Search for Flavor-Changing Neutral Currents in Top-Quark Decays t → Zq in pp Collisions at √s = 8 TeV
A search for flavor-changing neutral currents in top-quark decays t → Zq is performed in events produced from the decay chain t[bar over t] → Zq + Wb, where both vector bosons decay leptonically, producing a final state with three leptons (electrons or muons). A data set collected with the CMS detec...
Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
---|---|
Other Authors: | |
Format: | Article |
Language: | en_US |
Published: |
American Physical Society
2014
|
Online Access: | http://hdl.handle.net/1721.1/88724 https://orcid.org/0000-0002-3831-9071 https://orcid.org/0000-0003-3106-4894 https://orcid.org/0000-0001-6332-5839 https://orcid.org/0000-0001-8983-2169 https://orcid.org/0000-0002-1260-777X https://orcid.org/0000-0002-6047-4211 https://orcid.org/0000-0002-7945-005X https://orcid.org/0000-0003-3681-0649 https://orcid.org/0000-0002-9418-6656 https://orcid.org/0000-0003-1486-606X https://orcid.org/0000-0003-2593-7767 https://orcid.org/0000-0001-9236-6621 https://orcid.org/0000-0002-0869-5631 https://orcid.org/0000-0002-1136-6900 |
_version_ | 1811096549120278528 |
---|---|
author | Apyan, Aram Barbieri, Riccardo Bauer, Gerry P. Busza, Wit Cali, Ivan Amos Chan, M. Di Matteo, Leonardo Dutta, V. Gomez-Ceballos, Guillelmo Goncharov, Maxim Gulhan, Doga Can Klute, Markus Lai, Yue Shi Lee, Y.-J. Levin, A. Luckey, P. David, Jr. Ma, Teng Paus, Christoph M. E. Ralph, Duncan Kelley Roland, Christof E. Roland, Gunther M. Stephans, George S. F. Stockli, Fabian Sumorok, Konstanty C. Velicanu, Dragos Alexandru Veverka, Jan Wyslouch, Boleslaw Yang, M. Yoon, A. S. Zanetti, Marco Zhukova, Victoria |
author2 | Massachusetts Institute of Technology. Department of Physics |
author_facet | Massachusetts Institute of Technology. Department of Physics Apyan, Aram Barbieri, Riccardo Bauer, Gerry P. Busza, Wit Cali, Ivan Amos Chan, M. Di Matteo, Leonardo Dutta, V. Gomez-Ceballos, Guillelmo Goncharov, Maxim Gulhan, Doga Can Klute, Markus Lai, Yue Shi Lee, Y.-J. Levin, A. Luckey, P. David, Jr. Ma, Teng Paus, Christoph M. E. Ralph, Duncan Kelley Roland, Christof E. Roland, Gunther M. Stephans, George S. F. Stockli, Fabian Sumorok, Konstanty C. Velicanu, Dragos Alexandru Veverka, Jan Wyslouch, Boleslaw Yang, M. Yoon, A. S. Zanetti, Marco Zhukova, Victoria |
author_sort | Apyan, Aram |
collection | MIT |
description | A search for flavor-changing neutral currents in top-quark decays t → Zq is performed in events produced from the decay chain t[bar over t] → Zq + Wb, where both vector bosons decay leptonically, producing a final state with three leptons (electrons or muons). A data set collected with the CMS detector at the LHC is used, corresponding to an integrated luminosity of 19.7 fb[superscript −1] of proton-proton collisions at a center-of-mass energy of 8 TeV. No excess is seen in the observed number of events relative to the standard model prediction; thus, no evidence for flavor-changing neutral currents in top-quark decays is found. A combination with a previous search at 7 TeV excludes a t → Zq branching fraction greater than 0.05% at the 95% confidence level. |
first_indexed | 2024-09-23T16:45:08Z |
format | Article |
id | mit-1721.1/88724 |
institution | Massachusetts Institute of Technology |
language | en_US |
last_indexed | 2024-09-23T16:45:08Z |
publishDate | 2014 |
publisher | American Physical Society |
record_format | dspace |
spelling | mit-1721.1/887242022-09-29T21:15:54Z Search for Flavor-Changing Neutral Currents in Top-Quark Decays t → Zq in pp Collisions at √s = 8 TeV Apyan, Aram Barbieri, Riccardo Bauer, Gerry P. Busza, Wit Cali, Ivan Amos Chan, M. Di Matteo, Leonardo Dutta, V. Gomez-Ceballos, Guillelmo Goncharov, Maxim Gulhan, Doga Can Klute, Markus Lai, Yue Shi Lee, Y.-J. Levin, A. Luckey, P. David, Jr. Ma, Teng Paus, Christoph M. E. Ralph, Duncan Kelley Roland, Christof E. Roland, Gunther M. Stephans, George S. F. Stockli, Fabian Sumorok, Konstanty C. Velicanu, Dragos Alexandru Veverka, Jan Wyslouch, Boleslaw Yang, M. Yoon, A. S. Zanetti, Marco Zhukova, Victoria Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science Massachusetts Institute of Technology. School of Science Apyan, Aram Barbieri, Riccardo Bauer, Gerry P. Busza, Wit Cali, Ivan Amos Chan, M. Di Matteo, Leonardo Dutta, V. Gomez-Ceballos, Guillelmo Goncharov, Maxim Gulhan, Doga Can Klute, Markus Lai, Yue Shi Lee, Y.-J. Levin, A. Luckey, P. David, Jr. Ma, Teng Paus, Christoph M. E. Ralph, Duncan Kelley Roland, Christof E. Roland, Gunther M. Stephans, George S. F. Stockli, Fabian Sumorok, Konstanty C. Velicanu, Dragos Alexandru Veverka, Jan Wyslouch, Boleslaw Yang, M. Yoon, A. S. Zanetti, Marco Zhukova, Victoria A search for flavor-changing neutral currents in top-quark decays t → Zq is performed in events produced from the decay chain t[bar over t] → Zq + Wb, where both vector bosons decay leptonically, producing a final state with three leptons (electrons or muons). A data set collected with the CMS detector at the LHC is used, corresponding to an integrated luminosity of 19.7 fb[superscript −1] of proton-proton collisions at a center-of-mass energy of 8 TeV. No excess is seen in the observed number of events relative to the standard model prediction; thus, no evidence for flavor-changing neutral currents in top-quark decays is found. A combination with a previous