Search for Anomalous Wtb Couplings and Flavour-Changing Neutral Currents in t-Channel Single Top Quark Production in Pp Collisions at √s = 7 and 8 TeV
Single top quark events produced in the t channel are used to set limits on anomalous Wtb couplings and to search for top quark flavour-changing neutral current (FCNC) interactions. The data taken with the CMS detector at the LHC in proton-proton collisions at √s = 7 and 8 TeV correspond to integrat...
| _version_ | 1826212004844535808 |
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| author | CMS Collaboration Abercrombie, Daniel Robert Allen, Brandon Leigh Apyan, Aram Barbieri, Richard Alexander Baty, Austin Alan Bi, Ran Bierwagen, Katharina Brandt, Stephanie Akemi Busza, Wit Cali, Ivan Amos Demiragli, Zeynep Di Matteo, Leonardo Gomez-Ceballos, Guillelmo Goncharov, Maxim Hsu, Dylan George Iiyama, Yutaro Innocenti, Gian Michele Klute, Markus Kovalskyi, Dmytro Krajczar, Krisztian F. Lai, Yue Shi Lee, Yen-Jie Levin, Amy Elizabeth Luckey Jr, P David Marini, Andrea Carlo McGinn, Christopher Francis Mironov, Camelia Maria Narayanan, Siddharth Madhavan Niu, Xinmei Paus, Christoph M. E. Roland, Christof E Roland, Gunther M Salfeld-Nebgen, Jakob Maxillian Henry Stephans, George S. F. Sumorok, Konstanty C Tatar, Kaya Varma, Mukund Madhav Velicanu, Dragos Alexandru Veverka, Jan Wang, Jing Wang, Ta-Wei Wyslouch, Boleslaw Yang, Ming Wyslouch, Victoria |
| author2 | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering CMS Collaboration Abercrombie, Daniel Robert Allen, Brandon Leigh Apyan, Aram Barbieri, Richard Alexander Baty, Austin Alan Bi, Ran Bierwagen, Katharina Brandt, Stephanie Akemi Busza, Wit Cali, Ivan Amos Demiragli, Zeynep Di Matteo, Leonardo Gomez-Ceballos, Guillelmo Goncharov, Maxim Hsu, Dylan George Iiyama, Yutaro Innocenti, Gian Michele Klute, Markus Kovalskyi, Dmytro Krajczar, Krisztian F. Lai, Yue Shi Lee, Yen-Jie Levin, Amy Elizabeth Luckey Jr, P David Marini, Andrea Carlo McGinn, Christopher Francis Mironov, Camelia Maria Narayanan, Siddharth Madhavan Niu, Xinmei Paus, Christoph M. E. Roland, Christof E Roland, Gunther M Salfeld-Nebgen, Jakob Maxillian Henry Stephans, George S. F. Sumorok, Konstanty C Tatar, Kaya Varma, Mukund Madhav Velicanu, Dragos Alexandru Veverka, Jan Wang, Jing Wang, Ta-Wei Wyslouch, Boleslaw Yang, Ming Wyslouch, Victoria |
| author_sort | CMS Collaboration |
| collection | MIT |
| description | Single top quark events produced in the t channel are used to set limits on anomalous Wtb couplings and to search for top quark flavour-changing neutral current (FCNC) interactions. The data taken with the CMS detector at the LHC in proton-proton collisions at √s = 7 and 8 TeV correspond to integrated luminosities of 5.0 and 19.7 fb⁻¹, respectively. The analysis is performed using events with one muon and two or three jets. A Bayesian neural network technique is used to discriminate between the signal and backgrounds, which are observed to be consistent with the standard model prediction. The 95% confidence level (CL) exclusion limits on anomalous right-handed vector, and left- and right-handed tensor