Analysis of events with b-jets and a pair of leptons of the same charge in pp collisions at √s = 8 TeV with the ATLAS detector

G. Aad; B. Abbott; J. Abdallah; O. Abdinov; R. Aben; M. Abolins; O. S. AbouZeid; H. Abramowicz; H. Abreu; R. Abreu; Y. Abulaiti; B. S. Acharya; L. Adamczyk; D. L. Adams; J. Adelman; S. Adomeit; T. Adye; A. A. Affolder; T. Agatonovic-Jovin; J. A. Aguilar-Saavedra; M. Agustoni; S. P. Ahlen; F. Ahmadov; G. Aielli; H. Akerstedt; T. P. A. Åkesson; G. Akimoto; A. V. Akimov; G. L. Alberghi; J. Albert; S. Albrand; M. J. Alconada Verzini; M. Aleksa; I. N. Aleksandrov; C. Alexa; G. Alexander; T. Alexopoulos; M. Alhroob; G. Alimonti; L. Alio; J. Alison; S. P. Alkire; B. M. M. Allbrooke; P. P. Allport; A. Aloisio; A. Alonso; F. Alonso; C. Alpigiani; A. Altheimer; D. Álvarez Piqueras; M. G. Alviggi; Y. Amaral Coutinho; A. J. Bevan; R. M. Bianchi; L. Bianchini; O. Biebel; S. P. Bieniek; M. Biglietti; H. Bilokon; S. Binet; A. Bingul; C. W. Black; J. E. Black; K. M. Black; D. Blackburn; R. E. Blair; J.-B. Blanchard; J. E. Blanco; T. Blazek; I. Bloch; C. Blocker; W. Blum; U. Blumenschein; G. J. Bobbink; V. S. Bobrovnikov; S. S. Bocchetta; A. Bocci; C. Bock; M. Boehler; J. A. Bogaerts; A. G. Bogdanchikov; C. Bohm; V. Boisvert; V. Boldea; A. S. Boldyrev; M. Bona; M. Boonekamp; M. Bosman; J. Bouffard; S. Boutouil; J. Boyd; I. Bozic; J. Bracinik; A. Brandt; G. Brandt; O. Brandt; U. Bratzler; B. Brau; J. E. Brau; Alejandro Alonso Diaz; Mogens Dam; Gorm Aske Gram Krohn Galster; Jørgen Beck Hansen; Jørn Dines Hansen; Peter Henrik Hansen; Morten Dam Jørgensen; Ask Emil Løvschall-Jensen; James William Monk; Simon Stark Mortensen; Lars Egholm Pedersen; Troels Christian Petersen; Almut Maria Pingel; Lotte Ansgaard Thomsen; Graig Wiglesworth; Stefania Xella

doi:10.1007/JHEP10(2015)150

Analysis of events with b-jets and a pair of leptons of the same charge in pp collisions at √s = 8 TeV with the ATLAS detector

G. Aad, B. Abbott, J. Abdallah, O. Abdinov, R. Aben, M. Abolins, O. S. AbouZeid, H. Abramowicz, H. Abreu, R. Abreu, Y. Abulaiti, B. S. Acharya, L. Adamczyk, D. L. Adams, J. Adelman, S. Adomeit, T. Adye, A. A. Affolder, T. Agatonovic-Jovin, J. A. Aguilar-SaavedraM. Agustoni, S. P. Ahlen, F. Ahmadov, G. Aielli, H. Akerstedt, T. P. A. Åkesson, G. Akimoto, A. V. Akimov, G. L. Alberghi, J. Albert, S. Albrand, M. J. Alconada Verzini, M. Aleksa, I. N. Aleksandrov, C. Alexa, G. Alexander, T. Alexopoulos, M. Alhroob, G. Alimonti, L. Alio, J. Alison, S. P. Alkire, B. M. M. Allbrooke, P. P. Allport, A. Aloisio, A. Alonso, F. Alonso, C. Alpigiani, A. Altheimer, D. Álvarez Piqueras, M. G. Alviggi, Y. Amaral Coutinho, A. J. Bevan, R. M. Bianchi, L. Bianchini, O. Biebel, S. P. Bieniek, M. Biglietti, H. Bilokon, S. Binet, A. Bingul, C. W. Black, J. E. Black, K. M. Black, D. Blackburn, R. E. Blair, J.-B. Blanchard, J. E. Blanco, T. Blazek, I. Bloch, C. Blocker, W. Blum, U. Blumenschein, G. J. Bobbink, V. S. Bobrovnikov, S. S. Bocchetta, A. Bocci, C. Bock, M. Boehler, J. A. Bogaerts, A. G. Bogdanchikov, C. Bohm, V. Boisvert, V. Boldea, A. S. Boldyrev, M. Bona, M. Boonekamp, M. Bosman, J. Bouffard, S. Boutouil, J. Boyd, I. Bozic, J. Bracinik, A. Brandt, G. Brandt, O. Brandt, U. Bratzler, B. Brau, J. E. Brau, Alejandro Alonso Diaz, Mogens Dam, Gorm Aske Gram Krohn Galster, Jørgen Beck Hansen, Jørn Dines Hansen, Peter Henrik Hansen, Morten Dam Jørgensen, Ask Emil Løvschall-Jensen, James William Monk, Simon Stark Mortensen, Lars Egholm Pedersen, Troels Christian Petersen, Almut Maria Pingel, Lotte Ansgaard Thomsen, Graig Wiglesworth, Stefania Xella

