Search for 3- and 4-body decays of the scalar top quark in p collisions at = 1.8 TeV

Abazov, V. M.; Abbott, B.; Abdesselam, A.; Abolins, M.; Abramov, V.; Acharya, B. S.; Adams, T.; Adams, M. R.; Ahmed, S.; Alexeev, G. D.; Alton, A.; Alves, G. A.; Anderson, E. W.; Arnoud, Y.; Ávila, C.; Babintsev, V.; Babukhadia, L.; Bacon, T. C.; Baden, A.; Baffioni, S.; Baldin, B.; Balm, P. W.; Banerjee, S.; Barberis, E.; Baringer, P.; Barreto, J.; Bartlett, J. F.; Bassler, U.; Bauer, D.; Bean, A.; Beaudette, F.; Begel, M.; Belyaev, A.; Beri, S. B.; Bernardi, G.; Bertram, I.; Besson, A.; Beuselinck, R.; Bezzubov, V. A.; Bhat, P. C.; Bhatnagar, V.; Bhattacharjee, M.; Blazey, G.; Blekman, F.; Blessing, S.; Boehnlein, A.; Bojko, N. I.; Bolton, T.; Borcherding, F.; Bos, K.; Bose, T.; Brandt, A.; Breedon, R.; Briskin, G.; Brock, R.; Brooijmans, G.; Bross, A.; Buchholz, D.; Buehler, M.; Buescher, V.; Буртовой, В. С.; Butler, J. M.; Canelli, F.; Carvalho, W.; Casey, D.; Castilla‐Valdez, H.; Chakraborty, D.; Chan, K. M.; Chekulaev, S. V.; Cho, D. K.; Choi, S.; Chopra, S.; Claes, D. R.; Clark, A. R.; Coney, L.; Connolly, B.; Cooper, W. E.; Coppage, D.; Cŕéṕe-Renaudin, S.; Cummings, M. A.C.; Ćutts, D.; Motta, H. da; Davis, G. A.; De, K.; Jong, S. J. De; Demarteau, M.; Démina, R.; Demine, P.; Denisov, D.; Denisov, S. P.; Desai, S.; Diehl, H. T.; Diesburg, M.; Doulas, S.; Dudko, L.; Duensing, S.; Duflot, L.; Dugad, S.; Duperrin, A.; Dyshkant, A.; Edmunds, D.; Ellison, J.; Eltzroth, J. T.; Elvira, V. D.; Engelmann, R.; Eno, S.; Eppley, G.; Ermolov, P.; Eroshin, O. V.; Estrada, J.; Evans, H.; Evdokimov, V. N.; Fein, D.; Ferbel, T.; Filthaut, F.; Fisk, H. E.; Fleuret, F.; Fortner, M.; Fox, H.; Fu, S.; Fuess, S.; Gallas, E. J.; Galyaev, A. N.; Gao, M.; Gavrilov, V.; Genik, R. J.; Genser, K.; Gerber, C. E.; Gershtein, Y.; Ginther, G.; Gómez, B.; Goncharov, P. I.; Gordon, H. A.; Gounder, K.; Goussiou, A. G.; Graf, N.; Grannis, P. D.; Green, J. A.; Greenlee, H.; Greenwood, Z. D.; Grinstein, S.; Groer, L.; Grünendahl, S.; Gurzhiev, S. N.; Gutiérrez, G.; Gutiérrez, P.; Hadley, N. J.; Haggerty, H.; Hagopian, S.; Hagopian, V.; Hall, R. E.; Han, C.; Hansen, S.; Hauptman, J. M.; Hébert, C.; Hedin, D.; Heinmiller, J. M.; Heinson, A. P.; Heintz, U.; Hildreth, M.; Hirosky, R.; Hobbs, J.; Hoeneisen, B.; Huang, J. S.; Huang, Y.; Iashvili, I.; Illingworth, R.; Ito, A. S.; Jaffré, M.; Jain, Sa.; Jesik, R.; Johns, K. A.; Johnson, M.; Jonckheere, A.; Jöstlein, H.; Rozas, A. Juste; Kahl, W.; Kahn, S.; Kajfasz, E.; Калинин, А.; Karmanov, D.; Karmgard, Daniel