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Measurement of χc1and χc2production with √s = 7 TeV pp collisions at ATLAS

Journal of High Energy Physics 2014:7 (2014)

Authors:

G Aad, T Abajyan, B Abbott, J Abdallah, S Abdel Khalek, O Abdinov, R Aben, B Abi, M Abolins, OS Abouzeid, H Abramowicz, H Abreu, Y Abulaiti, BS Acharya, L Adamczyk, DL Adams, TN Addy, J Adelman, S Adomeit, T Adye, S Aefsky, T Agatonovic-Jovin, JA Aguilar-Saavedra, M Agustoni, SP Ahlen, A Ahmad, F Ahmadov, G Aielli, TPA Åkesson, G Akimoto, AV Akimov, MA Alam, J Albert, S Albrand, MJ Alconada Verzini, M Aleksa, IN Aleksandrov, F Alessandria, C Alexa, G Alexander, G Alexandre, T Alexopoulos, M Alhroob, M Aliev, G Alimonti, L Alio, J Alison, BMM Allbrooke, LJ Allison, PP Allport, SE Allwood-Spiers, J Almond, A Aloisio, R Alon, A Alonso, F Alonso, A Altheimer, B Alvarez Gonzalez, MG Alviggi, K Amako, Y Amaral Coutinho, C Amelung, VV Ammosov, SP Amor Dos Santos, A Amorim, S Amoroso, N Amram, G Amundsen, C Anastopoulos, LS Ancu, N Andari, T Andeen, CF Anders, G Anders, KJ Anderson, A Andreazza, V Andrei, XS Anduaga, S Angelidakis, P Anger, A Angerami, F Anghinolfi, AV Anisenkov, N Anjos, A Annovi, A Antonaki, M Antonelli, A Antonov, J Antos, F Anulli, M Aoki, L Aperio Bella, R Apolle, G Arabidze, I Aracena, Y Arai, ATH Arce, S Arfaoui, JF Arguin, S Argyropoulos

Abstract:

The prompt and non-prompt production cross-sections for the χc1and χc2charmonium states are measured in pp collisions at √s = 7TeV with the ATLAS detector at the LHC using 4.5 fb−1of integrated luminosity. The χcstates are reconstructed through the radiative decay χc→ J/ψγ (with J/ψ → μ+μ−) where photons are reconstructed from γ → e+e− conversions. The production rate of the χc2state relative to the χc1state is measured for prompt and non-prompt χcas a function of J/ψ transverse momentum. The prompt χccross-sections are combined with existing measurements of prompt J/ψ production to derive the fraction of prompt J/ψ produced in feed-down from χcdecays. The fractions of χc1and χc2produced in b-hadron decays are also measured.
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HARMONI instrument control electronics

Proceedings of SPIE--the International Society for Optical Engineering SPIE, the international society for optics and photonics 9147 (2014) 91478v-91478v-19

Authors:

José V Gigante, Luis F Rodríguez Ramos, Gerard Zins, Hermine Schnetler, Arlette Pecontal, José Miguel Herreros, Fraser Clarke, Ian Bryson, Niranjan Thatte
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Image slicing with a twist: spatial and spectral Nyquist sampling without anamorphic optics

Proceedings of SPIE--the International Society for Optical Engineering SPIE, the international society for optics and photonics 9151 (2014) 915118-915118-8
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Integral field spectroscopy of high redshift galaxies with the HARMONI spectrograph on the European Extremely Large Telescope

Proceedings of SPIE--the International Society for Optical Engineering SPIE, the international society for optics and photonics 9147 (2014) 91478z-91478z-8

Authors:

S Kendrew, S Zieleniewski, N Thatte, J Devriendt, R Houghton, T Fusco, M Tecza, F Clarke, Kieran O'Brien
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Optical and mechanical design of the fore-optics of HARMONI

Proceedings of SPIE--the International Society for Optical Engineering SPIE, the international society for optics and photonics 9147 (2014) 91479j-91479j-13

Authors:

J Sánchez-Capuchino, E Hernández, A Bueno, JM Herreros, N Thatte, I Bryson, F Clarke, M Tecza
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