Search for extra dimensions in diphoton events from proton-proton collisions at √s= 7 TeV in the ATLAS detector at the LHC

The large difference between the Planck scale and the electroweak scale, known as the hierarchy problem, is addressed in certain models through the postulate of extra spatial dimensions. A search for evidence of extra spatial dimensions in the diphoton channel has been performed using the full set o...

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Detalles Bibliográficos
Autores: Aad, G., Abajyan, T., Abbott, B., Abdallah, J., Abdel Khalek, S., Abdelalim, A. A., Abdinov, O., Aben, R., Abi, B., Abolins, M., Abouzeid, O. S., Abramowicz, Halina, Abreu, H., Acharya, B. S., Adamczyk, L., Adams, D. L., Addy, T. N., Adelman, J., Adomeit, S., Adragna, P., Adye, T., Aefsky, S., Aguilar Saavedra, Juan Antonio, Agustoni, M., Aharrouche, M., Ahlen, S. P., Ahles, F., Ahmad, A., Ahsan, M., Aielli, G., Akdogan, T., Åkesson, T. P A, Akimoto, G., Akimov, A. V., Alam, M. S., Alam, M. A., Albert, J., Albrand, S., Aleksa, M., Aleksandrov, I. N., Alessandria, F., Alexa, C., Alexander, G., Alexandre, G., Alexopoulos, T., Alhroob, M., Aliev, M., Alimonti, G., Alison, J., Allbrooke, B. M M, Allport, P. P., Allwood-Spiers, S. E., Almond, J., Aloisio, A., Alon, R., Alonso, A., Alonso, F., Altheimer, A., Alvarez Gonzalez, B., Alviggi, M. G., Amako, K., Amelung, C., Ammosov, V. V., Amor Dos Santos, S. P., Amorim, A., Amram, N., Anastopoulos, C., Ancu, L. S., Andari, N., Andeen, T., Anders, C. F., Anders, G., Anderson, K. J., Andreazza, A., Andrei, V., Andrieux, M. L., Anduaga, X. S., Anger, P., Angerami, A., Anghinolfi, F., Anisenkov, A., Anjos, N., Annovi, A., Antonaki, A., Antonelli, M., Antonov, A., Antos, J., Anulli, F., Aoki, M., Aoun, S., Aperio Bella, L., Apolle, R., Terrón Cuadrado, Juan
Tipo de recurso: artículo
Fecha de publicación:2013
País:España
Institución:Universidad Autónoma de Madrid
Repositorio:Biblos-e Archivo. Repositorio Institucional de la UAM
Idioma:inglés
OAI Identifier:oai:repositorio.uam.es:10486/666923
Acceso en línea:http://hdl.handle.net/10486/666923
https://dx.doi.org/10.1088/1367-2630/15/4/043007
Access Level:acceso abierto
Palabra clave:Confidence levels
Hierarchy problem
Integrated luminosity
Invariant-mass spectra
Large Hadron Collider
Proton proton collisions
Spatial dimension
The standard model
Física
Descripción
Sumario:The large difference between the Planck scale and the electroweak scale, known as the hierarchy problem, is addressed in certain models through the postulate of extra spatial dimensions. A search for evidence of extra spatial dimensions in the diphoton channel has been performed using the full set of proton-proton collisions at √s = 7 TeV recorded in 2011 with the ATLAS detector at the CERN Large Hadron Collider. This dataset corresponds to an integrated luminosity of 4.9 fb1. The diphoton invariant mass spectrum is observed to be in good agreement with the Standard Model expectation. In the context of the model proposed by Arkani-Hamed, Dimopoulos and Dvali, 95% confidence level lower limits of between 2.52 and 3.92 TeV are set on the ultraviolet cutoff scale MS depending on the number of extra dimensions and the theoretical formalism used. In the context of the Randall-Sundrum model, a lower limit of 2.06 (1.00) TeV at 95% confidence level is set on the mass of the lightest graviton for couplings of k/MPl = 0.1(0.01). Combining with the ATLAS dilepton searches based on the 2011 data, the 95% confidence level lower limit on the Randall-Sundrum graviton mass is further tightened to 2.23 (1.03) TeV for k/ MPl= 0.1(0.01)

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