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Abstract

An analysis is presented of events containing jets including at least one b-tagged jet, sizeable missing transverse momentum, and at least two leptons including a pair of the same electric charge, with the scalar sum of the jet and lepton transverse momenta being large. A data sample with an integrated luminosity of 20.3 fb⁻¹ of pp collisions at √s = 8 TeV recorded by the ATLAS detector at the Large Hadron Collider is used. Standard Model processes rarely produce these final states, but there are several models of physics beyond the Standard Model that predict an enhanced rate of production of such events; the ones considered here are production of vector-like quarks, enhanced four-top-quark production, pair production of chiral b′-quarks, and production of two positively charged top quarks. Eleven signal regions are defined; subsets of these regions are combined when searching for each class of models. In the three signal regions primarily sensitive to positively charged top quark pair production, the data yield is consistent with the background expectation. There are more data events than expected from background in the set of eight signal regions defined for searching for vector-like quarks and chiral b′-quarks, but the significance of the discrepancy is less than two standard deviations. The discrepancy reaches 2.5 standard deviations in the set of five signal regions defined for searching for four-top-quark production. The results are used to set 95% CL limits on various models.

Originalsprog	Engelsk
Artikelnummer	150
Tidsskrift	Journal of High Energy Physics (Online)
Vol/bind	2015
Udgave nummer	10
Antal sider	50
ISSN	1126-6708
DOI	https://doi.org/10.1007/JHEP10(2015)150
Status	Udgivet - 1 okt. 2015

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10.1007/JHEP10(2015)150Licens: CC BY

ATLAS_2015_Analysis_of_events_with_b-jetsForlagets udgivne version, 1,19 MBLicens: CC BY

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Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Aben, R., Abolins, M., AbouZeid, O. S., Abramowicz, H., Abreu, H., Abreu, R., Abulaiti, Y., Acharya, B. S., Adamczyk, L., Adams, D. L., Adelman, J., Adomeit, S., Adye, T., Affolder, A. A., Agatonovic-Jovin, T., ... Xella, S. (2015). Analysis of events with b-jets and a pair of leptons of the same charge in pp collisions at √s = 8 TeV with the ATLAS detector. Journal of High Energy Physics (Online), 2015(10), [150]. https://doi.org/10.1007/JHEP10(2015)150

