Search for exotic decays of the Higgs boson to a pair of pseudoscalars in the μμ b b and ττ b b final states
A search for exotic decays of the Higgs boson ( $$\text {H}$$ H ) with a mass of 125...
| Main Authors: | , , , , , , , , , , , , , , , , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
Springer Science and Business Media LLC
2024
|
| Online Access: | https://hdl.handle.net/1721.1/154999 |
| _version_ | 1824458039230464000 |
|---|---|
| author | Hayrapetyan, A. Tumasyan, A. Adam, W. Andrejkovic, J. W. Bergauer, T. Chatterjee, S. Damanakis, K. Dragicevic, M. Del Valle, A. E. Hussain, P. S. Jeitler, M. Krammer, N. Liko, D. Mikulec, I. Schieck, J. Schöfbeck, R. Schwarz, D. Sonawane, M. Templ, S. Waltenberger, W. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Hayrapetyan, A. Tumasyan, A. Adam, W. Andrejkovic, J. W. Bergauer, T. Chatterjee, S. Damanakis, K. Dragicevic, M. Del Valle, A. E. Hussain, P. S. Jeitler, M. Krammer, N. Liko, D. Mikulec, I. Schieck, J. Schöfbeck, R. Schwarz, D. Sonawane, M. Templ, S. Waltenberger, W. |
| author_sort | Hayrapetyan, A. |
| collection | MIT |
| description | A search for exotic decays of the Higgs boson (
$$\text {H}$$
H
) with a mass of 125
$$\,\text {Ge}\hspace{-.08em}\text {V}$$
Ge
V
to a pair of light pseudoscalars
$$\text {a}_{1} $$
a
1
is performed in final states where one pseudoscalar decays to two
$${\textrm{b}}$$
b
quarks and the other to a pair of muons or
$$\tau $$
τ
leptons. A data sample of proton–proton collisions at
$$\sqrt{s}=13\,\text {Te}\hspace{-.08em}\text {V} $$
s
=
13
Te
V
corresponding to an integrated luminosity of 138
$$\,\text {fb}^{-1}$$
fb
-
1
recorded with the CMS detector is analyzed. No statistically significant excess is observed over the standard model backgrounds. Upper limits are set at 95% confidence level (
$$\text {CL}$$
CL
) on the Higgs boson branching fraction to
$$\upmu \upmu \text{ b } \text{ b } $$
μ
μ
b
b
and to
$$\uptau \uptau \text{ b } \text{ b },$$
τ
τ
b
b
,
via a pair of
$$\text {a}_{1} $$
a
1
s. The limits depend on the pseudoscalar mass
$$m_{\text {a}_{1}}$$
m
a
1
and are observed to be in the range (0.17–3.3)
$$\times 10^{-4}$$
×
10
-
4
and (1.7–7.7)
$$\times 10^{-2}$$
×
10
-
2
in the
$$\upmu \upmu \text{ b } \text{ b } $$
μ
μ
b
b
and
$$\uptau \uptau \text{ b } \text{ b } $$
τ
τ
b
b
final states, respectively. In the framework of models with two Higgs doublets and a complex scalar singlet (2HDM+S), the results of the two final states are combined to determine upper limits on the branching fraction
$${\mathcal {B}}(\text {H} \rightarrow \text {a}_{1} \text {a}_{1} \rightarrow \ell \ell \text{ b } \text{ b})$$
B
(
H
→
a
1
a
1
→
ℓ
ℓ
b
b
)
at 95%
$$\text {CL}$$
CL
, with
$$\ell $$
ℓ
being a muon or a
$$\uptau $$
τ
lepton. For different types of 2HDM+S, upper bounds on the branching fraction
$${\mathcal {B}}(\text {H} \rightarrow \text {a}_{1} \text {a}_{1} )$$
B
(
H
→
a
1
a
1
)
are extracted from the combination of the two channels. In most of the Type II 2HDM+S parameter space,
$${\mathcal {B}}(\text {H} \rightarrow \text {a}_{1} \text {a}_{1} )$$
B
(
H
→
a
1
a
1
)
values above 0.23 are excluded at 95%
$$\text {CL}$$
CL
for
$$m_{\text {a}_{1}}$$
m
a
1
values between 15 and 60
$$\,\text {Ge}\hspace{-.08em}\text {V}$$
Ge
V
. |
| first_indexed | 2024-09-23T10:56:41Z |
| format | Article |
| id | mit-1721.1/154999 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2025-02-19T04:19:33Z |
| publishDate | 2024 |
| publisher | Springer Science and Business Media LLC |
| record_format | dspace |
