Search for contact interactions and large extra dimensions in the dilepton channel using proton-proton collisions at [Formula: see text] 8 TeV with the ATLAS detector

• Published in: The European physical journal. C, Particles and fields Vol. 74; no. 12; pp. 3134 - 25
• Main Authors: Aad, G, Abbott, B, Abdallah, J, Abdel Khalek, S, Abdinov, O, Aben, R, Abi, B, Abolins, M, AbouZeid, O S, Abramowicz, H, Abreu, H, Abreu, R, Abulaiti, Y, Acharya, B S, Adamczyk, L, Adams, D L, Adelman, J, Adomeit, S, Adye, T, Agatonovic-Jovin, T, Aguilar-Saavedra, J A, Agustoni, M, Ahlen, S P, Ahmadov, F, Aielli, G, Akerstedt, H, Åkesson, T P A, Akimoto, G, Akimov, A V, Alberghi, G L, Albert, J, Albrand, S, Alconada Verzini, M J, Aleksa, M, Aleksandrov, I N, Alexa, C, Alexander, G, Alexandre, G, Alexopoulos, T, Alhroob, M, Alimonti, G, Alio, L, Alison, J, Allbrooke, B M M, Allison, L J, Allport, P P, Almond, J, Aloisio, A, Alonso, A, Alonso, F, Alpigiani, C, Altheimer, A, Alvarez Gonzalez, B, Alviggi, M G, Amako, K, Amaral Coutinho, Y, Amelung, C, Amidei, D, Amor Dos Santos, S P, Amorim, A, Amoroso, S, Amram, N, Amundsen, G, Anastopoulos, C, Ancu, L S, Andari, N, Andeen, T, Anders, C F, Anders, G, Anderson, K J, Andreazza, A, Andrei, V, Anduaga, X S, Angelidakis, S, Angelozzi, I, Anger, P, Angerami, A, Anghinolfi, F, Anisenkov, A V, 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, Araque, J P, Arce, A T H, Arguin, J-F, Argyropoulos, S, Arik, M, Armbruster, A J, Arnaez, O, Arnal, V
• Format: Journal Article
• Language: English
• Published: France Springer 01.12.2014
• Subjects: Asymmetry; Channels; Collisions; Contact; Detection equipment; Deviation; Invariants; Particle collisions; Protons; Searching; Strings; Texts
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-014-3134-6

A search is conducted for non-resonant new phenomena in dielectron and dimuon final states, originating from either contact interactions or large extra spatial dimensions. The LHC 2012 proton-proton collision dataset recorded by the ATLAS detector is used, corresponding to 20 fb[Formula: see text] at [Formula: see text] = 8 TeV. The dilepton invariant mass spectrum is a discriminating variable in both searches, with the contact interaction search additionally utilizing the dilepton forward-backward asymmetry. No significant deviations from the Standard Model expectation are observed. Lower limits are set on the [Formula: see text] contact interaction scale [Formula: see text] between 15.4 TeV and 26.3 TeV, at the 95 % credibility level. For large extra spatial dimensions, lower limits are set on the string scale [Formula: see text] between 3.2 TeV to 5.0 TeV.