TY - JOUR

T1 - Search for resonant and non-resonant Higgs boson pair production in the ${b\bar{b}\tau^+\tau^-}$ decay channel in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector

AU - The ATLAS collaboration

AU - Barton, Adam Edward

AU - Bertram, Iain Alexander

AU - Borissov, Guennadi

AU - Bouhova-Thacker, Evelina Vassileva

AU - Fox, Harald

AU - Henderson, Robert Charles William

AU - Jones, Roger William Lewis

AU - Kartvelishvili, Vakhtang

AU - Long, Robin Eamonn

AU - Love, Peter Allan

AU - Muenstermann, Daniel Matthias Alfred

AU - Parker, Adam Jackson

AU - Ristić, B.

AU - Smizanska, Maria

AU - Tee, Amy

AU - Walder, James William

AU - Wharton, Andrew Mark

AU - Whitmore, Ben

PY - 2018/11/9

Y1 - 2018/11/9

N2 - A search for resonant and non-resonant pair production of Higgs bosons in the$b\bar{b}\tau^+\tau^-$ final state is presented. The search uses 36.1 fb$^{-1}$ of $pp$ collision data with $\sqrt{s}$ = 13 TeV recorded by the ATLAS experiment at the LHC in 2015 and 2016. Decays of the $\tau$-lepton pairs with at least one $\tau$-lepton decaying to final states with hadrons and a neutrino are considered. No significant excess above the expected background is observed in the data. The cross-section times branching ratio for non-resonant Higgs boson pair production is constrained to be less than 30.9 fb, 12.7 times the Standard Model expectation, at 95% confidence level. The data are also analyzed to probe resonant Higgs boson pair production, constraining a model with an extended Higgs sector based on two doublets and a Randall--Sundrum bulk graviton model. Upper limits are placed on the resonant Higgs boson pair production cross-section times branching ratio, excluding resonances $X$ in the mass range 305 GeV < $m_X$ < 402 GeV in the simplified hMSSM minimal supersymmetric model for $\tan\beta=2$ and excluding bulk Randall--Sundrum gravitons $G_{KK}$ in the mass range 325 GeV < $m_{G_{KK}}$ < 885 GeV for $k/\overline{M}_{Pl} = 1$.

AB - A search for resonant and non-resonant pair production of Higgs bosons in the$b\bar{b}\tau^+\tau^-$ final state is presented. The search uses 36.1 fb$^{-1}$ of $pp$ collision data with $\sqrt{s}$ = 13 TeV recorded by the ATLAS experiment at the LHC in 2015 and 2016. Decays of the $\tau$-lepton pairs with at least one $\tau$-lepton decaying to final states with hadrons and a neutrino are considered. No significant excess above the expected background is observed in the data. The cross-section times branching ratio for non-resonant Higgs boson pair production is constrained to be less than 30.9 fb, 12.7 times the Standard Model expectation, at 95% confidence level. The data are also analyzed to probe resonant Higgs boson pair production, constraining a model with an extended Higgs sector based on two doublets and a Randall--Sundrum bulk graviton model. Upper limits are placed on the resonant Higgs boson pair production cross-section times branching ratio, excluding resonances $X$ in the mass range 305 GeV < $m_X$ < 402 GeV in the simplified hMSSM minimal supersymmetric model for $\tan\beta=2$ and excluding bulk Randall--Sundrum gravitons $G_{KK}$ in the mass range 325 GeV < $m_{G_{KK}}$ < 885 GeV for $k/\overline{M}_{Pl} = 1$.

KW - Higgs bosons

KW - Spontaneous symmetry breaking

KW - Hypothetical scalars

KW - Extension of Higgs sector

U2 - 10.1103/PhysRevLett.121.191801

DO - 10.1103/PhysRevLett.121.191801

M3 - Journal article

VL - 121

JO - Physical review letters

JF - Physical review letters

SN - 1079-7114

IS - 19

M1 - 191801

ER -