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We report a high precision measurement of the transverse single spin asymmetry AN at the center of mass energy √s=200 GeV in elastic proton–proton scattering by the STAR experiment at RHIC. The AN was measured in the four-momentum transfer squared t range 0.003⩽|t|⩽0.035 (GeV/c)2, the region of a significant interference between the electromagnetic and hadronic scattering amplitudes. The measured values of AN and its t-dependence are consistent with a vanishing hadronic spin-flip amplitude, thus providing strong constraints on the ratio of the single spin-flip to the non-flip amplitudes. Since the hadronic amplitude is dominated by the Pomeron amplitude at this √s, we conclude that this measurement addresses the question about the presence of a hadronic spin flip due to the Pomeron exchange in polarized proton–proton elastic scattering.
[book review:] David Penney (Ed) 2013 Spider research in the 21st century – trends and perspectives
(2013)
The latest arachnological publication from Siri Scientific Press is a substantial compendium of spiderrelated topics covering many aspects of these fascinating animals’ biology. As the title suggests, the overarching theme running throughout this work are the advances which have been made in recent years – particularly through the application of novel methods and/or technologies – as well as productive directions for future research. Following an extensive foreword by Norman Platnick, which summarises the book’s main conclusions rather well, the volume itself is divided into nine self-contained and fully referenced chapters. All have been written by acknowledged experts in their fields and all provide an excellent account of the modern literature.