Measurements of J/ψ Production and Polarization in p+p and p+Au Collisions at s NN = 200 GeV with the STAR Experiment

Abstract

We present the measurements of J/ψ production at mid-rapidity via the di-muon decay channel in p+p and p+Au collisions at √ s NN = 200 GeV by the STAR experiment at RHIC. In p+p collisions, the measured inclusive J/ψ cross section can be qualitatively described by model calculations. The J/ψ polarization parameters, λ θ , λ φ as well as the frame-invariant quantity λ inv , are presented as a function of transverse momentum in both the helicity and Collins-Soper frames. No significant polarization is observed. In addition, the nuclear modification factor for inclusive J/ψ in p+Au collisions is similar to that measured in d+Au collisions and favors an additional nuclear absorption effect on top of the nuclear PDF effect.

Overtaking Assistance System based on Signal Strength to Prevent Accidents in V2V Communication Environment

“…Cooperative Collision Warning (CCW) which provides an active safety mechanism for vehicles on highways is implemented by exchanging static and dynamic vehicle parameters with neighboring vehicles through inter-vehicle wireless communications. 8 With the development of Internet and data transfer methods, different strategies have been implemented to provide solutions for these kinds of problems. With Internet of Things (IoT) based smart systems for accident prevention, the V2V communication technology has enabled the implementation and development of communication between nearby vehicles and tracking vehicles during their travel using modern technologies such as GPS.…”

“…The IEEE 802.11p/WAVE (Wireless Access in Vehicular Environments) standard is implemented to set Physical (PHY) and Medium Access Control (MAC) layer specifications to enable V2V (vehicle-to-vehicle) communications in Vehicular Ad-Hoc Networks (VANETs). 7,8 There are several studies on cooperative assistance systems by using V2V communication method. Specifically, broadcasting live streams of videos to nearby vehicles are proposed by many researchers.…”