Search for the rare decays B-s(0) -> e(+) e(-) and B-0 -> e(+) e(-)

A search for the decays B 0 s → e + e − and B 0 → e + e − is performed using data collected with the LHCb experiment in proton-proton collisions at center-of-mass energies of 7, 8, and 13 TeV, corresponding to integrated luminosities of 1, 2, and 2     fb − 1 , respectively. No signal is observed. Assuming no contribution from B 0 → e + e − decays, an upper limit on the branching fraction B ( B 0 s → e + e − ) < 9.4 ( 11.2 ) × 10 − 9 is obtained at 90(95)% confidence level. If no B 0 s → e + e − contribution is assumed, a limit of B ( B 0 → e + e − ) < 2.5 ( 3.0 ) × 10 − 9 is determined at 90(95)% confidence level. These upper limits are more than one order of magnitude lower than the previous values

Eurographics Symposium on Virtual Environments (2004)

In this paper, a new pattern based optical tracking method is presented for the recognition and pose estimation of input devices for virtual or augmented reality environments. The method is based on pencils of line fiducials, which reduces occlusion problems and allows for single camera pattern recognition and orientation estimation. Pattern recognition is accomplished using a projective invariant property of line pencils: the cross ratio. Orientation is derived from single camera line-plane correspondences, and position estimation is achieved using multiple cameras. The method is evaluated against a related point based tracking approach. Results show our method has lower latency and comparable accuracy, and is less sensitive to occlusion