- Main
Measurement of χc1and χc2production with √s = 7 TeV pp collisions at ATLAS
- Aad, G;
- Abajyan, T;
- Abbott, B;
- Abdallah, J;
- Abdel Khalek, S;
- Abdinov, O;
- Aben, R;
- Abi, B;
- Abolins, M;
- Abouzeid, OS;
- Abramowicz, H;
- Abreu, H;
- Abulaiti, Y;
- Acharya, BS;
- Adamczyk, L;
- Adams, DL;
- Addy, TN;
- Adelman, J;
- Adomeit, S;
- Adye, T;
- Aefsky, S;
- Agatonovic-Jovin, T;
- Aguilar-Saavedra, JA;
- Agustoni, M;
- Ahlen, SP;
- Ahmad, A;
- Ahmadov, F;
- Aielli, G;
- Åkesson, TPA;
- Akimoto, G;
- Akimov, AV;
- Alam, MA;
- Albert, J;
- Albrand, S;
- Alconada Verzini, MJ;
- Aleksa, M;
- Aleksandrov, IN;
- Alessandria, F;
- Alexa, C;
- Alexander, G;
- Alexandre, G;
- Alexopoulos, T;
- Alhroob, M;
- Aliev, M;
- Alimonti, G;
- Alio, L;
- Alison, J;
- Allbrooke, BMM;
- Allison, LJ;
- Allport, PP;
- Allwood-Spiers, SE;
- Almond, J;
- Aloisio, A;
- Alon, R;
- Alonso, A;
- Alonso, F;
- Altheimer, A;
- Alvarez Gonzalez, B;
- Alviggi, MG;
- Amako, K;
- Amaral Coutinho, Y;
- Amelung, C;
- Ammosov, VV;
- Amor Dos Santos, SP;
- Amorim, A;
- Amoroso, S;
- Amram, N;
- Amundsen, G;
- Anastopoulos, C;
- Ancu, LS;
- Andari, N;
- Andeen, T;
- Anders, CF;
- Anders, G;
- Anderson, KJ;
- Andreazza, A;
- Andrei, V;
- Anduaga, XS;
- Angelidakis, S;
- Anger, P;
- Angerami, A;
- Anghinolfi, F;
- Anisenkov, AV;
- Anjos, N;
- Annovi, A;
- Antonaki, A;
- Antonelli, M;
- Antonov, A;
- Antos, J;
- Anulli, F;
- Aoki, M;
- Aperio Bella, L;
- Apolle, R;
- Arabidze, G;
- Aracena, I;
- Arai, Y;
- Arce, ATH;
- Arfaoui, S;
- Arguin, JF;
- Argyropoulos, S
- et al.
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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