Search for resonances decaying into top-quark pairs using fully hadronic decays in pp collisions with ATLAS at √s=7 TeV
Journal of High Energy Physics 2013:1 (2013)
Authors:
G Aad, T Abajyan, B Abbott, J Abdallah, S Abdel Khalek, AA Abdelalim, O Abdinov, R Aben, B Abi, M Abolins, OS Abouzeid, H Abramowicz, H Abreu, BS Acharya, L Adamczyk, DL Adams, TN Addy, J Adelman, S Adomeit, P Adragna, T Adye, S Aefsky, JA Aguilar-Saavedra, M Agustoni, M Aharrouche, SP Ahlen, F Ahles, A Ahmad, M Ahsan, G Aielli, TPA Åkesson, G Akimoto, AV Akimov, MS Alam, MA Alam, J Albert, S Albrand, M Aleksa, IN Aleksandrov, F Alessandria, C Alexa, G Alexander, G Alexandre, T Alexopoulos, M Alhroob, M Aliev, G Alimonti, J Alison, BMM Allbrooke, PP Allport, SE Allwood-Spiers, J Almond, A Aloisio, R Alon, A Alonso, F Alonso, A Altheimer, B Alvarez Gonzalez, MG Alviggi, K Amako, C Amelung, VV Ammosov, SP Amor Dos Santos, A Amorim, N Amram, C Anastopoulos, LS Ancu, N Andari, T Andeen, CF Anders, G Anders, KJ Anderson, A Andreazza, V Andrei, ML Andrieux, XS Anduaga, S Angelidakis, P Anger, A Angerami, F Anghinolfi, A Anisenkov, N Anjos, A Annovi, A Antonaki, M Antonelli, A Antonov, J Antos, F Anulli, M Aoki, S Aoun, L Aperio Bella, R Apolle, G Arabidze, I Aracena, Y Arai, ATH Arce, S Arfaoui, JF Arguin, S Argyropoulos, E ArikAbstract:
A search for resonances produced in 7 TeV proton-proton collisions and decaying into top-quark pairs is described. In this Letter events where the top-quark decay produces two massive jets with large transverse momenta recorded with the ATLAS detector at the Large Hadron Collider are considered. Two techniques that rely on jet substructure are used to separate top-quark jets from those arising from light quarks and gluons. In addition, each massive jet is required to have evidence of an associated bottom-quark decay. The data are consistent with the Standard Model, and limits can be set on the production cross section times branching fraction of a Z′ boson and a Kaluza-Klein gluon resonance. These limits exclude, at the 95% credibility level, Z′ bosons with masses 0.70-1.00 TeV as well as 1.28-1.32 TeV and Kaluza-Klein gluons with masses 0.70-1.62 TeV. © 2013 Cern for the benefit of the ATLAS collaboration.Measurement of the Λb0 lifetime and mass in the ATLAS experiment
Physical Review D - Particles, Fields, Gravitation and Cosmology 87:3 (2013)
Authors:
G Aad, T Abajyan, B Abbott, J Abdallah, S Abdel Khalek, AA Abdelalim, O Abdinov, R Aben, B Abi, M Abolins, OS Abouzeid, H Abramowicz, H Abreu, E Acerbi, BS Acharya, L Adamczyk, DL Adams, TN Addy, J Adelman, S Adomeit, P Adragna, T Adye, S Aefsky, JA Aguilar-Saavedra, M Agustoni, M Aharrouche, SP Ahlen, F Ahles, A Ahmad, M Ahsan, G Aielli, T Akdogan, TPA Åkesson, G Akimoto, AV Akimov, MS Alam, MA Alam, J Albert, S Albrand, M Aleksa, IN Aleksandrov, F Alessandria, C Alexa, G Alexander, G Alexandre, T Alexopoulos, M Alhroob, M Aliev, G Alimonti, J Alison, BMM Allbrooke, PP Allport, SE Allwood-Spiers, J Almond, A Aloisio, R Alon, A Alonso, F Alonso, B Alvarez Gonzalez, MG Alviggi, K Amako, C Amelung, VV Ammosov, A Amorim, N Amram, C Anastopoulos, LS Ancu, N Andari, T Andeen, CF Anders, G Anders, KJ Anderson, A Andreazza, V Andrei, XS Anduaga, P Anger, A Angerami, F Anghinolfi, A Anisenkov, N Anjos, A Annovi, A Antonaki, M Antonelli, A Antonov, J Antos, F Anulli, M Aoki, S Aoun, L Aperio Bella, R Apolle, G Arabidze, I Aracena, Y Arai, ATH Arce, S Arfaoui, JF Arguin, E Arik, M Arik, AJ Armbruster, O ArnaezAbstract:
