Inclusive double-helicity asymmetries in neutral-pion and eta-meson production in p→+p→ collisions at √s =200 GeV

Adare, A. and Aidala, C. and Ajitanand, N. N. and Akiba, Y. and Akimoto, R. and Al-Ta'ani, H. and Alexander, J. and Andrews, K. R. and Angerami, A. and Aoki, K. and Apadula, N. and Appelt, E. and Aramaki, Y. and Armendariz, R. and Aschenauer, E. C. and Awes, T. C. and Azmoun, B. and Babintsev, V. and Bai, M. and Bannier, B. and Barish, K. N. and Bassalleck, B. and Basye, A. T. and Bathe, S. and Baublis, V. and Baumann, C. and Bazilevsky, A. and Belmont, R. and Ben-Benjamin, J. and Bennett, R. and Csanád, Máté and Csörgő, Tamás and Dávid, Gábor and Kiss, Ádám and Nagy, Márton and Sziklai, János István and Vértesi, Róbert (2014) Inclusive double-helicity asymmetries in neutral-pion and eta-meson production in p→+p→ collisions at √s =200 GeV. PHYSICAL REVIEW D, 90 (1). ISSN 2470-0010

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Abstract

The CMS silicon tracker consists of two tracking devices utilizing semiconductor technology: the inner pixel and the outer strip detectors. They operate in a high-occupancy and high-radiation environment presented by particle collisions in the LHC. The tracker detectors occupy the region around the center of CMS, where the LHC beams collide, between 4 cm and 110 cm in radius and up to 280 cm along the beam axis. The pixel detector consists of 66 million pixels, covering about 1 m 2 total area. It is surrounded by the strip tracker with 10 million read-out channels covering about 200 m 2 total area. The proceedings describe the operational experience collected during the first three years of LHC running. Results include operational challenges encountered during data taking that influence the active fraction and read-out efficiency of the detectors. Details are given about the performance of the tracker at high occupancy with respect to local observables such as signal to noise ratio and hit reconstruction efficiency. Studies of radiation effects are presented with respect to the evolution of sensor bias, read-out thresholds in the inner pixels, and leakage current.

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