Exact Solution of Photon Equation in Stationary G\"{o}del-type and G\"{o}del Space-Times

In this work the photon equation (massless Duffin-Kemmer-Petiau equation) is written expilicitly for general type of stationary G\"{o}del space-times and is solved exactly for G\"{o}del-type and G\"{o}del space-times. Harmonic oscillator behaviour of the solutions is discussed and energy spectrum of photon is obtained.Comment: 9 pages,RevTeX, no figure, revised for publicatio

Control of a Powered Prosthetic Hand Via a Tracked Glove 1

Although commercially available robotic prosthetic limbs now provide fingers with multiple degrees of freedom (DOFs), closely resembling the human hand, the amount of control channels provided by typical biological signals (electromyography or neural electrodes) Thus, by combining the two technologies, we developed a system to teleoperate the TouchBionics RoboLimb TM device with a custom-built 6DOF glove worn on the sound hand. The RoboLimb hand is a 6DOF prosthetic device which weighs under 500 g and can be controlled via a protocol based on the controller area network (CAN) The purpose of this system is to support on-going work in our laboratory to benefit unilateral amputees who have a sound hand with which they can teleoperate or otherwise interact with a robotic prosthetic device. Specifically, we are investigating the use of this system in (1) The performance of activities of daily living that will benefit from the mirroring of movements between the sound hand and the prosthetic device (e.g., folding a towel, moving a table, picking up a laundry basket, etc.). (2) Allow the user to pose the prosthetic hand in any desired configuration before performing a task. (3) Enable the recording of task specific grasping motions that can be defined and played back by the user in the field. Methods Tracking Glove. We have built a tracking glove using six SparkFun 2.2 00 flexion sensors (SparkFun, Inc.), a glove, an Arduino [4] Uno microcontroller, and Velcro TM to hold the Arduino device on the glove. The flexion sensors were attached to the glove through the use of custom-sewn sleeves which reduce the stress on the sensor attachment point by allowing the sensor to slide during movement. The flexion sensors were soldered to flexible multistrand wires, and the contact areas were encased in moldable thermoplastic (InstaMorph TM ) in order to prevent the soldered connections from failing during use. The resulting glove prototype is shown in The thermoplastic encased ends of the sensors were also molded into sewable buttons by a process involving laser-cut acrylic molds described in Healthy Limb Adaptor. In order to allow nonimpaired volunteers to wear and test the mirrored teleoperation of the system, a healthy limb adapter was created incorporating an Otto Bock QuickConnect ring molded onto the end of a 5 in. diameter polyvinyl chloride pipe using thermoplastic (InstaMorph T

Where the Sidewalk Ends: Jets and Missing Energy Search Strategies for the 7 TeV LHC

This work explores the potential reach of the 7 TeV LHC to new colored states in the context of simplified models and addresses the issue of which search regions are necessary to cover an extensive set of event topologies and kinematic regimes. This article demonstrates that if searches are designed to focus on specific regions of phase space, then new physics may be missed if it lies in unexpected corners. Simple multiregion search strategies can be designed to cover all of kinematic possibilities. A set of benchmark models are created that cover the qualitatively different signatures and a benchmark multiregion search strategy is presented that covers these models.Comment: 30 pages, 8 Figures, 3 Tables. Version accepted at JHEP. Minor changes. Added figur

Constraints on the χ_(c1) versus χ_(c2) polarizations in proton-proton collisions at √s = 8 TeV

The polarizations of promptly produced χ_(c1) and χ_(c2) mesons are studied using data collected by the CMS experiment at the LHC, in proton-proton collisions at √s=8  TeV. The χ_c states are reconstructed via their radiative decays χ_c → J/ψγ, with the photons being measured through conversions to e⁺e⁻, which allows the two states to be well resolved. The polarizations are measured in the helicity frame, through the analysis of the χ_(c2) to χ_(c1) yield ratio as a function of the polar or azimuthal angle of the positive muon emitted in the J/ψ → μ⁺μ⁻ decay, in three bins of J/ψ transverse momentum. While no differences are seen between the two states in terms of azimuthal decay angle distributions, they are observed to have significantly different polar anisotropies. The measurement favors a scenario where at least one of the two states is strongly polarized along the helicity quantization axis, in agreement with nonrelativistic quantum chromodynamics predictions. This is the first measurement of significantly polarized quarkonia produced at high transverse momentum

Measurement of the Forward-Backward Asymmetry in the B -> K(*) mu+ mu- Decay and First Observation of the Bs -> phi mu+ mu- Decay

We reconstruct the rare decays $B^+ \to K^+\mu^+\mu^-$, $B^0 \to K^{*}(892)^0\mu^+\mu^-$, and $B^0_s \to \phi(1020)\mu^+\mu^-$ in a data sample corresponding to $4.4 {\rm fb^{-1}}$ collected in $p\bar{p}$ collisions at $\sqrt{s}=1.96 {\rm TeV}$ by the CDF II detector at the Fermilab Tevatron Collider. Using $121 \pm 16$ $B^+ \to K^+\mu^+\mu^-$ and $101 \pm 12$ $B^0 \to K^{*0}\mu^+\mu^-$ decays we report the branching ratios. In addition, we report the measurement of the differential branching ratio and the muon forward-backward asymmetry in the $B^+$ and $B^0$ decay modes, and the $K^{*0}$ longitudinal polarization in the $B^0$ decay mode with respect to the squared dimuon mass. These are consistent with the theoretical prediction from the standard model, and most recent determinations from other experiments and of comparable accuracy. We also report the first observation of the $B^0_s \to \phi\mu^+\mu^- decay and measure its branching ratio${\mathcal{B}}(B^0_s \to \phi\mu^+\mu^-) = [1.44 \pm 0.33 \pm 0.46] \times 10^{-6}$using$27 \pm 6$signal events. This is currently the most rare$B^0_s$ decay observed.Comment: 7 pages, 2 figures, 3 tables. Submitted to Phys. Rev. Let