A measurement of the Λb0 lifetime and mass in the decay channel Λb0→J/ψ(μ+μ-)Λ0(pπ -) is presented. The analysis uses a signal sample of about 2200 Λb0 and Λ̄b0 decays that are reconstructed in 4.9 fb -1 of ATLAS pp collision data collected in 2011 at the LHC center-of-mass energy of 7 TeV. A simultaneous mass and decay time maximum likelihood fit is used to extract the Λb0 lifetime and mass. They are measured to be τΛb=1.449±0.036(stat) ±0.017(syst) ps and mΛb=5619.7±0. 7(stat)±1.1(syst) MeV.Search for the neutral Higgs bosons of the minimal supersymmetric standard model in pp collisions at TeV with the ATLAS detector
Journal of High Energy Physics Springer Nature 2013:2 (2013) 95
Authors:
The ATLAS collaboration, G Aad, T Abajyan, B Abbott, J Abdallah, S Abdel Khalek, AA Abdelalim, O Abdinov, R Aben, B Abi, M Abolins, OS AbouZeid, H Abramowicz, H Abreu, BS Acharya, L Adamczyk, DL Adams, TN Addy, J Adelman, S Adomeit, P Adragna, T Adye, S Aefsky, JA Aguilar-Saavedra, M Agustoni, SP Ahlen, F Ahles, A Ahmad, M Ahsan, G Aielli, TPA Åkesson, G Akimoto, AV Akimov, MA Alam, J Albert, S Albrand, M Aleksa, IN Aleksandrov, F Alessandria, C Alexa, G Alexander, G Alexandre, T Alexopoulos, M Alhroob, M Aliev, G Alimonti, J Alison, BMM Allbrooke, LJ Allison, PP Allport, SE Allwood-Spiers, J Almond, A Aloisio, R Alon, A Alonso, F Alonso, A Altheimer, B Alvarez Gonzalez, MG Alviggi, K Amako, C Amelung, VV Ammosov, SP Amor Dos Santos, A Amorim, S Amoroso, N Amram, C Anastopoulos, LS Ancu, N Andari, T Andeen, CF Anders, G Anders, KJ Anderson, A Andreazza, V Andrei, M-L Andrieux, XS Anduaga, S Angelidakis, P Anger, A Angerami, F Anghinolfi, A Anisenkov, N Anjos, A Annovi, A Antonaki, M Antonelli, A Antonov, J Antos, F Anulli, M Aoki, S Aoun, L Aperio Bella, R Apolle, G Arabidze, I Aracena, Y Arai, ATH Arce, S Arfaoui, J-F Arguin, S Argyropoulos, E Arik, M Arik, AJ Armbruster, O Arnaez, V Arnal, A Artamonov, G Artoni, D Arutinov, S Asai, S Ask, B Åsman, L Asquith, K Assamagan, A Astbury, M Atkinson, B Aubert, E Auge, K Augsten, M Aurousseau, G Avolio, D Axen, G Azuelos, Y Azuma, MA Baak, G Baccaglioni, C Bacci, AM Bach, H Bachacou, K Bachas, M Backes, M Backhaus, J Backus Mayes, E Badescu, P Bagnaia, Y Bai, DC Bailey, T Bain, JT Baines, OK Baker, S Baker, P Balek, E Banas, P Banerjee, Sw Banerjee, D Banfi, A Bangert, V Bansal, HS Bansil, L Barak, SP Baranov, T Barber, EL Barberio, D Barberis, M Barbero, DY Bardin, T Barillari, M Barisonzi, T Barklow, N Barlow, BM Barnett, RM Barnett, A Baroncelli, G Barone, AJ Barr, F Barreiro, J Barreiro Guimarães da Costa, R Bartoldus, AE Barton, V Bartsch, A Basye, RL