Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector
- M. Aaboud
- G. Aad
- B. Abbott
- O. Abdinov
- B. Abeloos
- D. K. Abhayasinghe
- S. H. Abidi
- O. S. AbouZeid
- N. L. Abraham
- H. Abramowicz
- H. Abreu
- Y. Abulaiti
- B. S. Acharya
- S. Adachi
- L. Adamczyk
- J. Adelman
- M. Adersberger
- A. Adiguzel
- T. Adye
- A. A. Affolder
- Y. Afik
- C. Agheorghiesei
- J. A. Aguilar–Saavedra
- F. Ahmadov
- G. Aielli
- S. Akatsuka
- T. P. A. Åkesson
- E. Akilli
- A. V. Akimov
- G. L. Alberghi
- Justin E Albert
- P. Albicocco
- M. J. Alconada Verzini
- S. Alderweireldt
- M. Aleksa
- I. N. Aleksandrov
- C. Alexa
- T. Alexopoulos
- M. Alhroob
- B. Ali
- Malik Aliev
- G. Alimonti
- John Alison
- S.P. Alkire
- C. Allaire
- B.M.M. Allbrooke
- B. W. Allen
- P. P. Allport
- A. Aloisio
- A. Alonso
- F. Alonso
- C. Alpigiani
- A. A. Alshehri
- Mahmoud I. Alstaty
- B. Álvarez González
- D. Álvarez Piqueras
- Mariagrazia Alviggi
- B.T. Amadio
- Y. Amaral Coutinho
- L. Ambroz
- Christoph Amelung
- D. Amidei
- S. P. Amor Dos Santos
- S. Amoroso
- C. S. Amrouche
- C. Anastopoulos
- L.S. Ancu
- N. Andari
- T. Andeen
- C. F. Anders
- J. K. Anders
- K. J. Anderson
- A. Andreazza
- V. Andrei
- C. R. Anelli
- S. Angelidakis
- I. Angelozzi
- Aaron Angerami
- A. V. Anisenkov
- A. Annovi
- C. Antel
- M. T. Anthony
- M. Antonelli
- D. J. A. Antrim
- F. Anulli
- M. Aoki
- L. Aperio Bella
- G. Arabidze
- J. P. Araque
- V. Araujo Ferraz
- Rodrigo Araujo Pereira
- A. T. H. Arce
- R.E. Ardell
- F.A. Arduh
- J-F. Arguin
- S. Argyropoulos
- Aaron James Armbruster
- L. J. Armitage
- A. Armstrong
- O. Arnaez
- EHElias Sideras Haddad
Physics Letters B · 2018 · Elsevier BV
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Abstract
The observation of Higgs boson production in association with a top quark pair ( t t ¯ H ), based on the analysis of proton–proton collision data at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider, is presented. Using data corresponding to integrated luminosities of up to 79.8 fb −1 , and considering Higgs boson decays into b b ¯ , W W ⁎ , τ + τ − , γγ , and Z Z ⁎ , the observed significance is 5.8 standard deviations, compared to an expectation of 4.9 standard deviations. Combined with the t t ¯ H searches using a dataset corresponding to integrated luminosities of 4.5 fb −1 at 7 TeV and 20.3 fb −1 at 8 TeV, the observed (expected) significance is 6.3 (5.1) standard deviations. Assuming Standard Model branching fractions, the total t t ¯ H production cross section at 13 TeV is measured to be 670 ± 90 (stat.) − 100 + 110 (syst.) fb, in agreement with the Standard Model prediction.