3,525 research outputs found

    18th IEEE Real-Time Systems Symposium: Work in Progress Sessions

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    Dear Colleagues: Following, the success of last year's Work In Progress (WIP) Sessions during RTSS'96, I am pleased to continue that tradition by presenting you 10 excellent WIP reports for RTSS'97. The prime purpose of RTSS WIP sessions is to provide researchers in Academia and Industry an opportunity to discuss their evolving ideas and gather feedback thereon from the real-time community at large. There were 16 submissions for WIP presentations, of which 10 have been accepted for presentation during the symposium and for inclusion in RTSS'97 WIP proceedings. If you would like to reference any article included in the RTSS'97 WIP Proceedings, please note that theses proceedings are published as a Technical Report from Boston University, Computer Science Department (BUCS-TR-97- 021). Many people worked hard to make the idea of holding the WIP sessions a reality. In particular, I would like to thank Kwei-Jay Lin for accommodating the WIP sessions within the busy schedule of RTSS'97. Also, I would like to thank all members of the RTSS'97 Program Committee who helped me review these submissions. Finally, I would like to thank all those who submitted their work to RTSS'97 WIP Sessions. I hope these sessions will prove beneficial, both to the WIP presenters and to RTSS'97 attendees. Azer Bestavros RTSS'97 WIP Chair December 1997.IEEE-CS TC-RT

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

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    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
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