Search for leptoquarks coupled to third-generation quarks in proton-proton collisions at √s=13 TeV
Autor(a) principal: | |
---|---|
Data de Publicação: | 2018 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/194220 |
Resumo: | Three of the most significant measured deviations from standard model predictions, the enhanced decay rate for B → Dð Þτν, hints of lepton universality violation in B → Kð Þll decays, and the anomalous magnetic moment of the muon, can be explained by the existence of leptoquarks (LQs) with large couplings to third-generation quarks and masses at the TeV scale. The existence of these states can be probed at the LHC in high energy proton-proton collisions. A novel search is presented for pair production of LQs coupled to a top quark and a muon using data at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb−1, recorded by the CMS experiment. No deviation from the standard model prediction has been observed and scalar LQs decaying exclusively into tμ are excluded up to masses of 1420 GeV. The results of this search are combined with those from previous searches for LQ decays into tτ and bν, which excluded scalar LQs below masses of 900 and 1080 GeV. Vector LQs are excluded up to masses of 1190 GeV for all possible combinations of branching fractions to tμ, tτ and bν. With this analysis, all relevant couplings of LQs with an electric charge of −1=3 to third-generation quarks are probed for the first time. |
id |
UFRGS-2_6721379fae74ef1df36ec213a1cec143 |
---|---|
oai_identifier_str |
oai:www.lume.ufrgs.br:10183/194220 |
network_acronym_str |
UFRGS-2 |
network_name_str |
Repositório Institucional da UFRGS |
repository_id_str |
|
spelling |
Sirunyan, A. M.Silveira, Gustavo Gil daCMS Collaboration2019-05-15T02:37:28Z20180031-9007http://hdl.handle.net/10183/194220001085285Three of the most significant measured deviations from standard model predictions, the enhanced decay rate for B → Dð Þτν, hints of lepton universality violation in B → Kð Þll decays, and the anomalous magnetic moment of the muon, can be explained by the existence of leptoquarks (LQs) with large couplings to third-generation quarks and masses at the TeV scale. The existence of these states can be probed at the LHC in high energy proton-proton collisions. A novel search is presented for pair production of LQs coupled to a top quark and a muon using data at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb−1, recorded by the CMS experiment. No deviation from the standard model prediction has been observed and scalar LQs decaying exclusively into tμ are excluded up to masses of 1420 GeV. The results of this search are combined with those from previous searches for LQ decays into tτ and bν, which excluded scalar LQs below masses of 900 and 1080 GeV. Vector LQs are excluded up to masses of 1190 GeV for all possible combinations of branching fractions to tμ, tτ and bν. With this analysis, all relevant couplings of LQs with an electric charge of −1=3 to third-generation quarks are probed for the first time.application/pdfengPhysical review letters. Melville. Vol. 121, no. 24 (Dec. 2018), 241802, 19 p.Aceleradores de partículasLeptonsQuarksColisões proton-protonSearch for leptoquarks coupled to third-generation quarks in proton-proton collisions at √s=13 TeVEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSTEXT001085285.pdf.txt001085285.pdf.txtExtracted Texttext/plain92944http://www.lume.ufrgs.br/bitstream/10183/194220/2/001085285.pdf.txt778c12698c89d5e91d2b710ce5a9c4c2MD52ORIGINAL001085285.pdfTexto completo (inglês)application/pdf395246http://www.lume.ufrgs.br/bitstream/10183/194220/1/001085285.pdf03a7c7040d077e55baf750726f578b6eMD5110183/1942202023-08-05 03:37:32.683005oai:www.lume.ufrgs.br:10183/194220Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-08-05T06:37:32Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Search for leptoquarks coupled to third-generation quarks in proton-proton collisions at √s=13 TeV |
title |
Search for leptoquarks coupled to third-generation quarks in proton-proton collisions at √s=13 TeV |
spellingShingle |
Search for leptoquarks coupled to third-generation quarks in proton-proton collisions at √s=13 TeV Sirunyan, A. M. Aceleradores de partículas Leptons Quarks Colisões proton-proton |
title_short |
Search for leptoquarks coupled to third-generation quarks in proton-proton collisions at √s=13 TeV |
title_full |
Search for leptoquarks coupled to third-generation quarks in proton-proton collisions at √s=13 TeV |
title_fullStr |
Search for leptoquarks coupled to third-generation quarks in proton-proton collisions at √s=13 TeV |
title_full_unstemmed |
Search for leptoquarks coupled to third-generation quarks in proton-proton collisions at √s=13 TeV |
title_sort |
Search for leptoquarks coupled to third-generation quarks in proton-proton collisions at √s=13 TeV |
author |
Sirunyan, A. M. |
author_facet |
Sirunyan, A. M. Silveira, Gustavo Gil da CMS Collaboration |
author_role |
author |
author2 |
Silveira, Gustavo Gil da CMS Collaboration |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Sirunyan, A. M. Silveira, Gustavo Gil da CMS Collaboration |
dc.subject.por.fl_str_mv |
Aceleradores de partículas Leptons Quarks Colisões proton-proton |
topic |
Aceleradores de partículas Leptons Quarks Colisões proton-proton |
description |
Three of the most significant measured deviations from standard model predictions, the enhanced decay rate for B → Dð Þτν, hints of lepton universality violation in B → Kð Þll decays, and the anomalous magnetic moment of the muon, can be explained by the existence of leptoquarks (LQs) with large couplings to third-generation quarks and masses at the TeV scale. The existence of these states can be probed at the LHC in high energy proton-proton collisions. A novel search is presented for pair production of LQs coupled to a top quark and a muon using data at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb−1, recorded by the CMS experiment. No deviation from the standard model prediction has been observed and scalar LQs decaying exclusively into tμ are excluded up to masses of 1420 GeV. The results of this search are combined with those from previous searches for LQ decays into tτ and bν, which excluded scalar LQs below masses of 900 and 1080 GeV. Vector LQs are excluded up to masses of 1190 GeV for all possible combinations of branching fractions to tμ, tτ and bν. With this analysis, all relevant couplings of LQs with an electric charge of −1=3 to third-generation quarks are probed for the first time. |
publishDate |
2018 |
dc.date.issued.fl_str_mv |
2018 |
dc.date.accessioned.fl_str_mv |
2019-05-15T02:37:28Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/194220 |
dc.identifier.issn.pt_BR.fl_str_mv |
0031-9007 |
dc.identifier.nrb.pt_BR.fl_str_mv |
001085285 |
identifier_str_mv |
0031-9007 001085285 |
url |
http://hdl.handle.net/10183/194220 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Physical review letters. Melville. Vol. 121, no. 24 (Dec. 2018), 241802, 19 p. |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UFRGS instname:Universidade Federal do Rio Grande do Sul (UFRGS) instacron:UFRGS |
instname_str |
Universidade Federal do Rio Grande do Sul (UFRGS) |
instacron_str |
UFRGS |
institution |
UFRGS |
reponame_str |
Repositório Institucional da UFRGS |
collection |
Repositório Institucional da UFRGS |
bitstream.url.fl_str_mv |
http://www.lume.ufrgs.br/bitstream/10183/194220/2/001085285.pdf.txt http://www.lume.ufrgs.br/bitstream/10183/194220/1/001085285.pdf |
bitstream.checksum.fl_str_mv |
778c12698c89d5e91d2b710ce5a9c4c2 03a7c7040d077e55baf750726f578b6e |
bitstream.checksumAlgorithm.fl_str_mv |
MD5 MD5 |
repository.name.fl_str_mv |
Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS) |
repository.mail.fl_str_mv |
|
_version_ |
1801224965597429760 |