Bates, L Batkova, JR Batley, A Battaglia, M Battistin, F Bauer, HS Bawa, S Beale, T Beau, PH Beauchemin, R Beccherle, P Bechtle, HP Beck, K Becker, S Becker, M Beckingham, KH Becks, AJ Beddall, A Beddall, S Bedikian, VA Bednyakov, CP Bee, LJ Beemster, M Begel, S Behar Harpaz, PK Behera, M Beimforde, C Belanger-Champagne, PJ Bell, WH Bell, G Bella, L Bellagamba, M Bellomo, A Belloni, O Beloborodova, K Belotskiy, O Beltramello, O Benary, D Benchekroun, K Bendtz, N Benekos, Y Benhammou, E Benhar Noccioli, JA Benitez Garcia, DP Benjamin, M Benoit, JR Bensinger, K Benslama, S Bentvelsen, D Berge, E Bergeaas Kuutmann, N Berger, F Berghaus, E Berglund, J Beringer, P Bernat, R Bernhard, C Bernius, T Berry, C Bertella, A Bertin, F Bertolucci, MI Besana, GJ Besjes, N Besson, S Bethke, W Bhimji, RM Bianchi, L Bianchini, M Bianco, O Biebel, SP Bieniek, K Bierwagen, J Biesiada, M Biglietti, H Bilokon, M Bindi, S Binet, A Bingul, C Bini, C Biscarat, B Bittner, CW Black, KM Black, RE Blair, J-B Blanchard, T Blazek, I Bloch, C Blocker, J Blocki, W Blum, U Blumenschein, GJ Bobbink, VS Bobrovnikov, SS Bocchetta, A Bocci, CR Boddy, M Boehler, J Boek, TT Boek, N Boelaert, JA Bogaerts, A Bogdanchikov, A Bogouch, C Bohm, J Bohm, V Boisvert, T Bold, V Boldea, NM Bolnet, M Bomben, M Bona, M Boonekamp, S Bordoni, C Borer, A Borisov, G Borissov, I Borjanovic, M Borri, S Borroni, J Bortfeldt, V Bortolotto, K Bos, D Boscherini, M Bosman, H Boterenbrood, J Bouchami, J Boudreau, EV Bouhova-Thacker, D Boumediene, C Bourdarios, N Bousson, A Boveia, J Boyd, IR Boyko, I Bozovic-Jelisavcic, J Bracinik, P Branchini, A Brandt, G Brandt, O Brandt, U Bratzler, B Brau, JE Brau, HM Braun, SF Brazzale, B Brelier, J Bremer, K Brendlinger, R Brenner, S Bressler, TM Bristow, D Britton, FM Brochu, I Brock, R Brock, F Broggi, C Bromberg, J Bronner, G Brooijmans, T Brooks, WK Brooks, G Brown, PA Bruckman de Renstrom, D Bruncko, R Bruneliere, S Brunet, A Bruni, G Bruni, M Bruschi, L Bryngemark, T Buanes, Q Buat, F Bucci, J Buchanan, P Buchholz, RM Buckingham, AG Buckley, SI Buda, IA Budagov, B Budick, V Büscher, L Bugge, O Bulekov, AC Bundock, M Bunse, T Buran, H Burckhart, S Burdin, T Burgess, S Burke, E Busato, P Bussey, CP Buszello, B Butler, JM Butler, CM Buttar, JM Butterworth, W Buttinger, M Byszewski, S Cabrera Urbán, D Caforio, O Cakir, P Calafiura, G Calderini, P Calfayan, R Calkins, LP Caloba, R Caloi, D Calvet, S Calvet, R Camacho Toro, P Camarri, D Cameron, LM Caminada, R Caminal Armadans, S Campana, M Campanelli, V Canale, F Canelli, A Canepa, J Cantero, R Cantrill, MDM Capeans Garrido, I Caprini, M Caprini, D Capriotti, M Capua, R Caputo, R Cardarelli, T Carli, G Carlino, L Carminati, S Caron, E Carquin, GD Carrillo-Montoya, AA Carter, JR Carter, J Carvalho, D Casadei, MP Casado, M Cascella, C Caso, AM Castaneda Hernandez, E Castaneda-Miranda, V Castillo Gimenez, NF Castro, G Cataldi, P Catastini, A Catinaccio, JR Catmore, A Cattai, G Cattani, S Caughron, V Cavaliere, P Cavalleri, D Cavalli, M Cavalli-Sforza, V Cavasinni, F Ceradini, AS Cerqueira, A