OTHER ${{\mathit H}^{0}}$ PRODUCTION PROPERTIES

${{\mathit H}^{0}}{{\mathit H}^{0}}$ Production

INSPIRE  
The 95$\%$ CL limits are for the cross section (CS) and Higgs self coupling (${{\mathit \kappa}_{{\lambda}}}$ ) scaling factors both relative to the SM predictions.
CS ${{\mathit \kappa}_{{\lambda}}}$ CL% DOCUMENT ID TECN  COMMENT
• • We do not use the following data for averages, fits, limits, etc. • •
$ <7.7 $ $-3.3$ to 8.5 95 1
SIRUNYAN
2021K
 CMS 13 TeV, ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit b}}{{\overline{\mathit b}}}$
$ <6.9 $ $-5.0$ to 12.0 95 2
AAD
2020C
 ATLS 13 TeV, ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \gamma}}{{\mathit \gamma}}$ , ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \tau}}{{\mathit \tau}}$ , ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$ , ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit W}}{{\mathit W}^{*}}$ , ${{\mathit W}}{{\mathit W}^{*}}{{\mathit \gamma}}{{\mathit \gamma}}$ , ${{\mathit W}}{{\mathit W}^{*}}{{\mathit W}}{{\mathit W}^{*}}$
$<40$ 95 3
AAD
2020E
 ATLS 13 TeV, ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \ell}}{{\mathit \nu}}{{\mathit \ell}}{{\mathit \nu}}$
$<840$ 95 4
AAD
2020X
 ATLS 13 TeV, VBF, ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$
$<12.9$ 95 5
AABOUD
2019A
 ATLS 13 TeV, ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$
$<300$ 95 6
AABOUD
2019O
 ATLS 13 TeV, ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit W}}{{\mathit W}^{*}}$
$<160$ 95 7
AABOUD
2019T
 ATLS 13 TeV, ${{\mathit W}}{{\mathit W}^{*}}{{\mathit W}}{{\mathit W}^{*}}$
$ <24 $ $-11$ to 17 95 8
SIRUNYAN
2019
CMS 13 TeV, ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit b}}{{\overline{\mathit b}}}$
$<75$ 95 9
SIRUNYAN
2019AB
 CMS 13 TeV, ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$
$ <22.2 $ $-11.8$ to 18.8 95 10
SIRUNYAN
2019BE
 CMS 13 TeV, ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \gamma}}{{\mathit \gamma}}$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \tau}}{{\mathit \tau}}$ , ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$ , ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit W}}{{\mathit W}^{*}}$ , ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit Z}}{{\mathit Z}^{*}}$
$<179$ 95 11
SIRUNYAN
2019H
 CMS 13 TeV, ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$
$<230$ 95 12
AABOUD
2018BU
 ATLS 13 TeV, ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit W}}{{\mathit W}^{*}}$
$<12.7$ 95 13
AABOUD
2018CQ
 ATLS 13 TeV, ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \tau}}{{\mathit \tau}}$
$ <22 $ $-8.2$ to 13.2 95 14
AABOUD
2018CW
 ATLS 13 TeV, ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit b}}{{\overline{\mathit b}}}$
$<30$ 95 15
SIRUNYAN
2018A
 CMS 13 TeV, ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \tau}}{{\mathit \tau}}$
$<79$ 95 16
SIRUNYAN
2018F
 CMS 13 TeV, ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \ell}}{{\mathit \nu}}{{\mathit \ell}}{{\mathit \nu}}$
$<43$ 95 17
SIRUNYAN
2017CN
 CMS 8 TeV, ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \tau}}{{\mathit \tau}}$ , ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit b}}{{\overline{\mathit b}}}$ , ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$
$<108$ 95 18
AABOUD
2016I
 ATLS 13 TeV, ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$
$<74$ 95 19
KHACHATRYAN
2016BQ
 CMS 8 TeV, ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit b}}{{\overline{\mathit b}}}$
$<70$ 95 20
AAD
2015CE
 ATLS 8 TeV, ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$ , ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \tau}}{{\mathit \tau}}$ , ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit b}}{{\overline{\mathit b}}}$ , ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit W}}{{\mathit W}}$
1  SIRUNYAN 2021K search for non-resonant ${{\mathit H}^{0}}{{\mathit H}^{0}}$ production using ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit b}}{{\overline{\mathit b}}}$ with data of 137 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. The upper limit on the ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit b}}{{\overline{\mathit b}}}$ production cross section at 95$\%$ CL is measured to be 0.67 fb, which corresponds to about 7.7 times the SM prediction. The quartic coupling ( ${{\mathit V}}{{\mathit V}}{{\mathit H}^{0}}{{\mathit H}^{0}}$ , ${{\mathit V}}$ = ${{\mathit W}}$ ,${{\mathit Z}}$ ) scaling factor ${{\mathit \kappa}_{{2V}}}$ (= ${{\mathit c}_{{2V}}}$ ) is measured to be $-1.3$ $<$ ${{\mathit \kappa}_{{2V}}}$ $<$ 3.5 at 95$\%$ CL.