John; Kehoe, R.; Khanov, A.; Kharchilava, A.; Klima, B.; Ko, W.; Kohli, J. M.; Kostritskiy, A. V.; Kotcher, J.; Kothari, B.; Kozelov, A. V.; Kozlovsky, E. A.; Krane, J.; Krishnaswamy, M. R.; Krivkova, P.; Krzywdziński, S.; Kubantsev, M.; Kuleshov, S.; Kulik, Y.; Kunori, S.; Kupčo, A.; Кузнецов, В. Е.; Landsberg, G.; Lee, W. M.; Leflat, A.; Lehner, F.; Leonidopoulos, C.; Li, J.; Li, Q. Z.; Lima, J. G.R.; Lincoln, D.; Linn, S.; Linnemann, J.; Lipton, R.; Lucotte, A.; Lueking, L.; Lundstedt, C.; Luo, C.; Maciel, A. K.A.; Madaras, R. J.; Malyshev, V. L.; Manankov, V.; Mao, H. S.; Marshall, T.; Martin, M.; Mayorov, A. A.; McCarthy, R. L.; McMahon, T. R.; Melanson, H. L.; Merkin, M.; Merritt, K. W.; Miao, C.; Miettinen, H.; Mihalcea, D.; Mokhov, N.; Mondal, N. K.; Montgomery, H. E.; Moore, R. W.; Mutaf, Y. D.; Nagy, E.; Nang, F.; Narain, M.; Narasimham, V. S.; Naumann, N. A.; Neal, H. A.; Negret, J. P.; Nomerotski, A.; Nunnemann, T.; O’Neil, D. C.; Oguri, V.; Olivier, B.; Oshima, N.; Padley, P.; Παπαγεωργίου, Κ.; Parashar, N.; Partridge, R.; Parua, N.; Patwa, A.; Peters, O.; Pétroff, P.; Piegaia, R.; Pope, B. G.; Popkov, E.; Prosper, H.; Protopopescu, S.; Przybycień, M.; Qian, J.; Raja, R.; Rajagopalan, S.; Rapidis, P. A.; Reay, N. W.; Reucroft, S.; Ridel, M.; Rijssenbeek, M.; Rizatdinova, F.; Rockwell, T.; Royon, C.; Rubinov, P.; Ruchti, R.; Сабиров, Б. М.; Sajot, G.; Santoro, A.; Sawyer, L.; Schamberger, R. D.; Schellman, H.; Schwartzman, A.; Shabalina, E.; Shivpuri, R. K.; Shpakov, D.; Shupe, M. A.; Sidwell, R. A.; Šimák, V.; Sirotenko, V.; Slattery, P.; Smith, R. P.; Snow, G. R.; Snow, J.; Snyder, S.; Solomon, J.; Song, Y. X.; Sorı́n, V.; Sosebee, M.; Sotnikova, N.; Soustružnı́k, K.; Souza, M.; Stanton, N. R.; Steinbrück, G.; Stoker, D. P.; Stolin, V.; Stone, A.; Stoyanova, D. A.; Strang, M.; Strauss, M.; Strovink, M.; Stutte, L.; Sznajder, A.; Talby, M.; Taylor, W.; Tentindo-Repond, S.; Tripathi, S. M.; Trippe, T. G.; Turcot, A. S.; Tuts, P. M.; Kooten, R. Van; Vaniev, V.; Varelas, N.; Villeneuve-Seguier, F.; Volkov, A.; Vorobiev, A. P.; Wahl, H. D.; Wang, Z. M.; Warchol, J.; Watts, G.; Wayne, M.; Weerts, H.; White, A.; Whiteson, D.; Wijngaarden, D. A.; Willis, S.; Wimpenny, S.; Womersley, J.; Wood, D.; Xu, Q.; Yamada, R.; Yamin, P.; Yasuda, T.; Yatsunenko, Y. A.; Yip, K.; Youssef, S.; Yu, J.; Zanabria, M.; Zhang, X.; Zheng, Hua; Zhou, B.; Zhou, Z.; Zieliński, M.; Ziemińska, D.; Ziemiński, A.; Zutshi, V.; Zverev, E. G.; Zylberstejn, A.