Aad, G, Abbott, B, Abdallah, J, Abdinov, O, Aben, R, Abolins, M, AbouZeid, OS, Abramowicz, H, Abreu, H, Abreu, R, Abulaiti, Y, Acharya, BS, Adamczyk, L, Adams, DL, Adelman, J, Adomeit, S, Adye, T, Affolder, AA, Agatonovic-Jovin, T, Aguilar-Saavedra, JA, Agustoni, M, Ahlen, SP, Ahmadov, F, Aielli, G, Akerstedt, H, Åkesson, TPA, Akimoto, G, Akimov, AV, Alberghi, GL, Albert, J, Albrand, S, Alconada Verzini, MJ, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexander, G, Alexopoulos, T, Alhroob, M, Alimonti, G, Alio, L, Alison, J, Alkire, SP, Allbrooke, BMM, Allport, PP, Aloisio, A, Alonso, A, Alonso, F, Alpigiani, C, Altheimer, A, Álvarez Piqueras, D, Alviggi, MG, Amaral Coutinho, Y, Bevan, AJ, Bianchi, RM, Bianchini, L, Biebel, O, Bieniek, SP, Biglietti, M, Bilokon, H, Binet, S, Bingul, A, Black, CW, Black, JE, Black, KM, Blackburn, D, Blair, RE, Blanchard, J-B, Blanco, JE, Blazek, T, Bloch, I, Blocker, C, Blum, W, Blumenschein, U, Bobbink, GJ, Bobrovnikov, VS, Bocchetta, SS, Bocci, A, Bock, C, Boehler, M, Bogaerts, JA, Bogdanchikov, AG, Bohm, C, Boisvert, V, Boldea, V, Boldyrev, AS, Bona, M, Boonekamp, M, Bosman, M, Bouffard, J, Boutouil, S, Boyd, J, Bozic, I, Bracinik, J, Brandt, A, Brandt, G, Brandt, O, Bratzler, U, Brau, B, Brau, JE, Alonso Diaz, A, Dam, M, Galster, GAGK, Hansen, JB , Hansen, JD , Hansen, PH, Jørgensen, MD, Løvschall-Jensen, AE, Monk, JW, Mortensen, SS, Pedersen, LE, Petersen, TC, Pingel, AM, Thomsen, LA, Wiglesworth, G & Xella, S 2015, 'Analysis of events with b-jets and a pair of leptons of the same charge in pp collisions at √s = 8 TeV with the ATLAS detector', Journal of High Energy Physics (Online), bind 2015, nr. 10, 150. https://doi.org/10.1007/JHEP10(2015)150

@article{15db98dede154efcba39be4b97f84de2,

title = "Analysis of events with b-jets and a pair of leptons of the same charge in pp collisions at √s = 8 TeV with the ATLAS detector",

abstract = "An analysis is presented of events containing jets including at least one b-tagged jet, sizeable missing transverse momentum, and at least two leptons including a pair of the same electric charge, with the scalar sum of the jet and lepton transverse momenta being large. A data sample with an integrated luminosity of 20.3 fb−1 of pp collisions at √s = 8 TeV recorded by the ATLAS detector at the Large Hadron Collider is used. Standard Model processes rarely produce these final states, but there are several models of physics beyond the Standard Model that predict an enhanced rate of production of such events; the ones considered here are production of vector-like quarks, enhanced four-top-quark production, pair production of chiral b′-quarks, and production of two positively charged top quarks. Eleven signal regions are defined; subsets of these regions are combined when searching for each class of models. In the three signal regions primarily sensitive to positively charged top quark pair production, the data yield is consistent with the background expectation. There are more data events than expected from background in the set of eight signal regions defined for searching for vector-like quarks and chiral b′-quarks, but the significance of the discrepancy is less than two standard deviations. The discrepancy reaches 2.5 standard deviations in the set of five signal regions defined for searching for four-top-quark production. The results are used to set 95% CL limits on various models.",

