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Search for a low-mass $\tau^+\tau^-$ resonance in association with a bottom quark in proton-proton collisions at $\sqrt{s}=$ 13 TeV

The collaboration
No Journal Information, 2019

Abstract (data abstract)
A general search is presented for a low-mass $\tau^+\tau^-$ resonance produced in association with a bottom quark. The search is based on proton-proton collision data at a center-of-mass energy of $13~\mathrm{TeV}$ collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of $35.9~\mathrm{fb}^{-1}$. The observed data are consistent with the standard model expectation. Upper limits at $95\%$ confidence level on the cross section times branching fraction are determined for two hypothetical signal models: a light pseudoscalar Higgs boson decaying to a pair of $\tau$ leptons produced in association with bottom quarks, and a low-mass boson X decaying to a $\tau$ lepton pair that is produced in the decay of a bottom-like quark B such that $\mathrm{B}\to \mathrm{bX}$. Masses between $25$ and $70~\mathrm{GeV}$ are probed for the light pseudoscalar boson with upper limits ranging from $250$ to $44~\mathrm{pb}$. Upper limits from $20$ to $0.3~\mathrm{pb}$ are set on B masses between $170$ and $450~\mathrm{GeV}$ for X boson masses between $20$ to $70~\mathrm{GeV}$. Through event selections that are optimized for vector-like quarks, the search results extend the reach for new particles to a previously unexplored phase space.

• #### Acceptance of the bbA signal in the 1 b tag category

Supplementary material

10.17182/hepdata.88348.v1/t1

The product of acceptance, efficiency, and branching fraction of $\mathrm{b}\overline{\mathrm{b}}\mathrm{A}$ production with $\mathrm{A} \rightarrow \tau\tau$ in the $\mathrm{e}\tau_\mathrm{h}$ and $\mu\tau_\mathrm{h}$...

• #### Event yields in the etau channel of the 1 b tag category

Data from Figure 2 (left)

10.17182/hepdata.88348.v1/t2

Observed $m_{\tau\tau}$ distribution in the $\mathrm{e}\tau_\mathrm{h}$ channel of the 1 b tag category, compared to the expected SM background contributions....

• #### Event yields in the mutau channel of the 1 b tag category

Data from Figure 2 (right)

10.17182/hepdata.88348.v1/t3

Observed $m_{\tau\tau}$ distribution in the $\mu\tau_\mathrm{h}$ channel of the 1 b tag category, compared to the expected SM background contributions....

• #### Exclusion limits on bbA, combined

Data from Figure 4

10.17182/hepdata.88348.v1/t4

Observed (black solid) and expected (black dotted) limits at 95% confidence level on the product of the the cross section...

• #### Exclusion limits on bbA, etau, 1 b tag category

Supplementary material

10.17182/hepdata.88348.v1/t5

Observed (black solid) and expected (black dotted) limits at 95% confidence level on the product of the the cross section...

• #### Exclusion limits on bbA, mutau, 1 b tag category

Supplementary material

10.17182/hepdata.88348.v1/t6

Observed (black solid) and expected (black dotted) limits at 95% confidence level on the product of the the cross section...

• #### Acceptance of the qbX signal in 1b1f and 1b1c

Supplementary material

10.17182/hepdata.88348.v1/t7

The product of acceptance, efficiency, and branching fraction of the qbX signal with $\mathrm{X} \rightarrow \tau\tau$ and $m_{\mathrm{B}}=170~\mathrm{GeV}$ in $\mathrm{e}\tau_\mathrm{h}$...

• #### Event yields in the 1b1f, etau category

Data from Figure 3 (top left)

10.17182/hepdata.88348.v1/t8

Observed $m_{\tau\tau}$ distribution in the $\mathrm{e}\tau_\mathrm{h}$ channel of the 1b1f category, compared to the expected SM background contributions. The distributions...

• #### Event yields in the 1b1c, etau category

Data from Figure 3 (top right)

10.17182/hepdata.88348.v1/t9

Observed $m_{\tau\tau}$ distribution in the $\mathrm{e}\tau_\mathrm{h}$ channel of the 1b1c category, compared to the expected SM background contributions. The distributions...

• #### Event yields in the 1b1f, mutau category

Data from Figure 3 (bottom left)

10.17182/hepdata.88348.v1/t10

Observed $m_{\tau\tau}$ distribution in the $\mu\tau_\mathrm{h}$ channel of the 1b1f category, compared to the expected SM background contributions. The distributions...

• #### Event yields in the 1b1c, mutau category

Data from Figure 3 (bottom right)

10.17182/hepdata.88348.v1/t11

Observed $m_{\tau\tau}$ distribution in the $\mu\tau_\mathrm{h}$ channel of the 1b1c category, compared to the expected SM background contributions. The distributions...

• #### Exclusion limits on qbX, mB = 170 GeV, combined

Data from Figure 5 (top left)

10.17182/hepdata.88348.v1/t12

Observed (black solid) and expected (black dotted) limits at 95% confidence level on the product of the the cross section...

• #### Exclusion limits on qbX, mB = 300 GeV, combined

Data from Figure 5 (top right)

10.17182/hepdata.88348.v1/t13

Observed (black solid) and expected (black dotted) limits at 95% confidence level on the product of the the cross section...

• #### Exclusion limits on qbX, mB = 450 GeV, combined

Data from Figure 5 (bottom)

10.17182/hepdata.88348.v1/t14

Observed (black solid) and expected (black dotted) limits at 95% confidence level on the product of the the cross section...

• #### Exclusion limits on qbX, mB = 170 GeV, etau, 1b1f category

Supplementary material

10.17182/hepdata.88348.v1/t15

Observed (black solid) and expected (black dotted) limits at 95% confidence level on the product of the the cross section...

• #### Exclusion limits on qbX, mB = 170 GeV, etau, 1b1c category

Supplementary material

10.17182/hepdata.88348.v1/t16

Observed (black solid) and expected (black dotted) limits at 95% confidence level on the product of the the cross section...

• #### Exclusion limits on qbX, mB = 170 GeV, mutau, 1b1f category

Supplementary material

10.17182/hepdata.88348.v1/t17

Observed (black solid) and expected (black dotted) limits at 95% confidence level on the product of the the cross section...

• #### Exclusion limits on qbX, mB = 170 GeV, mutau, 1b1c category

Supplementary material

10.17182/hepdata.88348.v1/t18

Observed (black solid) and expected (black dotted) limits at 95% confidence level on the product of the the cross section...