A Search For Scalar Bottom Quarks From Gluino Decays In Anti P P Collisions At S1 2
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| Total Pages | : 7 |
| Release | : 2005 |
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Download A Search for Scalar Bottom Quarks from Gluino Decays in Anti-p P Collisions at S**1/2 Book in PDF, Epub and Kindle
We searched for scalar bottom quarks in 156 pb−1 of {bar p}p collisions at √s = 1.96 TeV recorded by the CDF II experiment at the Tevatron. Scalar bottom quarks can be produced from gluino decays in R-parity conserving models of supersymmetry when the mass of the gluino exceeds that of the scalar bottom quark. Then, a scalar bottom quark can decay into a bottom quark and a neutralino. To search for this scenario, we investigated events with large missing transverse energy and at least three jets, two or more of which were identified as containing a secondary vertex from the hadronization of b quarks. We found four candidate events, where 2.6 ± 0.7 are expected from standard model processes, and placed 95% confidence level lower limits on gluino and scalar bottom quark masses of up to 280 and 240 GeV/c2 , respectively.
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| Total Pages | : 7 |
| Release | : 2005 |
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Download A Search for Scalar Bottom Quarks from Gluino Decays in Anti-p P Collisions at S**ư Book in PDF, Epub and Kindle
We searched for scalar bottom quarks in 156 pb−1 of {bar p}p collisions at √s = 1.96 TeV recorded by the CDF II experiment at the Tevatron. Scalar bottom quarks can be produced from gluino decays in R-parity conserving models of supersymmetry when the mass of the gluino exceeds that of the scalar bottom quark. Then, a scalar bottom quark can decay into a bottom quark and a neutralino. To search for this scenario, we investigated events with large missing transverse energy and at least three jets, two or more of which were identified as containing a secondary vertex from the hadronization of b quarks. We found four candidate events, where 2.6 ± 0.7 are expected from standard model processes, and placed 95% confidence level lower limits on gluino and scalar bottom quark masses of up to 280 and 240 GeV/c2, respectively.
| Author | : Carsten Rott |
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| Total Pages | : 185 |
| Release | : 2004 |
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Download Search for Scalar Bottom Quarks from Gluino Decays in Proton - Anti-proton Collisions at a Center-of-Mass Energy of 1.96-TeV. Book in PDF, Epub and Kindle
The authors have performed a search for the scalar bottom quark ({tilde b}{sub 1}) from gluino ({tilde g}) decays in an R-parity conserving SUSY scenario with m{sub {tilde g}}> m{sub {tilde b}{sub 1}}, by investigating a final state of large missing transverse energy, with three or more jets, and some of them from the hadronization of b-quarks. A data sample of 156 pb{sup -1} collected by the Collider Detector at Fermilab at a center-of-mass energy of {radical}s = 1.96 TeV was used. For the final selection, jets containing secondary displaced vertices were required. This analysis has been performed ''blind'', in that the inspection of the signal region was only made after the Standard Model prediction was finalized. Comparing data with SUSY predictions, they can exclude masses of the gluino and sbottom of up to 280 and 240 GeV/c{sup 2} respectively.
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| Total Pages | : 7 |
| Release | : 2006 |
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Download Search for Pair Production of Scalar Bottom Quarks in P Anti-p Collisions at S**ư Book in PDF, Epub and Kindle
A search for direct production of scalar bottom quarks ({bar b}) is performed with 310 pb−1 of data collected by the D0 experiment in p{bar p} collisions at √s = 1.96 TeV at the Fermilab Tevatron Collider. The topology analyzed consists of two b jets and an imbalance in transverse momentum due to undetected neutralinos ({tilde {chi}}1°), with {tilde {chi}}1° assumed to be the lightest supersymmetric particle. They find the data consistent with standard model expectations, and set a 95% C.L. exclusion domain in the (m{sub {tilde b}}, m{sub {tilde {chi}}}) mass plane, improving significantly upon the results from Run I of the Tevatron.
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| Total Pages | : 7 |
| Release | : 2006 |
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Download Search for Pair Production of Scalar Bottom Quarks in P Anti-p Collisions at S**1/2 Book in PDF, Epub and Kindle
A search for direct production of scalar bottom quarks ({bar b}) is performed with 310 pb−1 of data collected by the D0 experiment in p{bar p} collisions at √s = 1.96 TeV at the Fermilab Tevatron Collider. The topology analyzed consists of two b jets and an imbalance in transverse momentum due to undetected neutralinos ({tilde {chi}}1°), with {tilde {chi}}1° assumed to be the lightest supersymmetric particle. They find the data consistent with standard model expectations, and set a 95% C.L. exclusion domain in the (m{sub {tilde b}}, m{sub {tilde {chi}}}) mass plane, improving significantly upon the results from Run I of the Tevatron.
