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Title: Search for the standard model Higgs boson produced in association with top quarks and decaying into a b b ¯ pair in p p collisions at s = 13 TeV with the ATLAS detector

A search for the standard model Higgs boson produced in association with a top-quark pair, ttH, is presented. The analysis uses 36.1 fb-1 of pp collision data at s=13 TeV collected with the ATLAS detector at the Large Hadron Collider in 2015 and 2016. The search targets the H→bb decay mode. The selected events contain either one or two electrons or muons from the top-quark decays, and are then categorized according to the number of jets and how likely these are to contain b-hadrons. Multivariate techniques are used to discriminate between signal and background events, the latter being dominated by tt+jets production. For a Higgs boson mass of 125 GeV, the ratio of the measured ttH signal cross-section to the standard model expectation is found to be μ=0.84-0.61+0.64. A value of μ greater than 2.0 is excluded at 95% confidence level (C.L.) while the expected upper limit is μ<1.2 in the absence of a ttH signal.
Authors:
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Publication Date:
Grant/Contract Number:
AC02-05CH11231; AC02-76SF00515
Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 97; Journal Issue: 7; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1435386
Alternate Identifier(s):
OSTI ID: 1461980

Aaboud, M, Aad, G, Abbott, B, Abdinov, O, Abeloos, B, Abidi, SH, Abouzeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Adachi, S, Adamczyk, L, Adelman, J, Adersberger, M, Adye, T, Affolder, AA, Afik, Y, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahlen, SP, Ahmadov, F, Aielli, G, Akatsuka, S, Åkesson, TPA, Akilli, E, Akimov, AV, Alberghi, GL, Albert, J, Albicocco, P, Alconada Verzini, MJ, Alderweireldt, SC, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexander, G, Alexopoulos, T, Alhroob, M, Ali, B, Aliev, M, Alimonti, G, Alison, J, Alkire, SP, Allaire, C, Allbrooke, BMM, Allen, BW, Allport, PP, Aloisio, A, Alonso, A, Alonso, F, Alpigiani, C, Alshehri, AA, Alstaty, MI, Alvarez Gonzalez, B, Álvarez Piqueras, D, Alviggi, MG, Amadio, BT, Amaral Coutinho, Y, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Anastopoulos, C, Ancu, LS, Andari, N, Andeen, T, Anders, CF, Anders, JK, Anderson, KJ, Andreazza, A, Andrei, V, Angelidakis, S, Angelozzi, I, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Antonelli, M, Antonov, A, Antrim, DJ, Anulli, F, Aoki, M, Aperio Bella, L, Arabidze, G, and Arai, Y. Search for the standard model Higgs boson produced in association with top quarks and decaying into a bb¯ pair in pp collisions at s=13TeV with the ATLAS detector. United States: N. p., Web. doi:10.1103/PhysRevD.97.072016.
Aaboud, M, Aad, G, Abbott, B, Abdinov, O, Abeloos, B, Abidi, SH, Abouzeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Adachi, S, Adamczyk, L, Adelman, J, Adersberger, M, Adye, T, Affolder, AA, Afik, Y, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahlen, SP, Ahmadov, F, Aielli, G, Akatsuka, S, Åkesson, TPA, Akilli, E, Akimov, AV, Alberghi, GL, Albert, J, Albicocco, P, Alconada Verzini, MJ, Alderweireldt, SC, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexander, G, Alexopoulos, T, Alhroob, M, Ali, B, Aliev, M, Alimonti, G, Alison, J, Alkire, SP, Allaire, C, Allbrooke, BMM, Allen, BW, Allport, PP, Aloisio, A, Alonso, A, Alonso, F, Alpigiani, C, Alshehri, AA, Alstaty, MI, Alvarez Gonzalez, B, Álvarez Piqueras, D, Alviggi, MG, Amadio, BT, Amaral Coutinho, Y, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Anastopoulos, C, Ancu, LS, Andari, N, Andeen, T, Anders, CF, Anders, JK, Anderson, KJ, Andreazza, A, Andrei, V, Angelidakis, S, Angelozzi, I, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Antonelli, M, Antonov, A, Antrim, DJ, Anulli, F, Aoki, M, Aperio Bella, L, Arabidze, G, & Arai, Y. Search for the standard model Higgs boson produced in association with top quarks and decaying into a bb¯ pair in pp collisions at s=13TeV with the ATLAS detector. United States. doi:10.1103/PhysRevD.97.072016.