Cerri, L Cerrito, F Cerutti, SA Cetin, A Chafaq, D Chakraborty, I Chalupkova, K Chan, P Chang, B Chapleau, JD Chapman, JW Chapman, DG Charlton, V Chavda, CA Chavez Barajas, S Cheatham, S Chekanov, SV Chekulaev, GA Chelkov, MA Chelstowska, C Chen, H Chen, S Chen, X Chen, Y Chen, Y Cheng, A Cheplakov, R Cherkaoui El Moursli, V Chernyatin, E Cheu, SL Cheung, L Chevalier, G Chiefari, L Chikovani, JT Childers, A Chilingarov, G Chiodini, AS Chisholm, RT Chislett, A Chitan, MV Chizhov, G Choudalakis, S Chouridou, IA Christidi, A Christov, D Chromek-Burckhart, ML Chu, J Chudoba, G Ciapetti, AK Ciftci, R Ciftci, D Cinca, V Cindro, A Ciocio, M Cirilli, P Cirkovic, ZH Citron, M Citterio, M Ciubancan, A Clark, PJ Clark, RN Clarke, W Cleland, JC Clemens, B Clement, C Clement, Y Coadou, M Cobal, A Coccaro, J Cochran, L Coffey, JG Cogan, J Coggeshall, J Colas, S Cole, AP Colijn, NJ Collins, C Collins-Tooth, J Collot, T Colombo, G Colon, G Compostella, P Conde Muiño, E Coniavitis, MC Conidi, SM Consonni, V Consorti, S Constantinescu, C Conta, G Conti, F Conventi, M Cooke, BD Cooper, AM Cooper-Sarkar, K Copic, T Cornelissen, M Corradi, F Corriveau, A Cortes-Gonzalez, G Cortiana, G Costa, MJ Costa, D Costanzo, D Côté, L Courneyea, G Cowan, BE Cox, K Cranmer, F Crescioli, M Cristinziani, G Crosetti, S Crépé-Renaudin, C-M Cuciuc, C Cuenca Almenar, T Cuhadar Donszelmann, J Cummings, M Curatolo, CJ Curtis, C Cuthbert, P Cwetanski, H Czirr, P Czodrowski, Z Czyczula, S D’Auria, M D’Onofrio, A D’Orazio, MJ Da Cunha Sargedas De Sousa, C Da Via, W Dabrowski, A Dafinca, T Dai, F Dallaire, C Dallapiccola, M Dam, M Dameri, DS Damiani, HO Danielsson, V Dao, G Darbo, GL Darlea, JA Dassoulas, W Davey, T Davidek, N Davidson, R Davidson, E Davies, M Davies, O Davignon, AR Davison, Y Davygora, E Dawe, I Dawson, RK Daya-Ishmukhametova, K De, R de Asmundis, S De Castro, S De Cecco, J de Graat, N De Groot, P de Jong, C De La Taille, H De la Torre, F De Lorenzi, L De Nooij, D De Pedis, A De Salvo, U De Sanctis, A De Santo, JB De Vivie De Regie, G De Zorzi, WJ Dearnaley, R Debbe, C Debenedetti, B Dechenaux, DV Dedovich, J Degenhardt, J Del Peso, T Del Prete, T Delemontex, M Deliyergiyev, A Dell’Acqua, L Dell’Asta, M Della Pietra, D della Volpe, M Delmastro, PA Delsart, C Deluca, S Demers, M Demichev, B Demirkoz, SP Denisov, D Derendarz, JE Derkaoui, F Derue, P Dervan, K Desch, E Devetak, PO Deviveiros, A Dewhurst, B DeWilde, S Dhaliwal, R Dhullipudi, A Di Ciaccio, L Di Ciaccio, C Di Donato, A Di Girolamo, B Di Girolamo, S Di Luise, A Di Mattia, B Di Micco, R Di Nardo, A Di Simone, R Di Sipio, MA Diaz, EB Diehl, J Dietrich, TA Dietzsch, S Diglio, K Dindar Yagci, J Dingfelder, F Dinut, C Dionisi, P Dita, S Dita, F Dittus, F Djama, T Djobava, MAB do Vale, A Do Valle Wemans, TKO Doan, M Dobbs, D Dobos, E Dobson, J Dodd, C Doglioni, T Doherty, Y Doi, J Dolejsi, Z Dolezal, BA Dolgoshein, T Dohmae, M Donadelli, J Donini, J Dopke, A Doria, A Dos Anjos, A Dotti, MT Dova, AD Doxiadis, AT Doyle, N Dressnandt, M Dris, J Dubbert, S Dube, E Dubreuil, E Duchovni, G Duckeck, D Duda, A