doi:10.1016/j.physletb.2003.12.001

Cited by 12 publications

(6 citation statements)

References 26 publications

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“…Throughout this paper the term "lepton" refers only to e ± and µ ± . Previous searches for low mass top squarks in leptonic final states have been conducted by the D0, CDF, CMS, and ATLAS collaborations [6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Search for direct pair production of scalar top quarks in the single- and dilepton channels in proton-proton collisions at s = 8 $$ \sqrt{s}=8 $$ TeV

Khachatryan¹,

Erbacher²,

Montoya³

et al. 2016

J. High Energ. Phys.

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Results are reported from a search for the top squark t 1 , the lighter of the two supersymmetric partners of the top quark. The data sample corresponds to 19.7 fb −1 of proton-proton collisions at √ s = 8 TeV collected with the CMS detector at the LHC.The search targets t 1 → b χ ± 1 and t 1 → t ( * ) χ 0 1 decay modes, where χ ± 1 and χ 0 1 are the lightest chargino and neutralino, respectively. The reconstructed final state consists of jets, b jets, missing transverse energy, and either one or two leptons. Leading backgrounds are determined from data. No significant excess in data is observed above the expectation from standard model processes. The results exclude a region of the two-dimensional plane of possible t 1 and χ 0 1 masses. The highest excluded t 1 and χ 0 1 masses are about 700 GeV and 250 GeV, respectively.

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Section: Introductionmentioning

confidence: 99%

Search for direct pair production of scalar top quarks in the single- and dilepton channels in proton-proton collisions at s = 8 $$ \sqrt{s}=8 $$ TeV

Khachatryan¹,

Erbacher²,

Montoya³

et al. 2016

J. High Energ. Phys.

Self Cite

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“…The search is designed for the case of direct top-squark pair production with subsequent decay of the top squarks into the lightest supersymmetric particle (LSP) and a top quark. Several searches for such a scenario have been performed at TeVatron as well as at the LHC [25][26][27][28][29][30][31][32]. After preselection of the data, the remaining dominant background is given by top-antitop (tt) quark production.…”

Section: Third Generation Supersymmetric Partner Searchmentioning

confidence: 99%

Performance and optimization of support vector machines in high-energy physics classification problems

Sahin

Krücker

Melzer-Pellmann

2016

Nuclear Instruments and Methods in Physics Research Section A:

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In this paper we promote the use of Support Vector Machines (SVM) as a machine learning tool for searches in high-energy physics. As an example for a newphysics search we discuss the popular case of Supersymmetry at the Large Hadron Collider. We demonstrate that the SVM is a valuable tool and show that an automated discoverysignificance based optimization of the SVM hyper-parameters is a highly efficient way to prepare an SVM for such applications. A new C++ LIBSVM interface called SVM-HINT is developed and available on Github.

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“…The kinematically forbidden region is represented in the upper left part of the plot. The regions excluded by LEP I and LEP II [6], by previous DØ searches [46,50] and by a previous CDF search [47] are also shown. …”

Section: Gluino Mass (Gev)mentioning

confidence: 99%

The Hunt for Supersymmetry at the Tevatron

Sopczak

2014

Symmetry

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During the Tevatron data-taking period from April 2001 to September 2011 (Run-II), several searches for supersymmetric particles were performed. The results from searches by the CDF and DØ collaborations are concisely reviewed. This includes results up to the summer conferences of 2013. Model-independent and model-dependent limits on new particle production are set, and interpretations in supersymmetric models are given. Several limits from the Large Electron Positron (LEP) era have been extended. Specific results are placed into the context of the Tevatron performance expectations and a few of the current results from searches at the Large Hadron Collider (LHC).

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Search for 3- and 4-body decays of the scalar top quark in p collisions at = 1.8 TeV

Cited by 12 publications

References 26 publications

Search for direct pair production of scalar top quarks in the single- and dilepton channels in proton-proton collisions at s = 8 $$ \sqrt{s}=8 $$ TeV

Search for direct pair production of scalar top quarks in the single- and dilepton channels in proton-proton collisions at s = 8 $$ \sqrt{s}=8 $$ TeV

Performance and optimization of support vector machines in high-energy physics classification problems

The Hunt for Supersymmetry at the Tevatron

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