Search for contact interactions and large extra dimensions in the dilepton channel using proton–proton collisions at s= 8 TeV with the ATLAS detector

• Published in: The European physical journal. C, Particles and fields Vol. 74; no. 12
• Main Authors: Abbott, B., Alexander, G., Alonso, A., Anastopoulos, C., Angelidakis, S., Arguin, J-F., Bauer, F., Bernlochner, F. U., Bertsche, D., Binet, S., Blazek, T., Bortolotto, V., Brelier, B., Bugge, L., Buttinger, W., Byszewski, M., Caloba, L. P., Cardarelli, R., Cavaliere, V., Cavalli, D., Chavez Barajas, C. A., Chekanov, S., Chekulaev, S. V., Chen, C., Da Cunha Sargedas De Sousa, M. J., De Lorenzi, F., Deliot, F., Galea, C., Garonne, V., Gee, C. N. P., Grahn, K-J., Grohs, J. P., Guo, J., Haas, A., Hariri, F., Iliadis, D., Iwasaki, H., Jansen, H., Joshi, K. D., Kersten, S., King, S. B., Kuze, M., Ladygin, E., Lampl, W., Lassnig, M., Lehan, A., Leonhardt, K., Lester, C. M., Li, B., Liu, L., Loddenkoetter, T., Long, B. A., Lou, X., Lu, N., Magradze, E., Marti-Garcia, S., Mengarelli, A., Mergelmeyer, S., Mikenberg, G., Minaenko, A. A., Mir, L. M., Monnier, E., Mudd, R. D., Namasivayam, H., Naumann, T., Negri, G., Nomidis, I., Ochi, A., Oh, A., Ouchrif, M., Palka, M., Parker, M. A., Pastore, F., Peng, H., Piegaia, R., Rose, P., Rudolph, C., Ryabov, Y. F., Savage, G., Schaetzel, S., Scuri, F., Shmeleva, A., Socher, F., St. Denis, R. D., Stonjek, S., Strauss, M., Succurro, A., Sykora, T., Tanaka, R., Tarem, S., Tikhonov, Yu. A., Tsuno, S., Unverdorben, C., Vacavant, L., von der Schmitt, H., Wang, S. M., Wiedenmann, W., Wolter, M. W., Yamamura, T., Yen, A. L.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 11.12.2014; Springer Nature B.V; Springer Berlin/Heidelberg; Springer Verlag (Germany); Springer
• Subjects: Astronomy; Astrophysics and Cosmology; Elementary Particles; Hadrons; Heavy Ions; High Energy Physics - Experiment; Large Hadron Collider; Measurement Science and Instrumentation; Nuclear Energy; Nuclear Physics; Particle collisions; Physics; Physics and Astronomy; Protons; Quantum Field Theories; Quantum Field Theory; Regular Article - Experimental Physics; Searching; String Theory
• 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 - 1 at s = 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 ℓ ℓ q q contact interaction scale Λ 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 M S between 3.2 TeV to 5.0 TeV.