The Standard Model and Why We Believe It

Hewett, JoAnne L.

doi:10.2172/9919

Cited by 9 publications

(19 citation statements)

References 30 publications

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“…The third generation lepton masses are all close to 600 GeV, Mτ 1 = 599 GeV, Mτ 2 = 617 GeV, Mν τ = 610 GeV. These processes have previously been considered in [15,30].…”

Section: Resonant Slepton Productionmentioning

confidence: 69%

“…However given the limits on this coupling this signal will only be visible above the background at the highest couplings currently allowed by low energy experiments. In [15,30] it was suggested that by using the sidebands to normalize the background that resonant slepton production could be probed to much smaller values of the couplings. Indeed the S/ √ B numbers in Fig.…”

Section: Requiring the Two Leading Jets In E T To Be Back To Back ||φmentioning

confidence: 99%

“…Our results suggest that after including these effects the signal will only be visible for large values of the coupling. It may be possible to use the sidebands which we have removed with our cuts to normalize this background, as in [15,30], to improve the extraction of the signal. However this may not be possible due to the increased width of the resonance, Fig.…”

Section: Requiring the Two Leading Jets In E T To Be Back To Back ||φmentioning

confidence: 99%

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Parton-shower simulations of R-parity violating supersymmetric models

Dreiner

Seymour

Richardson

2000

J. High Energy Phys.

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We study the colour connection structure of R-parity violating decays and production cross sections, and construct a Monte Carlo simulation of these processes including colour coherence effects. We then present some results from the implementation of these processes in the HERWIG Monte Carlo event generator. We include the matrix elements for the two-body sfermion and three-body gaugino and gluino decays as well as the two-to-two resonant hard production processes in hadron-hadron collisions.

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“…The third generation lepton masses are all close to 600 GeV, Mτ 1 = 599 GeV, Mτ 2 = 617 GeV, Mν τ = 610 GeV. These processes have previously been considered in [15,30].…”

Section: Resonant Slepton Productionmentioning

confidence: 69%

Section: Requiring the Two Leading Jets In E T To Be Back To Back ||φmentioning

confidence: 99%

Section: Requiring the Two Leading Jets In E T To Be Back To Back ||φmentioning

confidence: 99%

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Parton-shower simulations of R-parity violating supersymmetric models

Dreiner

Seymour

Richardson

2000

J. High Energy Phys.

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“…Additional contributions to CP violation via loop diagrams appear in some extensions of the SM [109,110,111,112,113,114,115,116] and can result in these asymmetries within experimental reach. In experimental measurements the muon is much easier to identify than any other lepton, therefore all experimental results on the semileptonic charge asymmetry are obtained with l = µ in Eq.…”

Section: Cp Asymmetry In Mixing Of Neutral B Mesonsmentioning

confidence: 99%

B-Physics Results From Tevatron

Borissov

2013

Int. J. Mod. Phys. A

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This review summarizes the most important results in B physics obtained at the Tevatron. They include the discovery of the new B hadrons, the measurement of their masses and lifetimes, the measurement of the oscillation frequency of B 0 s meson, the search for its rare decay B 0 s → µ + µ − , and the study of the CP asymmetry in decays and mixing of B mesons.The CDF and DØ experiments are the general purpose collider detectors constructed to maximally exploit the possibilities provided by the pp collisions at √ s = 1.96 TeV and to operate at the instantaneous luminosity up to 5 × 10 32 cm −2 s −1 . Although the main emphasis in their design is made on the detection of events with the highest possible invariant mass, they also contain the specific elements necessary to endeavour the B-physics research.The tracking system of the CDF detector[1] includes the solenoidal magnet producing a uniform magnetic field of 1.4 T, the inner tracking volume containing the silicon microstrip detectors up to a radius of 28 cm from the beamline[2], and the outer tracking volume instrumented with an open-cell drift chamber [3] (COT) up to the radius of 137 cm. The first single-sided layer of the silicon detector[4] is mounted directly on the beam-pipe at the radius of 1.5 cm. The tracking systems reconstructs the trajectory and momentum of the charged particles up to the pseudorapidity 2 |η| < 2. The resolution of the track impact parameter 3 is about 40 µm. This resolution includes an uncertainty of the interaction point in the transverse plane, which is about 30 µm. The momentum resolution of the tracking system is σ(p T )/p 2 T ≃ 1.7 × 10 −3 GeV −1 , where p T is the component of the particle momentum transversal to the beam direction.The muon identification system[5, 6] is located after the magnet and the calorimeters, which serve as a shield to suppress the penetration of all charged and neutral particles except the muons. It includes the drift chambers, which detect muons with p T > 1.4 GeV within |η| < 0.6, and additional chambers and scintillators, which cover 0.6 < |η| < 1.0 for muons with p T > 2.0 GeV.An important component of the CDF detector essential for the B-physics measurements is the special trigger selecting events with displaced tracks. It is a three-level system. At the first level[7] the COT hits are grouped into tracks in the transverse plane. At the second level[8], the silicon hits are added to the tracks found at the first level. These hits improve the resolution of the track impact parameter, which is measured in real time. Finally, the displaced vertex trigger[9] requires two charged particles with p T > 2 GeV, and with impact parameters in the range 0.12 − 1 mm. This trigger configuration is the basis for many CDF measurements with fully hadronic B decays. Its other trigger configurations select the events with one or two muons. The central tracking system of the DØ detector[10] comprises a silicon microstrip tracker and a central fiber tracker, both located within a 1.9 T superconducting solenoidal mag...

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“…As such it is important to search for new sources of CP V beyond the SM. The B 0 s system is one possible source, since the effects of CP V are expected to be small in the SM [4], and can be significantly enhanced by new physics models [5,6,7,8,9].…”

Section: Introductionmentioning

confidence: 99%

Evidence for an anomalous like-sign dimuon charge asymmetry

Williams

2011

Nuclear Physics B - Proceedings Supplements

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The DØ Collaboration has recently measured the charge asymmetry of same-sign dimuon events in 6.1 fb −1 of data collected in p ¯ p collisions at the Fermilab Tevatron collider. This allows the extraction of the same-sign dimuon charge asymmetry in semileptonic b-hadron decays, which is predicted to be extremely small in the standard model. The result is found to differ by 3.2 standard deviations from the standard model value, providing the first evidence for anomalous CP-violation in the mixing of neutral B mesons. The analysis, and the method used to extract the result are described in detail.

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The Standard Model and Why We Believe It

Abstract: The principle components of the Standard Model and the status of their experimental verification are reviewed.

Cited by 9 publications

References 30 publications

Parton-shower simulations of R-parity violating supersymmetric models

Parton-shower simulations of R-parity violating supersymmetric models

B-Physics Results From Tevatron

Evidence for an anomalous like-sign dimuon charge asymmetry

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