Wtb couplings are measured to be |fVR| < 0.16, |fTL| < 0.057, and − 0.049 < fTR< 0.048, respectively. For the FCNC couplings κtugand κtcg, the 95% CL upper limits on coupling strengths are |κtug|/Λ < 4.1 × 10⁻³TeV⁻¹and |κtcg|/Λ < 1.8 × 10⁻²TeV⁻¹, where Λ is the scale for new physics, and correspond to upper limits on the branching fractions of 2.0 × 10⁻⁵ and 4.1 × 10⁻⁴ for the decays t → ug and t → cg, respectively. Keywords: Flavour Changing Neutral Currents; Hadron-Hadron scattering (experiments); Top physics |
| first_indexed | 2024-09-23T15:14:58Z |
| format | Article |
| id | mit-1721.1/118581 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T15:14:58Z |
| publishDate | 2018 |
| publisher | Springer Nature |
| record_format | dspace |
| spelling | mit-1721.1/1185812022-10-02T01:38:35Z Search for Anomalous Wtb Couplings and Flavour-Changing Neutral Currents in t-Channel Single Top Quark Production in Pp Collisions at √s = 7 and 8 TeV CMS Collaboration Abercrombie, Daniel Robert Allen, Brandon Leigh Apyan, Aram Barbieri, Richard Alexander Baty, Austin Alan Bi, Ran Bierwagen, Katharina Brandt, Stephanie Akemi Busza, Wit Cali, Ivan Amos Demiragli, Zeynep Di Matteo, Leonardo Gomez-Ceballos, Guillelmo Goncharov, Maxim Hsu, Dylan George Iiyama, Yutaro Innocenti, Gian Michele Klute, Markus Kovalskyi, Dmytro Krajczar, Krisztian F. Lai, Yue Shi Lee, Yen-Jie Levin, Amy Elizabeth Luckey Jr, P David Marini, Andrea Carlo McGinn, Christopher Francis Mironov, Camelia Maria Narayanan, Siddharth Madhavan Niu, Xinmei Paus, Christoph M. E. Roland, Christof E Roland, Gunther M Salfeld-Nebgen, Jakob Maxillian Henry Stephans, George S. F. Sumorok, Konstanty C Tatar, Kaya Varma, Mukund Madhav Velicanu, Dragos Alexandru Veverka, Jan Wang, Jing Wang, Ta-Wei Wyslouch, Boleslaw Yang, Ming Wyslouch, Victoria Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science Abercrombie, Daniel Robert Allen, Brandon Leigh Apyan, Aram Barbieri, Richard Alexander Baty, Austin Alan Bi, Ran Bierwagen, Katharina Brandt, Stephanie Akemi Busza, Wit Cali, Ivan Amos Demiragli, Zeynep Di Matteo, Leonardo Gomez-Ceballos, Guillelmo Goncharov, Maxim Hsu, Dylan George Iiyama, Yutaro Innocenti, Gian Michele Klute, Markus Kovalskyi, Dmytro Krajczar, Krisztian F. Lai, Yue Shi Lee, Yen-Jie Levin, Amy Elizabeth Luckey Jr, P David Marini, Andrea Carlo McGinn, Christopher Francis Mironov, Camelia Maria Narayanan, Siddharth Madhavan Niu, Xinmei Paus, Christoph M. E. Roland, Christof E Roland, Gunther M Salfeld-Nebgen, Jakob Maxillian Henry Stephans, George S. F. Sumorok, Konstanty C Tatar, Kaya Varma, Mukund Madhav Velicanu, Dragos Alexandru Veverka, Jan Wang, Jing Wang, Ta-Wei Wyslouch, Boleslaw Yang, Ming Wyslouch, Victoria Single top quark events produced in the t channel are used to set limits on anomalous Wtb couplings and to search for top quark flavour-changing neutral current (FCNC) interactions. The data taken with the CMS detector at the LHC in proton-proton collisions at √s = 7 and 8 TeV correspond to integrated luminosities of 5.0 and 19.7 fb⁻¹, respectively. The analysis is performed using events with one muon and