author = "G. Aad and B. Abbott and J. Abdallah and O. Abdinov and R. Aben and M. Abolins and AbouZeid, {O. S.} and H. Abramowicz and H. Abreu and R. Abreu and Y. Abulaiti and Acharya, {B. S.} and L. Adamczyk and Adams, {D. L.} and J. Adelman and S. Adomeit and T. Adye and Affolder, {A. A.} and T. Agatonovic-Jovin and Aguilar-Saavedra, {J. A.} and M. Agustoni and Ahlen, {S. P.} and F. Ahmadov and G. Aielli and H. Akerstedt and {\AA}kesson, {T. P. A.} and G. Akimoto and Akimov, {A. V.} and Alberghi, {G. L.} and J. Albert and S. Albrand and {Alconada Verzini}, {M. J.} and M. Aleksa and Aleksandrov, {I. N.} and C. Alexa and G. Alexander and T. Alexopoulos and M. Alhroob and G. Alimonti and L. Alio and J. Alison and Alkire, {S. P.} and Allbrooke, {B. M. M.} and Allport, {P. P.} and A. Aloisio and A. Alonso and F. Alonso and C. Alpigiani and A. Altheimer and {{\'A}lvarez Piqueras}, D. and Alviggi, {M. G.} and {Amaral Coutinho}, Y. and Bevan, {A. J.} and Bianchi, {R. M.} and L. Bianchini and O. Biebel and Bieniek, {S. P.} and M. Biglietti and H. Bilokon and S. Binet and A. Bingul and Black, {C. W.} and Black, {J. E.} and Black, {K. M.} and D. Blackburn and Blair, {R. E.} and J.-B. Blanchard and Blanco, {J. E.} and T. Blazek and I. Bloch and C. Blocker and W. Blum and U. Blumenschein and Bobbink, {G. J.} and Bobrovnikov, {V. S.} and Bocchetta, {S. S.} and A. Bocci and C. Bock and M. Boehler and Bogaerts, {J. A.} and Bogdanchikov, {A. G.} and C. Bohm and V. Boisvert and V. Boldea and Boldyrev, {A. S.} and M. Bona and M. Boonekamp and M. Bosman and J. Bouffard and S. Boutouil and J. Boyd and I. Bozic and J. Bracinik and A. Brandt and G. Brandt and O. Brandt and U. Bratzler and B. Brau and Brau, {J. E.} and {Alonso Diaz}, Alejandro and Mogens Dam and Galster, {Gorm Aske Gram Krohn} and Hansen, {J{\o}rgen Beck} and Hansen, {J{\o}rn Dines} and Hansen, {Peter Henrik} and J{\o}rgensen, {Morten Dam} and L{\o}vschall-Jensen, {Ask Emil} and Monk, {James William} and Mortensen, {Simon Stark} and Pedersen, {Lars Egholm} and Petersen, {Troels Christian} and Pingel, {Almut Maria} and Thomsen, {Lotte Ansgaard} and Graig Wiglesworth and Stefania Xella",

year = "2015",

month = oct,

day = "1",

doi = "10.1007/JHEP10(2015)150",

language = "English",

volume = "2015",

journal = "Journal of High Energy Physics (Online)",

issn = "1126-6708",

publisher = "Springer",

number = "10",

}

TY - JOUR

T1 - Analysis of events with b-jets and a pair of leptons of the same charge in pp collisions at √s = 8 TeV with the ATLAS detector

AU - Aad, G.

AU - Abbott, B.

AU - Abdallah, J.

AU - Abdinov, O.

AU - Aben, R.

AU - Abolins, M.

AU - AbouZeid, O. S.

AU - Abramowicz, H.

AU - Abreu, H.

AU - Abreu, R.

AU - Abulaiti, Y.

AU - Acharya, B. S.

AU - Adamczyk, L.

AU - Adams, D. L.

AU - Adelman, J.

AU - Adomeit, S.

AU - Adye, T.

AU - Affolder, A. A.

AU - Agatonovic-Jovin, T.

AU - Aguilar-Saavedra, J. A.

AU - Agustoni, M.

AU - Ahlen, S. P.

AU - Ahmadov, F.

AU - Aielli, G.

AU - Akerstedt, H.

AU - Åkesson, T. P. A.

AU - Akimoto, G.

AU - Akimov, A. V.

AU - Alberghi, G. L.

AU - Albert, J.

AU - Albrand, S.

AU - Alconada Verzini, M. J.

AU - Aleksa, M.

AU - Aleksandrov, I. N.

AU - Alexa, C.

AU - Alexander, G.

AU - Alexopoulos, T.

AU - Alhroob, M.

AU - Alimonti, G.

AU - Alio, L.

AU - Alison, J.

AU - Alkire, S. P.

AU - Allbrooke, B. M. M.

AU - Allport, P. P.

AU - Aloisio, A.

AU - Alonso, A.

AU - Alonso, F.

AU - Alpigiani, C.

AU - Altheimer, A.

AU - Álvarez Piqueras, D.

AU - Alviggi, M. G.

AU - Amaral Coutinho, Y.

AU - Bevan, A. J.

AU - Bianchi, R. M.

AU - Bianchini, L.

AU - Biebel, O.

AU - Bieniek, S. P.

AU - Biglietti, M.

AU - Bilokon, H.

AU - Binet, S.

AU - Bingul, A.

AU - Black, C. W.

AU - Black, J. E.

AU - Black, K. M.

AU - Blackburn, D.

AU - Blair, R. E.

AU - Blanchard, J.-B.

AU - Blanco, J. E.

AU - Blazek, T.

AU - Bloch, I.