Aaboud, M, Aad, G, Abbott, B, Abdinov, O, Abeloos, B, Abidi, SH, Abouzeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Adachi, S, Adamczyk, L, Adelman, J, Adersberger, M, Adye, T, Affolder, AA, Afik, Y, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahlen, SP, Ahmadov, F, Aielli, G, Akatsuka, S, Åkesson, TPA, Akilli, E, Akimov, AV, Alberghi, GL, Albert, J, Albicocco, P, Alconada Verzini, MJ, Alderweireldt, SC, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexander, G, Alexopoulos, T, Alhroob, M, Ali, B, Aliev, M, Alimonti, G, Alison, J, Alkire, SP, Allaire, C, Allbrooke, BMM, Allen, BW, Allport, PP, Aloisio, A, Alonso, A, Alonso, F, Alpigiani, C, Alshehri, AA, Alstaty, MI, Alvarez Gonzalez, B, Álvarez Piqueras, D, Alviggi, MG, Amadio, BT, Amaral Coutinho, Y, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Anastopoulos, C, Ancu, LS, Andari, N, Andeen, T, Anders, CF, Anders, JK, Anderson, KJ, Andreazza, A, Andrei, V, Angelidakis, S, Angelozzi, I, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Antonelli, M, Antonov, A, Antrim, DJ, Anulli, F, Aoki, M, Aperio Bella, L, Arabidze, G, and Arai, Y. 2018. "Search for the standard model Higgs boson produced in association with top quarks and decaying into a bb¯ pair in pp collisions at s=13TeV with the ATLAS detector". United States. doi:10.1103/PhysRevD.97.072016.
@article{osti_1435386,
title = {Search for the standard model Higgs boson produced in association with top quarks and decaying into a bb¯ pair in pp collisions at s=13TeV with the ATLAS detector},
author = {Aaboud, M and Aad, G and Abbott, B and Abdinov, O and Abeloos, B and Abidi, SH and Abouzeid, OS and Abraham, NL and Abramowicz, H and Abreu, H and Abulaiti, Y and Acharya, BS and Adachi, S and Adamczyk, L and Adelman, J and Adersberger, M and Adye, T and Affolder, AA and Afik, Y and Agheorghiesei, C and Aguilar-Saavedra, JA and Ahlen, SP and Ahmadov, F and Aielli, G and Akatsuka, S and Åkesson, TPA and Akilli, E and Akimov, AV and Alberghi, GL and Albert, J and Albicocco, P and Alconada Verzini, MJ and Alderweireldt, SC and Aleksa, M and Aleksandrov, IN and Alexa, C and Alexander, G and Alexopoulos, T and Alhroob, M and Ali, B and Aliev, M and Alimonti, G and Alison, J and Alkire, SP and Allaire, C and Allbrooke, BMM and Allen, BW and Allport, PP and Aloisio, A and Alonso, A and Alonso, F and Alpigiani, C and Alshehri, AA and Alstaty, MI and Alvarez Gonzalez, B and Álvarez Piqueras, D and Alviggi, MG and Amadio, BT and Amaral Coutinho, Y and Ambroz, L and Amelung, C and Amidei, D and Amor Dos Santos, SP and Amoroso, S and Anastopoulos, C and Ancu, LS and Andari, N and Andeen, T and Anders, CF and Anders, JK and Anderson, KJ and Andreazza, A and Andrei, V and Angelidakis, S and Angelozzi, I and Angerami, A and Anisenkov, AV and Annovi, A and Antel, C and Antonelli, M and Antonov, A and Antrim, DJ and Anulli, F and Aoki, M and Aperio Bella, L and Arabidze, G and Arai, Y},
abstractNote = {A search for the standard model Higgs boson produced in association with a top-quark pair, ttH, is presented. The analysis uses 36.1 fb-1 of pp collision data at s=13 TeV collected with the ATLAS detector at the Large Hadron Collider in 2015 and 2016. The search targets the H→bb decay mode. The selected events contain either one or two electrons or muons from the top-quark decays, and are then categorized according to the number of jets and how likely these are to contain b-hadrons. Multivariate techniques are used to discriminate between signal and background events, the latter being dominated by tt+jets production. For a Higgs boson mass of 125 GeV, the ratio of the measured ttH signal cross-section to the standard model expectation is found to be μ=0.84-0.61+0.64. A value of μ greater than 2.0 is excluded at 95% confidence level (C.L.) while the expected upper limit is μ<1.2 in the absence of a ttH signal.},
doi = {10.1103/PhysRevD.97.072016},
journal = {Physical Review D},
number = 7,
volume = 97,
place = {United States},
year = {2018},
month = {4}
}