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| Total Pages | : 7 |
| Release | : 2009 |
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Download Search for Gluino-Mediated Sbottom Production in P Anti-p Collisions at S**1/2 Book in PDF, Epub and Kindle
We report on a search for the supersymmetric partner of the bottom quark produced from gluino decays in data from 2.5 fb−1 of integrated luminosity collected by the Collider Detector at Fermilab at √s = 1.96 TeV. Candidate events are selected requiring two or more jets and large missing transverse energy. At least two of the jets are required to be tagged as originating from a b quark to enhance the sensitivity. The results are in good agreement with the prediction of the standard model processes, giving no evidence for gluino decay to sbottom quarks. This result constrains the gluino-pair-production cross section to be less than 40 fb at 95% credibility level for a gluino mass of 350 GeV/c2.
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| Total Pages | : 7 |
| Release | : 2010 |
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Download Search for the Production of Scalar Bottom Quarks in $p \bar {p} $ Collisions at $\sqrt{s} $ Book in PDF, Epub and Kindle
We report on a search for direct scalar bottom quark (sbottom) pair production in p{bar p} collisions at (square root)s = 1.96 TeV, in events with large missing transverse energy and two jets of hadrons in the final state, where at least one of the jets is required to be identified as originating from a b quark. The study uses a CDF Run II data sample corresponding to 2.65 fb−1 of integrated luminosity. The data are in agreement with the standard model. In an R-parity conserving minimal supersymmetric scenario, and assuming that the sbottom decays exclusively into a bottom quark and a neutralino, 95% confidence-level upper limits on the sbottom pair production cross section of 0.1 pb are obtained. For neutralino masses below 70 GeV/c2, sbottom masses up to 230 GeV/c2 are excluded at 95% confidence level.
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| Total Pages | : 7 |
| Release | : 2009 |
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Download Search for Gluino-Mediated Sbottom Production in P Anti-p Collisions at S**ư Book in PDF, Epub and Kindle
We report on a search for the supersymmetric partner of the bottom quark produced from gluino decays in data from 2.5 fb−1 of integrated luminosity collected by the Collider Detector at Fermilab at √s = 1.96 TeV. Candidate events are selected requiring two or more jets and large missing transverse energy. At least two of the jets are required to be tagged as originating from a b quark to enhance the sensitivity. The results are in good agreement with the prediction of the standard model processes, giving no evidence for gluino decay to sbottom quarks. This result constrains the gluino-pair-production cross section to be less than 40 fb at 95% credibility level for a gluino mass of 350 GeV/c2.
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| Total Pages | : 3 |
| Release | : 2010 |
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Download Search for Scalar Bottom Quarks and Third-generation Leptoquarks in $p\overline{p}$ Collisions at $\sqrt{s}$ Book in PDF, Epub and Kindle
We present the results of a search for pair production of scalar bottom quarks ({bar b}1) and scalar third-generation leptoquarks (LQ3) in a data sample of 5.2 f b−1 collected by the D0 experiment at the Tevatron, the p{bar p} collider at Fermilab. We assume that sbottoms decay to a neutralino ({bar {chi}}1°) and a b quark, and we set 95% C.L. lower limits on their production in the (m{sub {bar b}1}, m{sub {bar {chi}}1°}) mass plane such that m{sub {bar b}1}> 247 GeV for m{sub {bar {chi}}1°} = 0 and m{sub {bar {chi}}1°}> 110 GeV for 160
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| Total Pages | : 7 |
| Release | : 2007 |
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Download Search for Stopped Gluinos from P-anti-p Collisions at S**1/2 Book in PDF, Epub and Kindle
Long-lived, heavy particles are predicted in a number of models beyond the standard model of particle physics. We present the first direct search for such particles' decays, occurring up to 100 h after their production and not synchronized with an accelerator bunch crossing. We apply the analysis to the gluino ({tilde g}), predicted in split supersymmetry, which after hadronization can become charged and lose enough momentum through ionization to come to rest in dense particle detectors. Approximately 410 pb−1 of p{bar p} collisions at sqrt(s)=1.96 TeV collected with the D0 detector during Run II of the Fermilab Tevatron collider are analyzed in search of such 'stopped gluinos' decaying into a gluon and a neutralino ({tilde {chi}}1°). Limits are placed on the (gluino cross section)x(probability to stop)x[BR({tilde g}→g {tilde {chi}}1{sup 0
