118786272
Non SUSY Searches at Tevatron
We present results on physics beyond Standard Model except SUSY with data mostly corresponding to an integrated luminosity of 200 ∼ 300 pb−1 in pp collisions at s = 1.96 TeV at the CDF and D0, Fermilab Tevatron collider experiments. New results on the searches for new phenomena include extra Z′ and W′ bosons, extra dimensions, leptoquarks, excited electrons as well as monopoles. We found no evidence and set the stringent limits on the signature and models.
117090485
Parity Violation in Elastic Scattering of Polarized Electrons from CARBON-12 at Q = 150 Mev/c
119112331
W' in new physics models at the LHC
We study the new heavy charged gauge boson W' in various models including Left-Right symmetric, Little Higgs, Randall-Sundrum and universal extra dimension model considering pp \rightarrow W' \rightarrow lepton + neutrino with the 7 TeV and 14 TeV CM energies at the LHC. Of particular, we show that the universal extra dimension model is highly constrained by existing and forthcoming data.
116971722
Polarized electrons at the Bates Linear Accelerator Center
A beam of polarized electrons have successfully been injected into the MIT Bates Linear Accelerator and accelerated it to 250 MeV. The intense beam was produced by photoemission from a GaAs crystal. The electron polarization at full energy, as measured by a brief test based on Moller scattering from a magnetized foil, was in excess of 30%. The peak intensity for the 15 ..mu..sec long pulses during the first test was about 2mA, representing about a third of the design value. The pulse rate of the accelerator was reduced to 60 Hz to minimize the total beam on the iron target. In a subsequent test, in which the beam hit a thick carbon target, the facility operated successfully at the full rate of 600 Hz. Under this condition, the average current on target was about 10 ..mu..A.
8529859
Measurement of parity violation in the elastic scattering of polarized electrons from 12C.
We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from $^{12}\mathrm{C}$ nuclei. Our result is ${\mathit{A}}_{\mathrm{expt}}$=0.60\ifmmode\pm\else\textpm\fi{}0.14\ifmmode\pm\else\textpm\fi{}0.02 ppm, where the first error is statistical and the second is systematic. With a beam polarization of 0.37, we compute the isoscalar vector hadronic coupling constant \ensuremath{\gamma}\ifmmode \tilde{}\else \~{}\fi{} to be 0.136\ifmmode\pm\else\textpm\fi{}0.032\ifmmode\pm\else\textpm\fi{}0.009. The standard model predicts \ensuremath{\gamma}\ifmmode \tilde{}\else \~{}\fi{}=0.155 at the tree level, in agreement with our data.
116401557
Test beam results from prototype scintillating tile calorimeters with fiber readout
117312767
Light Higgs Scenario in BMSSM and LEP Precision Data
In this Letter we consider very light Higgs fields in BMSSM(Beyond MSSM). The spectrum below TeV scale is the same as the MSSM but the Higgs potential is modified and is well described in terms of effective dimension five and six operators. A correction from the BMSSM operators allows us to consider new parameter space of Higgs sector which is not allowed in the MSSM. It can be regarded as a constrained version of general 2 Higgs doublet model (2HDM) as long as Higgs sector is concerned. We focus on the possibility that CP odd Higgs (A) mass is about 7 or 8 GeV and charged Higgs mass is comparable to W mass. At the same time one of the CP even Higgs (h) is light enough such that h and A production at the Z pole is kinematically allowed. The tension between forward backward asymmetry of bottom quark Ab_FB measured at LEP and the Standard Model prediction can be ameliorated if bottom quark pair produced from light CP even Higgs is taken into account.
59435944
UsingMT2to distinguish dark matter stabilization symmetries
We examine the potential of using colliders to distinguish models with parity (Z_2) stabilized dark matter (DM) from models in which the DM is stabilized by other symmetries, taking the latter to be a Z_3 symmetry for illustration. The key observation is that a heavier mother particle charged under a Z_3 stabilization symmetry can decay into one or two DM particles along with Standard Model (SM) particles. This can be contrasted with the decay of a mother particle charged under a parity symmetry; typically, only one DM particle appears in the decay chain. In arXiv:1003.0899, some of us studied the distributions of visible invariant mass from the decay of a single such mother particle in order to highlight the resulting distinctive signatures of Z_3 symmetry versus parity symmetry stabilized dark matter candidates. We now describe a complementary study which focuses on decay chains of the two mother particles which are necessarily present in these events. We also include in our analyss the missing energy/momentum in the event. For the Z_3 symmetry stabilized mothers, the resulting inclusive final state can have two, three or four DM particles. In contrast, models with Z_2 symmetry can have only two. We show that the shapes and edges of the distribution of M_T2-type variables, along with ratio of the visible momentum/energy on the two sides of the event, are powerful in distinguishing these different scenarios.
118421849
Tau physics from LEP
We briefly review recent analysis on the tau lepton by four LEP experiments, ALEPH, DELPHI, L3 and OPAL, based on data samples generated at the Z peak. Intrinsic properties of the tau lepton as well as applications to various physics topics are treated from an experimental point of view. The summarized analysis subjects include lifetime, leptonic branching ratios, hadronic decay structures, dipole moments, related electroweak and QCD properties, and the mass of the tau neutrino.
118542240
Holographic calculation of hadronic contributions to muon g-2
Using the gauge-gravity duality, we compute the leading order hadronic (HLO) contribution to the anomalous magnetic moment of muon, a{sub {mu}}{sup HLO}. Holographic renormalization is used to obtain a finite vacuum polarization. We find a{sub {mu}}{sup HLO}=470.5x10{sup -10} in anti-de Sitter/QCD with two light flavors, which is compared with the currently revised BABAR data estimated from e{sup +}e{sup -{yields}{pi}+{pi}-} events, a{sub {mu}}{sup HLO}[{pi}{pi}]=(514.1{+-}3.8)x10{sup -10}.
17667065
Review of Charm Semileptonic Decays and QCD
In this paper, we review recent progress in the field of semileptonic decays of charm mesons, including topics on the relative branching ratio and the form factors. The comparison between the experimental form factor measurements and the Lattice QCD calculations is emphasized.