Search for top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum in (Formula presented.)= 8 TeV pp collisions with the ATLAS detector
Articolo
Data di Pubblicazione:
2014
Abstract:
The results of a search for top squark (stop) pair production in final states
with one isolated lepton, jets, and missing transverse momentum are reported. The analysis
is performed with proton-proton collision data at ps = 8TeV collected with the ATLAS
detector at the LHC in 2012 corresponding to an integrated luminosity of 20 fb−1. The
lightest supersymmetric particle (LSP) is taken to be the lightest neutralino which only
interacts weakly and is assumed to be stable. The stop decay modes considered are those to
a top quark and the LSP as well as to a bottom quark and the lightest chargino, where the
chargino decays to the LSP by emitting a W boson. A wide range of scenarios with different
mass splittings between the stop, the lightest neutralino and the lightest chargino are considered,
including cases where the W bosons or the top quarks are off-shell. Decay modes
involving the heavier charginos and neutralinos are addressed using a set of phenomenological
models of supersymmetry. No significant excess over the Standard Model prediction is
observed. A stop with a mass between 210 and 640GeV decaying directly to a top quark
and a massless LSP is excluded at 95% confidence level, and in models where the mass of
the lightest chargino is twice that of the LSP, stops are excluded at 95% confidence level up
to a mass of 500 GeV for an LSP mass in the range of 100 to 150 GeV. Stringent exclusion
limits are also derived for all other stop decay modes considered, and model-independent
upper limits are set on the visible cross-section for processes beyond the Standard Model.
with one isolated lepton, jets, and missing transverse momentum are reported. The analysis
is performed with proton-proton collision data at ps = 8TeV collected with the ATLAS
detector at the LHC in 2012 corresponding to an integrated luminosity of 20 fb−1. The
lightest supersymmetric particle (LSP) is taken to be the lightest neutralino which only
interacts weakly and is assumed to be stable. The stop decay modes considered are those to
a top quark and the LSP as well as to a bottom quark and the lightest chargino, where the
chargino decays to the LSP by emitting a W boson. A wide range of scenarios with different
mass splittings between the stop, the lightest neutralino and the lightest chargino are considered,
including cases where the W bosons or the top quarks are off-shell. Decay modes
involving the heavier charginos and neutralinos are addressed using a set of phenomenological
models of supersymmetry. No significant excess over the Standard Model prediction is
observed. A stop with a mass between 210 and 640GeV decaying directly to a top quark
and a massless LSP is excluded at 95% confidence level, and in models where the mass of
the lightest chargino is twice that of the LSP, stops are excluded at 95% confidence level up
to a mass of 500 GeV for an LSP mass in the range of 100 to 150 GeV. Stringent exclusion
limits are also derived for all other stop decay modes considered, and model-independent
upper limits are set on the visible cross-section for processes beyond the Standard Model.
Tipologia CRIS:
1.1 Articolo in rivista
Keywords:
Hadron-Hadron Scattering; proton-proton scattering; supersymmetry; top squark; Nuclear and High Energy Physics
Elenco autori:
The ATLAS collaboration, Null; 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.; Arnold, H.; Arratia, M.; Arslan, O.; Artamonov, A.; Artoni, G.; Asai, S.; Asbah, N.; Ashkenazi, A.; Åsman, B.; Asquith, L.; Assamagan, K.; Astalos, R.; Atkinson, M.; Atlay, N. B.; Auerbach, B.; Augsten, K.; Aurousseau, M.; Avolio, G.; Azuelos, G.; Azuma, Y.; Baak, M. A.; Baas, A.; Bacci, C.; Bachacou, H.; Bachas, K.; Backes, M.; Backhaus, M.; Backus Mayes, J.; Badescu, E.; Bagiacchi, P.; Bagnaia, P.; Bai, Y.; Bain, T.; Baines, J. T.; Baker, O. K.; Balek, P.; Balli, F.; Banas, E.; Banerjee, S. w.; Bannoura, A. A. E.; Bansal, V.; Bansil, H. S.; Barak, L.; Baranov, S. P.; Barberio, E. L.; Barberis, D.; Barbero, M.; Barillari, T.; Barisonzi, M.; Barklow, T.; Barlow, N.; Barnett, B. M.; Barnett, R. M.; Barnovska, Z.; Baroncelli, A.; Barone, G.; Barr, A. J.; Barreiro, F.; Barreiro Guimarães da Costa, J.; Bartoldus, R.; Barton, A. E.; Bartos, P.; Bartsch, V.; Bassalat, A.; Basye, A.; Bates, R. L.; Batley, J. R.; Battaglia, M.; Battistin, M.; Bauer, F.; Bawa, H. S.; Beattie, M. D.; Beau, T.; Beauchemin, P. H.; Beccherle, R.; Bechtle, P.; Beck, H. P.; Becker, K.; Becker, S.; Beckingham, M.; Becot, C.; Beddall, A. J.; Beddall, A.; Bedikian, S.; Bednyakov, V. A.; Bee, C. P.; Beemster, L. J.; Beermann, T. A.; Begel, M.; Behr, K.; Belanger Champagne, C.; Bell, P. J.; Bell, W. H.; Bella, G.; Bellagamba, L.; Bellerive, A.; Bellomo, M.; Belotskiy, K.; Beltramello, O.; Benary, O.; Benchekroun, D.; Bendtz, K.; Benekos, N.; Benhammou, Y.; Benhar Noccioli, E.; Benitez Garcia, J. A.; Benjamin, D. P.; Bensinger, J. R.; Benslama, K.; Bentvelsen, S.; Berge, D.; Bergeaas Kuutmann, E.; Berger, N.; Berghaus, F.; Beringer, J.; Bernard, C.; Bernat, P.; Bernius, C.; Bernlochner, F. U.; Berry, T.; Berta, P.; Bertella, C.; Bertoli, G.; Bertolucci, F.; Bertsche, C.; Bertsche, D.; Besana, M. I.; Besjes, G. J.; Bessidskaia, O.; Bessner, M.; Besson, N.; Betancourt, C.; Bethke, S.; Bhimji, W.; Bianchi, R. M.; Bianchini, L.; Bianco, M.; Biebel, O.; Bieniek, S. P.; Bierwagen, K.; Biesiada, J.; Biglietti, M.; Bilbao De Mendizabal, J.; Bilokon, H.; Bindi, M.; Binet, S.; Bingul, A.; Bini, C.; Black, C. W.; Black, J. E.; Black, K. M.; Blackburn, D.; Blair, R. E.; Blanchard, J. B.; Blazek, T.; Bloch, I.; Blocker, C.; Blum, W.; Blumenschein, U.; Bobbink, G. J.; Bobrovnikov, V. S.; Bocchetta, S. S.; Bocci, A.; Bock, C.; Boddy, C. R.; Boehler, M.; Boek, T. T.; Bogaerts, J. A.; Bogdanchikov, A. G.; Bogouch, A.; Bohm, C.; Bohm, J.; Boisvert, V.; Bold, T.; Boldea, V.; Boldyrev, A. S.; Bomben, M
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