two or three jets. A Bayesian neural network technique is used to discriminate between the signal and backgrounds, which are observed to be consistent with the standard model prediction. The 95% confidence level (CL) exclusion limits on anomalous right-handed vector, and left- and right-handed tensor Wtb couplings are measured to be |fVR| < 0.16, |fTL| < 0.057, and − 0.049 < fTR< 0.048, respectively. For the FCNC couplings κtugand κtcg, the 95% CL upper limits on coupling strengths are |κtug|/Λ < 4.1 × 10⁻³TeV⁻¹and |κtcg|/Λ < 1.8 × 10⁻²TeV⁻¹, where Λ is the scale for new physics, and correspond to upper limits on the branching fractions of 2.0 × 10⁻⁵ and 4.1 × 10⁻⁴ for the decays t → ug and t → cg, respectively. Keywords: Flavour Changing Neutral Currents; Hadron-Hadron scattering (experiments); Top physics 2018-10-16T14:25:50Z 2018-10-16T14:25:50Z 2017-02 2016-10 2018-09-19T14:55:24Z Article http://purl.org/eprint/type/JournalArticle 1029-8479 http://hdl.handle.net/1721.1/118581 Khachatryan, V. et al. “Search for Anomalous Wtb Couplings and Flavour-Changing Neutral Currents in t-Channel Single Top Quark Production in Pp Collisions at √s = 7 and 8 TeV.” Journal of High Energy Physics 2017, 2 (February 2017): 28 © 2017 The Author(s) https://orcid.org/0000-0003-0293-1944 https://orcid.org/0000-0002-4371-2038 https://orcid.org/0000-0002-9418-6656 https://orcid.org/0000-0002-7945-005X https://orcid.org/0000-0001-5310-3466 https://orcid.org/0000-0003-3951-4634 https://orcid.org/0000-0002-2622-8295 https://orcid.org/0000-0002-8590-2673 https://orcid.org/0000-0002-3831-9071 https://orcid.org/0000-0002-2822-3375 https://orcid.org/0000-0001-8521-737X https://orcid.org/0000-0002-8696-1747 https://orcid.org/0000-0002-8297-5930 https://orcid.org/0000-0003-4511-0855 https://orcid.org/0000-0002-0869-5631 https://orcid.org/0000-0002-6923-293X https://orcid.org/0000-0003-1486-606X https://orcid.org/0000-0003-2593-7767 https://orcid.org/0000-0003-2351-0487 https://orcid.org/0000-0003-1281-0193 https://orcid.org/0000-0002-8599-2437 https://orcid.org/0000-0003-2723-3560 https://orcid.org/0000-0001-7842-1591 https://orcid.org/0000-0002-6047-4211 https://orcid.org/0000-0002-7312-5854 https://orcid.org/0000-0001-8983-2169 https://orcid.org/0000-0003-3879-5622 https://orcid.org/0000-0003-3106-4894 https://orcid.org/0000-0002-6448-0168 https://orcid.org/0000-0001-8261-8346 https://orcid.org/0000-0002-1260-777X https://orcid.org/0000-0001-5259-1883 https://orcid.org/0000-0002-0899-7621 https://orcid.org/0000-0003-3681-0649 https://orcid.org/0000-0002-2850-9007 http://dx.doi.org/10.1007/JHEP02(2017)028 Journal of High Energy Physics Creative Commons Attribution 4.0 International License http://creativecommons.org/licenses/by/4.0/ application/pdf Springer Nature Springer |
