Additionally, selected events must have a large amount of missing transverse energy due to the neutrino and the two {tilde {chi}}{sub 1}{sup 0}. After all selection cuts are applied, 2 data events are found, with an expected number of background events of 1.75 {+-} 0.34 (stat.) {+-} 0.46 (syst.). No evidence for Supersymmetry is found and limits on the production cross section times leptonic branching fraction are set. When the presented analysis is considered in combination with three other decay channels, no evidence for Supersymmetry is found. Limits on the production cross section times leptonic branching fraction are set. A lower chargino mass limit of 117 GeV at 95% CL is then derived for the mSUGRA model in a region of parameter space with enhanced leptonic branching fractions.
A Search For Excited Leptons In Pp Collisions At Sqrt S
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Author :
language : en
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Release Date : 2011
A Search For Excited Leptons In Pp Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
A search for excited leptons is carried out with the CMS detector at the LHC, using 36 inverse picobarns of pp collision data recorded at sqrt(s) = 7 TeV. The search is performed for associated production of a lepton and an oppositely charged excited lepton pp to l l*, followed by the decay l* to l gamma, resulting in the l l gamma final state, where l = electron or muon. No excess of events above the standard model expectation is observed. Interpreting the findings in the context of l* production through four-fermion contact interactions and subsequent decay via electroweak processes, first upper limits are reported for l* production at this collision energy. The exclusion region in the compositeness scale Lambda and excited lepton mass M(l*) parameter space is extended beyond previously established limits. For Lambda = M(l*), excited lepton masses are excluded below 1070 GeV/c2̂ for e* and 1090 GeV/c2̂ for mu* at the 95% confidence level.
Inclusive Search For New Physics With Like Sign Dilepton Events In P Bar P Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2007
Inclusive Search For New Physics With Like Sign Dilepton Events In P Bar P Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
Search For New Physics In Lepton Photon X Events With 305 Pb 1 Of P Anti P Collisions At S
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Author :
language : en
Publisher:
Release Date : 2006
Search For New Physics In Lepton Photon X Events With 305 Pb 1 Of P Anti P Collisions At S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
The authors present results of a search for anomalous production of events containing a charged lepton (l, either e or?) and a photon , both with high transverse momentum, accompanied by additional signatures, X, including missing transverse energy (E{sub T}) and additional leptons and photons. We use the same kinematic selection criteria as in a previous CDF search, but with a substantially larger data set, 305 pb−1, a p{bar p} collision energy of 1.96 TeV, and the upgraded CDF II detector. We find 42 l?E{sub T} events versus a standard model expectation of 37.3 ± 5.4 events. The level of excess observed in Run I, 16 events with an expectation of 7.6 ± 0.7 events (corresponding to a 2.7? effect), is not supported by the new data. In the signature of ll? + X we observe 31 events versus an expectation of 23.0 ± 2.7 events. In this sample we find no events with an extra photon or E{sub T} and so find no events like the one ee??E{sub T} event observed in Run I.
Search For Anomalous Kinematics Of Top Dilepton Events In Proton Antiproton Collisions At Square Root S
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Author : Andrew Gennadievich Ivanov
language : en
Publisher:
Release Date : 2004
Search For Anomalous Kinematics Of Top Dilepton Events In Proton Antiproton Collisions At Square Root S written by Andrew Gennadievich Ivanov and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
A Search For T Anti T Yields Lepton E Sub T Jets Signature In P Anti P Collisions At Radical
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Author :
language : en
Publisher:
Release Date : 2005
A Search For T Anti T Yields Lepton E Sub T Jets Signature In P Anti P Collisions At Radical written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
The authors report the results from a search for t[anti t] production in p[anti p] collisions at [radical]s = 1.8 TeV with the D0 detector at Fermilab in the final states consisting of one isolated high p[sub T] lepton (e or [mu]), multiple jets and a substantial missing transverse energy (E[sub T]), excluding the events that have [mu]-tagged jets. Two independent analysis approaches lead them to similar estimates for the cross-section. They see no conclusive evidence for top production in the 13.5 pb[sup [minus]1] of data taken during the 1992--1993 run of the Tevatron.