AU - Blocker, C.

AU - Blum, W.

AU - Blumenschein, U.

AU - Bobbink, G. J.

AU - Bobrovnikov, V. S.

AU - Bocchetta, S. S.

AU - Bocci, A.

AU - Bock, C.

AU - Boehler, M.

AU - Bogaerts, J. A.

AU - Bogdanchikov, A. G.

AU - Bohm, C.

AU - Boisvert, V.

AU - Boldea, V.

AU - Boldyrev, A. S.

AU - Bona, M.

AU - Boonekamp, M.

AU - Bosman, M.

AU - Bouffard, J.

AU - Boutouil, S.

AU - Boyd, J.

AU - Bozic, I.

AU - Bracinik, J.

AU - Brandt, A.

AU - Brandt, G.

AU - Brandt, O.

AU - Bratzler, U.

AU - Brau, B.

AU - Brau, J. E.

AU - Alonso Diaz, Alejandro

AU - Dam, Mogens

AU - Galster, Gorm Aske Gram Krohn

AU - Hansen, Jørgen Beck

AU - Hansen, Jørn Dines

AU - Hansen, Peter Henrik

AU - Jørgensen, Morten Dam

AU - Løvschall-Jensen, Ask Emil

AU - Monk, James William

AU - Mortensen, Simon Stark

AU - Pedersen, Lars Egholm

AU - Petersen, Troels Christian

AU - Pingel, Almut Maria

AU - Thomsen, Lotte Ansgaard

AU - Wiglesworth, Graig

AU - Xella, Stefania

PY - 2015/10/1

Y1 - 2015/10/1

N2 - An analysis is presented of events containing jets including at least one b-tagged jet, sizeable missing transverse momentum, and at least two leptons including a pair of the same electric charge, with the scalar sum of the jet and lepton transverse momenta being large. A data sample with an integrated luminosity of 20.3 fb−1 of pp collisions at √s = 8 TeV recorded by the ATLAS detector at the Large Hadron Collider is used. Standard Model processes rarely produce these final states, but there are several models of physics beyond the Standard Model that predict an enhanced rate of production of such events; the ones considered here are production of vector-like quarks, enhanced four-top-quark production, pair production of chiral b′-quarks, and production of two positively charged top quarks. Eleven signal regions are defined; subsets of these regions are combined when searching for each class of models. In the three signal regions primarily sensitive to positively charged top quark pair production, the data yield is consistent with the background expectation. There are more data events than expected from background in the set of eight signal regions defined for searching for vector-like quarks and chiral b′-quarks, but the significance of the discrepancy is less than two standard deviations. The discrepancy reaches 2.5 standard deviations in the set of five signal regions defined for searching for four-top-quark production. The results are used to set 95% CL limits on various models.

AB - An analysis is presented of events containing jets including at least one b-tagged jet, sizeable missing transverse momentum, and at least two leptons including a pair of the same electric charge, with the scalar sum of the jet and lepton transverse momenta being large. A data sample with an integrated luminosity of 20.3 fb−1 of pp collisions at √s = 8 TeV recorded by the ATLAS detector at the Large Hadron Collider is used. Standard Model processes rarely produce these final states, but there are several models of physics beyond the Standard Model that predict an enhanced rate of production of such events; the ones considered here are production of vector-like quarks, enhanced four-top-quark production, pair production of chiral b′-quarks, and production of two positively charged top quarks. Eleven signal regions are defined; subsets of these regions are combined when searching for each class of models. In the three signal regions primarily sensitive to positively charged top quark pair production, the data yield is consistent with the background expectation. There are more data events than expected from background in the set of eight signal regions defined for searching for vector-like quarks and chiral b′-quarks, but the significance of the discrepancy is less than two standard deviations. The discrepancy reaches 2.5 standard deviations in the set of five signal regions defined for searching for four-top-quark production. The results are used to set 95% CL limits on various models.

U2 - 10.1007/JHEP10(2015)150

DO - 10.1007/JHEP10(2015)150

M3 - Journal article

SN - 1126-6708

VL - 2015

JO - Journal of High Energy Physics (Online)

JF - Journal of High Energy Physics (Online)

IS - 10

M1 - 150

ER -

Analysis of events with b-jets and a pair of leptons of the same charge in pp collisions at √s = 8 TeV with the ATLAS detector

Abstract

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