| spellingShingle | CMS Collaboration Abercrombie, Daniel Robert Allen, Brandon Leigh Apyan, Aram Barbieri, Richard Alexander Baty, Austin Alan Bi, Ran Bierwagen, Katharina Brandt, Stephanie Akemi Busza, Wit Cali, Ivan Amos Demiragli, Zeynep Di Matteo, Leonardo Gomez-Ceballos, Guillelmo Goncharov, Maxim Hsu, Dylan George Iiyama, Yutaro Innocenti, Gian Michele Klute, Markus Kovalskyi, Dmytro Krajczar, Krisztian F. Lai, Yue Shi Lee, Yen-Jie Levin, Amy Elizabeth Luckey Jr, P David Marini, Andrea Carlo McGinn, Christopher Francis Mironov, Camelia Maria Narayanan, Siddharth Madhavan Niu, Xinmei Paus, Christoph M. E. Roland, Christof E Roland, Gunther M Salfeld-Nebgen, Jakob Maxillian Henry Stephans, George S. F. Sumorok, Konstanty C Tatar, Kaya Varma, Mukund Madhav Velicanu, Dragos Alexandru Veverka, Jan Wang, Jing Wang, Ta-Wei Wyslouch, Boleslaw Yang, Ming Wyslouch, Victoria Search for Anomalous Wtb Couplings and Flavour-Changing Neutral Currents in t-Channel Single Top Quark Production in Pp Collisions at √s = 7 and 8 TeV |
| title | Search for Anomalous Wtb Couplings and Flavour-Changing Neutral Currents in t-Channel Single Top Quark Production in Pp Collisions at √s = 7 and 8 TeV |
| title_full | Search for Anomalous Wtb Couplings and Flavour-Changing Neutral Currents in t-Channel Single Top Quark Production in Pp Collisions at √s = 7 and 8 TeV |
| title_fullStr | Search for Anomalous Wtb Couplings and Flavour-Changing Neutral Currents in t-Channel Single Top Quark Production in Pp Collisions at √s = 7 and 8 TeV |
| title_full_unstemmed | Search for Anomalous Wtb Couplings and Flavour-Changing Neutral Currents in t-Channel Single Top Quark Production in Pp Collisions at √s = 7 and 8 TeV |
| title_short | Search for Anomalous Wtb Couplings and Flavour-Changing Neutral Currents in t-Channel Single Top Quark Production in Pp Collisions at √s = 7 and 8 TeV |
| title_sort | search for anomalous wtb couplings and flavour changing neutral currents in t channel single top quark production in pp collisions at √s 7 and 8 tev |
| url | http://hdl.handle.net/1721.1/118581 https://orcid.org/0000-0003-0293-1944 https://orcid.org/0000-0002-4371-2038 https://orcid.org/0000-0002-9418-6656 https://orcid.org/0000-0002-7945-005X https://orcid.org/0000-0001-5310-3466 https://orcid.org/0000-0003-3951-4634 https://orcid.org/0000-0002-2622-8295 https://orcid.org/0000-0002-8590-2673 https://orcid.org/0000-0002-3831-9071 https://orcid.org/0000-0002-2822-3375 https://orcid.org/0000-0001-8521-737X https://orcid.org/0000-0002-8696-1747 https://orcid.org/0000-0002-8297-5930 https://orcid.org/0000-0003-4511-0855 https://orcid.org/0000-0002-0869-5631 https://orcid.org/0000-0002-6923-293X https://orcid.org/0000-0003-1486-606X https://orcid.org/0000-0003-2593-7767 https://orcid.org/0000-0003-2351-0487 https://orcid.org/0000-0003-1281-0193 https://orcid.org/0000-0002-8599-2437 https://orcid.org/0000-0003-2723-3560 https://orcid.org/0000-0001-7842-1591 https://orcid.org/0000-0002-6047-4211 https://orcid.org/0000-0002-7312-5854 https://orcid.org/0000-0001-8983-2169 https://orcid.org/0000-0003-3879-5622 https://orcid.org/0000-0003-3106-4894 https://orcid.org/0000-0002-6448-0168 https://orcid.org/0000-0001-8261-8346 https://orcid.org/0000-0002-1260-777X https://orcid.org/0000-0001-5259-1883 https://orcid.org/0000-0002-0899-7621 https://orcid.org/0000-0003-3681-0649 https://orcid.org/0000-0002-2850-9007 |
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