Dudarev, F Dudziak, M Dührssen, IP Duerdoth, L Duflot, M-A Dufour, L Duguid, M Dunford, H Duran Yildiz, R Duxfield, M Dwuznik, M Düren, WL Ebenstein, J Ebke, S Eckweiler, W Edson, CA Edwards, NC Edwards, W Ehrenfeld, T Eifert, G Eigen, K Einsweiler, E Eisenhandler, T Ekelof, M El Kacimi, M Ellert, S Elles, F Ellinghaus, K Ellis, N Ellis, J Elmsheuser, M Elsing, D Emeliyanov, R Engelmann, A Engl, B Epp, J Erdmann, A Ereditato, D Eriksson, J Ernst, M Ernst, J Ernwein, D Errede, S Errede, E Ertel, M Escalier, H Esch, C Escobar, X Espinal Curull, B Esposito, F Etienne, AI Etienvre, E Etzion, D Evangelakou, H Evans, L Fabbri, C Fabre, RM Fakhrutdinov, S Falciano, Y Fang, M Fanti, A Farbin, A Farilla, J Farley, T Farooque, S Farrell, SM Farrington, P Farthouat, F Fassi, P Fassnacht, D Fassouliotis, B Fatholahzadeh, A Favareto, L Fayard, P Federic, OL Fedin, W Fedorko, M Fehling-Kaschek, L Feligioni, C Feng, EJ Feng, AB Fenyuk, J Ferencei, W Fernando, S Ferrag, J Ferrando, V Ferrara, A Ferrari, P Ferrari, R Ferrari, DE Ferreira de Lima, A Ferrer, D Ferrere, C Ferretti, A Ferretto Parodi, M Fiascaris, F Fiedler, A Filipčič, F Filthaut, M Fincke-Keeler, MCN Fiolhais, L Fiorini, A Firan, G Fischer, MJ Fisher, EA Fitzgerald, M Flechl, I Fleck, J Fleckner, P Fleischmann, S Fleischmann, G Fletcher, T Flick, A Floderus, LR Flores Castillo, AC Florez Bustos, MJ Flowerdew, T Fonseca Martin, A Formica, A Forti, D Fortin, D Fournier, AJ Fowler, H Fox, P Francavilla, M Franchini, S Franchino, D Francis, T Frank, M Franklin, S Franz, M Fraternali, S Fratina, ST French, C Friedrich, F Friedrich, D Froidevaux, JA Frost, C Fukunaga, E Fullana Torregrosa, BG Fulsom, J Fuster, C Gabaldon, O Gabizon, T Gadfort, S Gadomski, G Gagliardi, P Gagnon, C Galea, B Galhardo, EJ Gallas, V Gallo, BJ Gallop, P Gallus, KK Gan, YS Gao, A Gaponenko, F Garberson, M Garcia-Sciveres, C García, JE García Navarro, RW Gardner, N Garelli, V Garonne, C Gatti, G Gaudio, B Gaur, L Gauthier, P Gauzzi, IL Gavrilenko, C Gay, G Gaycken, EN Gazis, P Ge, Z Gecse, CNP Gee, DAA Geerts, Ch Geich-Gimbel, K Gellerstedt, C Gemme, A Gemmell, MH Genest, S Gentile, M George, S George, D Gerbaudo, P Gerlach, A Gershon, C Geweniger, H Ghazlane, N Ghodbane, B Giacobbe, S Giagu, V Giangiobbe, F Gianotti, B Gibbard, A Gibson, SM Gibson, M Gilchriese, D Gillberg, AR Gillman, DM Gingrich, J Ginzburg, N Giokaris, MP Giordani, R Giordano, FM Giorgi, P Giovannini, PF Giraud, D Giugni, M Giunta, BK Gjelsten, LK Gladilin, C Glasman, J Glatzer, A Glazov, GL Glonti, JR Goddard, J Godfrey, J Godlewski, M Goebel, T Göpfert, C Goeringer, C Gössling, S Goldfarb, T Golling, D Golubkov, A Gomes, LS Gomez Fajardo, R Gonçalo, J Goncalves Pinto Firmino Da Costa, L Gonella, S González de la Hoz, G Gonzalez Parra, ML Gonzalez Silva, S Gonzalez-Sevilla, JJ Goodson, L Goossens, PA Gorbounov, HA Gordon, I Gorelov, G Gorfine, B Gorini, E Gorini, A Gorišek, E Gornicki, AT Goshaw, M Gosselink, MI Gostkin, I Gough Eschrich, M Gouighri, D Goujdami, MP Goulette, AG Goussiou, C Goy, S Gozpinar, I Grabowska-Bold, P