Search for Heavy Bottomlike Quarks Decaying to an Electron or Muon and Jets in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mover accent="true"><mml:mi>p</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math>Collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>1.96</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>TeV</mml:mi></mml:math>

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doi:10.1103/physrevlett.106.141803

Cited by 59 publications

(17 citation statements)

References 32 publications

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“…CDF searched for an excess of events with an electron or a muon, at least five jets (one tagged as a b or c), and an imbalance of transverse momentum. The observed events were consistent with background expectations, giving the upper limit of m b 0 > 372 GeV at 95% CL [10].…”

Section: Introductionsupporting

confidence: 83%

Threshold effects in the decay of heavyb′andt′quarks

Chào

Chen

et al. 2011

Phys. Rev. D

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A sequential fourth generation is still viable, but the t 0 and b 0 quarks are constrained not to be too far apart in mass. The t 0 ! bW and b 0 ! tW decay channels are still being pursued at the Tevatron, which will soon be surpassed by the LHC. We use a convolution method with up to five-body final states to study t 0 and b 0 decays. We show how the two decay branches for m b 0 below the tW threshold, b 0 ! tW Ã and t Ã W, merge with b 0 ! tW above the threshold. We then consider the heavy-to-heavy transitions b 0 ! t 0ðÃÞ W ðÃÞ (or t 0 ! b 0ðÃÞ W ðÃÞ ), as they are not suppressed by quark mixing. We find that, because of the threshold sensitivity of the branching fraction of t 0 ! b 0 W Ã (or b 0 ! t 0 W Ã ), it is possible to measure the strength of the CKM mixing element V t 0 b (or V tb 0 ), especially when it is rather small. We urge experimenters to pursue and separate the t 0 ! b 0 W Ã (or b 0 ! t 0 W Ã ) decay in their search programs.

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Section: Introductionsupporting

confidence: 83%

Threshold effects in the decay of heavyb′andt′quarks

Chào

Chen

et al. 2011

Phys. Rev. D

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“…Up today no new particles were observed, results were consistent with Standard Model expectations or leads to the setting limits to the particles masses (e. g. graviton, stop, W', Z', b', t'), which can be find in [10,11,12,13,14,15].…”

Section: The Tevatronsupporting

confidence: 71%

Study of the top quark electric charge at the CDF experiment

Bartoš

2011

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AcknowledgementsFirst of all I would like to express my great thanks to my supervisor doc. RNDr.Stanislav Tokár, CSc. for his support. He advised me to became a part of the CDF collaboration at Fermilab, where I met a lot of excellent physicists. He always had time to answer my questions, helped me to understand the present high energy physics as well as discussed with me any analysis result or any problem -physical or technical -that I met during my study.My special thanks belongs to Veronica Sorin for her guiding me trough the analysis, she has taught me how to negotiate the problems by a further studies. Her enthusiasm for the work inspired me.I want to thanks also to other members of the top charge group -Veronique Boisvert, Yen-Chu Chen, Andy Beretvas, Jaroslav Antos, from whom I learned many things trough the discussions on our weekly meetings. Kl 'úč ové slová: náboj top kvarku, experiment CDF, váhovanie náboja trekov, b-jet. AbstractWe report on the measurement of the top quark electric charge using the jet charge of data, that the p-value under the standard model hypothesis is equal to 13.4%, while the p-value under the exotic model hypothesis is equal to 0.014%. Using the a priori criteria generally accepted by the CDF collaboration, we can say that the result is consistent with the standard model, while we exclude an exotic quark hypothesis with 95% confidence. Using the Bayesian approach, we obtain for the Bayes factor (2ln(BF )) a value of 19.6, that favors very strongly the SM hypothesis over the XM one. The presented method has the highest sensitivity to the top quark electric charge among the presented so far top quark charge analysis.

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“…Wt and the search for 4W final states from the pair-production of p " p ! d 4 " d 4 [10], with the assumption that m u4 > m d4 . Note that these limits are obtained with the assumptions of maximum mixing between the fourth-and the third-generation quarks and 100% branching ratio of the decay processes.…”

Section: Introductionmentioning

confidence: 99%

Probing the fourth generation Majorana neutrino dark matter

Zhou

2012

Phys. Rev. D

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Heavy fourth generation Majorana neutrino can be stable and contribute to a small fraction of the relic density of dark matter (DM) in the Universe. Due to its strong coupling to the standard model particles, it can be probed by the current direct detection experiments even it is a subdominant component of the whole halo DM. Assuming that it contributes to the same fraction of the local halo DM density as that of the DM relic density, we show that the current Xenon100 data constrain the mass of the stable Majorana neutrino to be greater than the mass of the top quark. In the mass range between 200 GeV and a few hundred GeV, the effective spin-independent cross section for the neutrino elastic scattering off nucleon is insensitive to the neutrino mass and is predicted to be $\sim 1.5\times 10^{-44} cm^2$, which can be reached by the direct DM search experiments soon. In the same mass region the predicted effective spin-dependent cross section for the heavy neutrino scattering off proton is in the range $2\times 10^{-40} cm^2\sim 2\times 10^{-39} cm^2$, which is within the reach of the ongoing IceCube experiment. We demonstrate such properties in a fourth generation model with the stability of the fourth Majorana neutrino protected by an additional generation-dependent U(1) gauge symmetry.Comment: 22 pages, 5 figures, discussions on collider searches included, to appear in Phys. Rev.

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Search for Heavy Bottomlike Quarks Decaying to an Electron or Muon and Jets inpp¯Collisions ats=1.96 TeV

Cited by 59 publications

References 32 publications

Threshold effects in the decay of heavyb′andt′quarks

Threshold effects in the decay of heavyb′andt′quarks

Study of the top quark electric charge at the CDF experiment

Probing the fourth generation Majorana neutrino dark matter

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