search at 7 TeV excludes a t → Zq branching fraction greater than 0.05% at the 95% confidence level. United States. Dept. of Energy National Science Foundation (U.S.) 2014-08-15T16:53:34Z 2014-08-15T16:53:34Z 2014-05 2013-12 Article http://purl.org/eprint/type/JournalArticle 0031-9007 1079-7114 http://hdl.handle.net/1721.1/88724 Chatrchyan, S., et al. "Search for Flavor-Changing Neutral Currents in Top-Quark Decays t → Zq in pp Collisions at √s = 8 TeV." Phys. Rev. Lett. 112, 171802 (May 2014). © 2014 CERN, for the CMS Collaboration https://orcid.org/0000-0002-3831-9071 https://orcid.org/0000-0003-3106-4894 https://orcid.org/0000-0001-6332-5839 https://orcid.org/0000-0001-8983-2169 https://orcid.org/0000-0002-1260-777X https://orcid.org/0000-0002-6047-4211 https://orcid.org/0000-0002-7945-005X https://orcid.org/0000-0003-3681-0649 https://orcid.org/0000-0002-9418-6656 https://orcid.org/0000-0003-1486-606X https://orcid.org/0000-0003-2593-7767 https://orcid.org/0000-0001-9236-6621 https://orcid.org/0000-0002-0869-5631 https://orcid.org/0000-0002-1136-6900 en_US http://dx.doi.org/10.1103/PhysRevLett.112.171802 Physical Review Letters Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society American Physical Society |
spellingShingle | Apyan, Aram Barbieri, Riccardo Bauer, Gerry P. Busza, Wit Cali, Ivan Amos Chan, M. Di Matteo, Leonardo Dutta, V. Gomez-Ceballos, Guillelmo Goncharov, Maxim Gulhan, Doga Can Klute, Markus Lai, Yue Shi Lee, Y.-J. Levin, A. Luckey, P. David, Jr. Ma, Teng Paus, Christoph M. E. Ralph, Duncan Kelley Roland, Christof E. Roland, Gunther M. Stephans, George S. F. Stockli, Fabian Sumorok, Konstanty C. Velicanu, Dragos Alexandru Veverka, Jan Wyslouch, Boleslaw Yang, M. Yoon, A. S. Zanetti, Marco Zhukova, Victoria Search for Flavor-Changing Neutral Currents in Top-Quark Decays t → Zq in pp Collisions at √s = 8 TeV |
title | Search for Flavor-Changing Neutral Currents in Top-Quark Decays t → Zq in pp Collisions at √s = 8 TeV |
title_full | Search for Flavor-Changing Neutral Currents in Top-Quark Decays t → Zq in pp Collisions at √s = 8 TeV |
title_fullStr | Search for Flavor-Changing Neutral Currents in Top-Quark Decays t → Zq in pp Collisions at √s = 8 TeV |
title_full_unstemmed | Search for Flavor-Changing Neutral Currents in Top-Quark Decays t → Zq in pp Collisions at √s = 8 TeV |
title_short | Search for Flavor-Changing Neutral Currents in Top-Quark Decays t → Zq in pp Collisions at √s = 8 TeV |
title_sort | search for flavor changing neutral currents in top quark decays t zq in pp collisions at √s 8 tev |
url | http://hdl.handle.net/1721.1/88724 https://orcid.org/0000-0002-3831-9071 https://orcid.org/0000-0003-3106-4894 https://orcid.org/0000-0001-6332-5839 https://orcid.org/0000-0001-8983-2169 https://orcid.org/0000-0002-1260-777X https://orcid.org/0000-0002-6047-4211 https://orcid.org/0000-0002-7945-005X https://orcid.org/0000-0003-3681-0649 https://orcid.org/0000-0002-9418-6656 https://orcid.org/0000-0003-1486-606X https://orcid.org/0000-0003-2593-7767 https://orcid.org/0000-0001-9236-6621 https://orcid.org/0000-0002-0869-5631 https://orcid.org/0000-0002-1136-6900 |
work_keys_str_mv | AT apyanaram searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT barbieririccardo searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT bauergerryp searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT buszawit searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT caliivanamos searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT chanm searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT dimatteoleonardo searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT duttav searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT gomezceballosguillelmo searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT goncharovmaxim searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT gulhandogacan searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT klutemarkus searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT laiyueshi searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT leeyj searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT levina searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT luckeypdavidjr searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT mateng searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT pauschristophme searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT ralphduncankelley searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT rolandchristofe searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT rolandguntherm searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT stephansgeorgesf searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT stocklifabian searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT sumorokkonstantyc searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT velicanudragosalexandru searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT veverkajan searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT wyslouchboleslaw searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT yangm searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT yoonas searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT zanettimarco searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev AT zhukovavictoria searchforflavorchangingneutralcurrentsintopquarkdecaystzqinppcollisionsats8tev |