Grafström, K-J Grahn, E Gramstad, F Grancagnolo, S Grancagnolo, V Grassi, V Gratchev, HM Gray, JA Gray, E Graziani, OG Grebenyuk, T Greenshaw, ZD Greenwood, K Gregersen, IM Gregor, P Grenier, J Griffiths, N Grigalashvili, AA Grillo, K Grimm, S Grinstein, Ph Gris, YV Grishkevich, J-F Grivaz, A Grohsjean, E Gross, J Grosse-Knetter, J Groth-Jensen, K Grybel, D Guest, C Guicheney, E Guido, T Guillemin, S Guindon, U Gul, J Gunther, B Guo, J Guo, P Gutierrez, N Guttman, O Gutzwiller, C Guyot, C Gwenlan, CB Gwilliam, A Haas, S Haas, C Haber, HK Hadavand, DR Hadley, P Haefner, F Hahn, Z Hajduk, H Hakobyan, D Hall, G Halladjian, K Hamacher, P Hamal, K Hamano, M Hamer, A Hamilton, S Hamilton, L Han, K Hanagaki, K Hanawa, M Hance, C Handel, P Hanke, JR Hansen, JB Hansen, JD Hansen, PH Hansen, P Hansson, K Hara, T Harenberg, S Harkusha, D Harper, RD Harrington, OM Harris, J Hartert, F Hartjes, T Haruyama, A Harvey, S Hasegawa, Y Hasegawa, S Hassani, S Haug, M Hauschild, R Hauser, M Havranek, CM Hawkes, RJ Hawkings, AD Hawkins, T Hayakawa, T Hayashi, D Hayden, CP Hays, HS Hayward, SJ Haywood, SJ Head, V Hedberg, L Heelan, S Heim, B Heinemann, S Heisterkamp, L Helary, C Heller, M Heller, S Hellman, D Hellmich, C Helsens, RCW Henderson, M Henke, A Henrichs, AM Henriques Correia, S Henrot-Versille, C Hensel, CM Hernandez, Y Hernández Jiménez, R Herrberg, G Herten, R Hertenberger, L Hervas, GG Hesketh, NP Hessey, R Hickling, E Higón-Rodriguez, JC Hill, KH Hiller, S Hillert, SJ Hillier, I Hinchliffe, E Hines, M Hirose, F Hirsch, D Hirschbuehl, J Hobbs, N Hod, MC Hodgkinson, P Hodgson, A Hoecker, MR Hoeferkamp, J Hoffman, D Hoffmann, M Hohlfeld, M Holder, SO Holmgren, T Holy, JL Holzbauer, TM Hong, L Hooft van Huysduynen, S Horner, J-Y Hostachy, S Hou, A Hoummada, J Howard, J Howarth, I Hristova, J Hrivnac, T Hryn’ova, PJ Hsu, S-C Hsu, D Hu, Z Hubacek, F Hubaut, F Huegging, A Huettmann, TB Huffman, EW Hughes, G Hughes, M Huhtinen, M Hurwitz, N Huseynov, J Huston, J Huth, G Iacobucci, G Iakovidis, M Ibbotson, I Ibragimov, L Iconomidou-Fayard, J Idarraga, P Iengo, O Igonkina, Y Ikegami, M Ikeno, D Iliadis, N Ilic, T Ince, P Ioannou, M Iodice, K Iordanidou, V Ippolito, A Irles Quiles, C Isaksson, M Ishino, M Ishitsuka, R Ishmukhametov, C Issever, S Istin, AV Ivashin, W Iwanski, H Iwasaki, JM Izen, V Izzo, B Jackson, JN Jackson, P Jackson, MR Jaekel, V Jain, K Jakobs, S Jakobsen, T Jakoubek, J Jakubek, DO Jamin, DK Jana, E Jansen, H Jansen, J Janssen, A Jantsch, M Janus, RC Jared, G Jarlskog, L Jeanty, I Jen-La Plante, G-Y Jeng, D Jennens, P Jenni, AE Loevschall-Jensen, P Jež, S Jézéquel, MK Jha, H Ji, W Ji, J Jia, Y Jiang, M Jimenez Belenguer, S Jin, O Jinnouchi, MD Joergensen, D Joffe, M Johansen, KE Johansson, P Johansson, S Johnert, KA Johns, K Jon-And, G Jones, RWL 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C Zeitnitz, M Zeman, A Zemla, O Zenin, T Ženiš, Z Zinonos, D Zerwas, G Zevi della Porta, D Zhang, H Zhang, J Zhang, X Zhang, Z Zhang, L Zhao, Z Zhao, A Zhemchugov, J Zhong, B Zhou, N Zhou, Y Zhou, CG Zhu, H Zhu, J Zhu, Y Zhu, X Zhuang, V Zhuravlov, A Zibell, D Zieminska, NI Zimin, R Zimmermann, S Zimmermann, S Zimmermann, M Ziolkowski, R Zitoun, L Živković, VV Zmouchko, G Zobernig, A Zoccoli, M zur Nedden, V Zutshi, L ZwalinskiSearch for pair production of heavy top-like quarks decaying to a high-pT W boson and a b quark in the lepton plus jets final state at s=7TeV with the ATLAS detector
