Search For Events With Leptonic Jets And Missing Transverse Energy In Mathbf P Bar P Collisions At Mathbf Sqrt S
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Search For Events With Leptonic Jets And Missing Transverse Energy In Mathbf P Bar P Collisions At Mathbf Sqrt S
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Author :
language : en
Publisher:
Release Date : 2010
Search For Events With Leptonic Jets And Missing Transverse Energy In Mathbf P Bar P Collisions At Mathbf 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 2010 with categories.
We present the first search for pair production of isolated jets of charged leptons in association with a large imbalance in transverse energy in p{bar p} collisions using 5.8 fb−1 of integrated luminosity collected by the D0 detector at the Fermilab Tevatron Collider. No excess is observed above Standard Model background, and the result is used to set upper limits on the production cross section of pairs of supersymmetric chargino and neutralino particles as a function of 'dark-photon' mass, where the dark photon is produced in the decay of the lightest supersymmetric particle.
Search For New Physics In Lepton Photon X Events With 929 Pb 1 Of P Anti P Collisions At S
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Author :
language : en
Publisher:
Release Date : 2007
Search For New Physics In Lepton Photon X Events With 929 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 2007 with categories.
The authors present results of a search at CDF in 929 ± 56 pb−1 of p{bar p} collisions at 1.96 TeV for the anomalous production of events containing a high-transverse momentum charged lepton (l, either e or?) and photon , accompanied by missing transverse energy (E{sub T}), and/or additional leptons and photons, and jets (X). They use the same selection criteria as in a previous CDF Run I search, but with an order-magnitude larger data set, a higher p{bar p} collisions energy, and the CDF II detector. They find 163 l?E{sub T} + X events, compared to an expectation of 150.6 ± 13.0 events. They observe 74 ll? + X events, compared to an expectation of 65.1 ± 7.7 events. They find no events similar to the Run II ee??E{sub T} event.
Search For Diphoton Events With Large Missing Transverse Energy In 6 3 Fb 1 Of Mathbf P Bar P Collisions At Mathbf Sqrt S
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Author :
language : en
Publisher:
Release Date : 2010
Search For Diphoton Events With Large Missing Transverse Energy In 6 3 Fb 1 Of Mathbf P Bar P Collisions At Mathbf 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 2010 with categories.
We report a search for diphoton events with large missing transverse energy produced in p{bar p} collisions at √s = 1.96 TeV. The data were collected with the D0 detector at the Fermilab Tevatron Collider, and correspond to 6.3 fb−1 of integrated luminosity. The observed missing transverse energy distribution is well described by the standard model prediction, and 95% C.L. limits are derived on two realizations of theories beyond the standard model. In a gauge mediated supersymmetry breaking scenario, the breaking scale [Lambda] is excluded for [Lambda]
Study Of P Bar P Collisions That Contain Leptons A Photon And A B Quark Using The Cdf Ii Detector
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Author :
language : en
Publisher:
Release Date : 2011
Study Of P Bar P Collisions That Contain Leptons A Photon And A B Quark Using The Cdf Ii Detector 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.
We present a search for anomalous production of the signature lepton + photon + b-quark + missing transverse energy (`[gamma]6ETb) produced in $p\bar{p}$ collisions at √ s = 1.96 TeV using 6.0 fb-1 of data taken with the CDF detector in Run II at the Tevatron. In addition to this signature-based search, we present a closely-related search for top pair production with an additional radiated photon, t$\bar{t}$[gamma]. We find 85 `[gamma]6ETb events versus an expectation of 99.1±9.3 events. High-statistics control samples are used to evaluate a low-energy photon [chi] 2 cut. Additionally requiring the events to contain at least three jets, have a total transverse energy of 200 GeV, and that the photon candidate passes the [chi] 2 cut, we observe 30 t$\bar{t}$[gamma] candidate events versus an expectation from non-top Standard Model (SM) sources of 13.0 ± 2.1 Assuming the difference between the observed number and the predicted non-top SM total is due to top production, we measure the tt$\bar{[gamma]}$ cross section to be 0.18 ± 0.08 pb. We also measure the ratio of the t$\bar{t}$[gamma] cross section to the t$\bar{t}$cross section to be 0.024 ± 0.009, which compares well with a SM prediction of 0.024 ± 0.013.
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 New Physics In Lepton Photon X Events With 929 Pb 1 Of P Anti P Collisions At S 1 2
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Author : A. Loginov
language : en
Publisher:
Release Date : 2006
Search For New Physics In Lepton Photon X Events With 929 Pb 1 Of P Anti P Collisions At S 1 2 written by A. Loginov 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 in 929 {+-} 56 pb{sup -1} of p{bar p} collisions at 1.96 TeV for the anomalous production of events containing a charged lepton ({ell}, either e or {mu}) and a photon ({gamma}), both with high transverse momentum, accompanied by additional signatures, X, including missing transverse energy (E{sub T}) and additional leptons and photons. They use the same selection criteria as in the previous CDF Run I search, but with an order-magnitude larger data set, a higher p{bar p} collision energy, and the CDF II detector.
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.
Search For New Physics In Lepton Photon X Events With 305 Pb 1 Of P Anti P Collisions At S 1 2
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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 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 2006 with categories.
The authors present results of a search for anomalous production of events containing a charged lepton (l, either e or [mu]) and a photon ([gamma]), 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[gamma]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[sigma] effect), is not supported by the new data. In the signature of ll[gamma] + 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[gamma][gamma]E{sub T} event observed in Run I.
A Search For New Physics In Photon Lepton Events In Proton Antiproton Collisions At Radical S
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Author :
language : en
Publisher:
Release Date : 2003
A Search For New Physics In Photon Lepton Events In Proton Antiproton Collisions At Radical 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 2003 with categories.
We present the results of a search in p[bar p] collisions at[radical]s= 1.8 TeV for anomalous production of events containing a photon with large transverse energy and a lepton (e or[mu]) with large transverse energy, using 86 pb[sup -1] of data collected at the Collider Detector at Fermilab during the 1994-95 collider run at the Fermilab Tevatron. The presence of large missing transverse energy (E[sub T]), additional photons, or additional leptons in these events is also analyzed. The results are consistent with standard model expectations, with the possible exception of photon-lepton events with large E[sub T], for which the probability of a statistical fluctuation of the standard model expectation up to and above the observed level is 0.7%.
Measurement Of The Top Pair Production Cross Section In The Dilepton Decay Channel In Ppbar Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2010
Measurement Of The Top Pair Production Cross Section In The Dilepton Decay Channel In Ppbar 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 2010 with categories.
A measurement of the t{bar t} production cross section in p{bar p} collisions at √s = 1.96 TeV using events with two leptons, missing transverse energy, and jets is reported. The data were collected with the CDF II Detector. The result in a data sample corresponding to an integrated luminosity 2.8 fb−1 is: [sigma]{sub t{bar t}} = 6.27 ± 0.739(stat) ± 0.63(syst) ± 0.39(lum) pb for an assumed top mass of 175 GeV/c2.