| spelling | mit-1721.1/1549992025-02-04T02:19:40Z Search for exotic decays of the Higgs boson to a pair of pseudoscalars in the μμ b b and ττ b b final states Hayrapetyan, A. Tumasyan, A. Adam, W. Andrejkovic, J. W. Bergauer, T. Chatterjee, S. Damanakis, K. Dragicevic, M. Del Valle, A. E. Hussain, P. S. Jeitler, M. Krammer, N. Liko, D. Mikulec, I. Schieck, J. Schöfbeck, R. Schwarz, D. Sonawane, M. Templ, S. Waltenberger, W. Massachusetts Institute of Technology. Department of Physics A search for exotic decays of the Higgs boson ( $$\text {H}$$ H ) with a mass of 125 $$\,\text {Ge}\hspace{-.08em}\text {V}$$ Ge V to a pair of light pseudoscalars $$\text {a}_{1} $$ a 1 is performed in final states where one pseudoscalar decays to two $${\textrm{b}}$$ b quarks and the other to a pair of muons or $$\tau $$ τ leptons. A data sample of proton–proton collisions at $$\sqrt{s}=13\,\text {Te}\hspace{-.08em}\text {V} $$ s = 13 Te V corresponding to an integrated luminosity of 138 $$\,\text {fb}^{-1}$$ fb - 1 recorded with the CMS detector is analyzed. No statistically significant excess is observed over the standard model backgrounds. Upper limits are set at 95% confidence level ( $$\text {CL}$$ CL ) on the Higgs boson branching fraction to $$\upmu \upmu \text{ b } \text{ b } $$ μ μ b b and to $$\uptau \uptau \text{ b } \text{ b },$$ τ τ b b , via a pair of $$\text {a}_{1} $$ a 1 s. The limits depend on the pseudoscalar mass $$m_{\text {a}_{1}}$$ m a 1 and are observed to be in the range (0.17–3.3) $$\times 10^{-4}$$ × 10 - 4 and (1.7–7.7) $$\times 10^{-2}$$ × 10 - 2 in the $$\upmu \upmu \text{ b } \text{ b } $$ μ μ b b and $$\uptau \uptau \text{ b } \text{ b } $$ τ τ b b final states, respectively. In the framework of models with two Higgs doublets and a complex scalar singlet (2HDM+S), the results of the two final states are combined to determine upper limits on the branching fraction $${\mathcal {B}}(\text {H} \rightarrow \text {a}_{1} \text {a}_{1} \rightarrow \ell \ell \text{ b } \text{ b})$$ B ( H → a 1 a 1 → ℓ ℓ b b ) at 95% $$\text {CL}$$ CL , with $$\ell $$ ℓ being a muon or a $$\uptau $$ τ lepton. For different types of 2HDM+S, upper bounds on the branching fraction $${\mathcal {B}}(\text {H} \rightarrow \text {a}_{1} \text {a}_{1} )$$ B ( H → a 1 a 1 ) are extracted from the combination of the two channels. In most of the Type II 2HDM+S parameter space, $${\mathcal {B}}(\text {H} \rightarrow \text {a}_{1} \text {a}_{1} )$$ B ( H → a 1 a 1 ) values above 0.23 are excluded at 95% $$\text {CL}$$ CL for $$m_{\text {a}_{1}}$$ m a 1 values between 15 and 60 $$\,\text {Ge}\hspace{-.08em}\text {V}$$ Ge V . 2024-05-20T14:49:23Z 2024-05-20T14:49:23Z 2024-05-14 2024-05-19T03:13:00Z Article http://purl.org/eprint/type/JournalArticle 1434-6052 https://hdl.handle.net/1721.1/154999 CMS Collaboration., Hayrapetyan, A., Tumasyan, A. et al. Search for exotic decays of the Higgs boson to a pair of pseudoscalars in the μμ b b and ττ b b final states. Eur. Phys. J. C 84, 493 (2024). PUBLISHER_CC en 10.1140/epjc/s10052-024-12727-4 The European Physical Journal C Creative Commons Attribution https://creativecommons.org/licenses/by/4.0/ The Author(s) application/pdf Springer Science and Business Media LLC Springer Berlin Heidelberg |
| spellingShingle | Hayrapetyan, A. Tumasyan, A. Adam, W. Andrejkovic, J. W. Bergauer, T. Chatterjee, S. Damanakis, K. Dragicevic, M. Del Valle, A. E. Hussain, P. S. Jeitler, M. Krammer, N. Liko, D. Mikulec, I. Schieck, J. Schöfbeck, R. Schwarz, D. Sonawane, M. Templ, S. Waltenberger, W. Search for exotic decays of the Higgs boson to a pair of pseudoscalars in the μμ b b and ττ b b final states |
| title | Search for exotic decays of the Higgs boson to a pair of pseudoscalars in the μμ b b and ττ b b final states |
| title_full | Search for exotic decays of the Higgs boson to a pair of pseudoscalars in the μμ b b and ττ b b final states |
| title_fullStr | Search for exotic decays of the Higgs boson to a pair of pseudoscalars in the μμ b b and ττ b b final states |
| title_full_unstemmed | Search for exotic decays of the Higgs boson to a pair of pseudoscalars in the μμ b b and ττ b b final states |
| title_short | Search for exotic decays of the Higgs boson to a pair of pseudoscalars in the μμ b b and ττ b b final states |
| title_sort | search for exotic decays of the higgs boson to a pair of pseudoscalars in the μμ b b and ττ b b final states |
| url | https://hdl.handle.net/1721.1/154999 |
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