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 718:4-5 (2013) 1284-1302
Authors:
G Aad, T Abajyan, B Abbott, J Abdallah, S Abdel Khalek, AA Abdelalim, O Abdinov, R Aben, B Abi, M Abolins, OS AbouZeid, H Abramowicz, H Abreu, BS Acharya, BS Acharya, L Adamczyk, DL Adams, TN Addy, J Adelman, S Adomeit, P Adragna, T Adye, S Aefsky, JA Aguilar-Saavedra, M Agustoni, M Aharrouche, SP Ahlen, F Ahles, A Ahmad, M Ahsan, G Aielli, G Aielli, TPA Åkesson, G Akimoto, AV Akimov, MS Alam, MA Alam, J Albert, S Albrand, M Aleksa, IN Aleksandrov, F Alessandria, C Alexa, G Alexander, G Alexandre, T Alexopoulos, M Alhroob, M Alhroob, M Aliev, G Alimonti, J Alison, BMM Allbrooke, PP Allport, SE Allwood-Spiers, J Almond, A Aloisio, A Aloisio, R Alon, A Alonso, F Alonso, A Altheimer, B Alvarez Gonzalez, MG Alviggi, MG Alviggi, K Amako, C Amelung, VV Ammosov, SP Amor Dos Santos, A Amorim, N Amram, C Anastopoulos, LS Ancu, N Andari, T Andeen, CF Anders, G Anders, KJ Anderson, A Andreazza, A Andreazza, V Andrei, ML Andrieux, XS Anduaga, S Angelidakis, P Anger, A Angerami, F Anghinolfi, A Anisenkov, N Anjos, A Annovi, A Antonaki, M Antonelli, A Antonov, J Antos, F Anulli, M Aoki, S Aoun, L Aperio Bella, R Apolle, G Arabidze, I AracenaAbstract:
A search is presented for production of a heavy up-type quark (t') together with its antiparticle, assuming a significant branching ratio for subsequent decay into a W boson and a b quark. The search is based on 4.7 fb-1 of pp collisions at s=7TeV recorded in 2011 with the ATLAS detector at the CERN Large Hadron Collider. Data are analyzed in the lepton+jets final state, characterized by a high-transverse-momentum isolated electron or muon, large missing transverse momentum and at least three jets. The analysis strategy relies on the substantial boost of the W bosons in the t't̄' signal when mt'≳400GeV. No significant excess of events above the Standard Model expectation is observed and the result of the search is interpreted in the context of fourth-generation and vector-like quark models. Under the assumption of a branching ratio BR(t'→Wb)=1, a fourth-generation t' quark with mass lower than 656GeV is excluded at 95% confidence level. In addition, in light of the recent discovery of a new boson of mass ~126GeV at the LHC, upper limits are derived in the two-dimensional plane of BR(t'→Wb) versus BR(t'→Ht), where H is the Standard Model Higgs boson, for vector-like quarks of various masses. © 2012 CERN.Search for pair production of heavy top-like quarks decaying to a high-pT W boson and a b quark in the lepton plus jets final state at s=7TeV with the ATLAS detector
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 718:4-5 (2013) 1284-1302