2  AAD 2020C combine results of up to 36.1 fb${}^{-1}$ data at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV for ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \gamma}}{{\mathit \gamma}}$ , ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \tau}}{{\mathit \tau}}$ , ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$ , ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit W}}{{\mathit W}^{*}}$ , ${{\mathit W}}{{\mathit W}^{*}}{{\mathit \gamma}}{{\mathit \gamma}}$ , ${{\mathit W}}{{\mathit W}^{*}}{{\mathit W}}{{\mathit W}^{*}}$ (AABOUD 2018CW, AABOUD 2018CQ, AABOUD 2019A, AABOUD 2019O, AABOUD 2018BU, and AABOUD 2019T).
3  AAD 2020E search non-resonant for ${{\mathit H}^{0}}{{\mathit H}^{0}}$ production using ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \ell}}{{\mathit \nu}}{{\mathit \ell}}{{\mathit \nu}}$ , where one of the Higgs bosons decays to ${{\mathit b}}{{\overline{\mathit b}}}$ and the other decays to either ${{\mathit W}}{{\mathit W}^{*}}$ , ${{\mathit Z}}{{\mathit Z}^{*}}$ , or ${{\mathit \tau}}{{\mathit \tau}}$ , with data of 139 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. The upper limit on the ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$ production cross section at 95$\%$ CL is measured to be 1.2 pb, which corresponds to about 40 times the SM prediction.
4  AAD 2020X search for ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$ process via VBF with data of 126 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. The upper limit on the SM non-resonant ${{\mathit H}}{{\mathit H}}$ production cross section is 1460 fb at 95$\%$ CL, which corresponds to 840 times the SM prediction. The quartic coupling ( ${{\mathit V}}{{\mathit V}}{{\mathit H}^{0}}{{\mathit H}^{0}}$ , ${{\mathit V}}$ = ${{\mathit W}}$ ,${{\mathit Z}}$ ) scaling factor ${{\mathit \kappa}_{{2V}}}$ is excluded in the region of ${{\mathit \kappa}_{{2V}}}$ $<$ $-0.43$ or ${{\mathit \kappa}_{{2V}}}$ $>$ $2.56$ at 95$\%$ CL.
5  AABOUD 2019A search for ${{\mathit H}^{0}}{{\mathit H}^{0}}$ production using ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$ with data of 36.1 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. The upper limit on the ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$ production cross section at 95$\%$ is measured to be 147 fb, which corresponds to about 12.9 times the SM prediction.
6  AABOUD 2019O search for ${{\mathit H}^{0}}{{\mathit H}^{0}}$ production using ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit W}}{{\mathit W}^{*}}$ with data of 36.1 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. The upper limit on the ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$ production cross section at 95$\%$ CL is calculated to be 10 pb from the observed upper limit on the ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit W}}{{\mathit W}^{*}}$ production cross section of 2.5 pb assuming the SM branching fractions. The former corresponds to about 300 times the SM prediction.
7  AABOUD 2019T search for ${{\mathit H}^{0}}{{\mathit H}^{0}}$ production using ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit W}}{{\mathit W}^{*}}{{\mathit W}}{{\mathit W}^{*}}$ with data of 36.1 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. The upper limit on the ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$ production cross section at 95$\%$ is measured to be 5.3 pb, which corresponds to about 160 times the SM prediction.
8  SIRUNYAN 2019 search for ${{\mathit H}^{0}}{{\mathit H}^{0}}$ production using ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit b}}{{\overline{\mathit b}}}$ with data of 35.9 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. The upper limit on the ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit b}}{{\overline{\mathit b}}}$ production cross section at 95$\%$ CL is measured to be 2.0 fb, which corresponds to about 24 times the SM prediction. The effective Higgs boson self-coupling $\kappa _{\lambda }$ ( = $\lambda _{ {{\mathit H}} {{\mathit H}} {{\mathit H}} }$ $/$ $\lambda {}^{SM}_{ {{\mathit H}} {{\mathit H}} {{\mathit H}} }$) is constrainted to be $-11$ $<$ $\kappa _{\lambda }$ $<$ $17$ at 95$\%$ CL assuming all other Higgs boson couplings are at their SM value.
9  SIRUNYAN 2019AB search for ${{\mathit H}^{0}}{{\mathit H}^{0}}$ production using ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$ , where 4 heavy flavor jets from two Higgs bosons are resolved, with data of 35.9 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. The upper limit on the ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$ production cross section at 95$\%$ is measured to be 847 fb, which corresponds to about 75 times the SM prediction.
10  SIRUNYAN 2019BE combine results of 13 TeV 35.9 fb${}^{-1}$ data: SIRUNYAN 2019 , SIRUNYAN 2018A, SIRUNYAN 2019AB, SIRUNYAN 2019H, and SIRUNYAN 2018F.
11  SIRUNYAN 2019H search for ${{\mathit H}^{0}}{{\mathit H}^{0}}$ production using ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$ , where one of ${{\mathit b}}{{\overline{\mathit b}}}$ pairs is highly boosted and the other one is resolved, with data of 35.9 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. The upper limit on the ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$ production cross section at 95$\%$ is measured to be 1980 fb, which corresponds to about 179 times the SM prediction.
12  AABOUD 2018BU search for ${{\mathit H}^{0}}{{\mathit H}^{0}}$ production using ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit W}}{{\mathit W}^{*}}$ with the final state of ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \ell}}{{\mathit \nu}}{{\mathit j}}{{\mathit j}}$ using data of 36.1 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. The upper limit on the ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$ production cross section at 95$\%$ CL is measured to be 7.7 pb, which corresponds to about 230 times the SM prediction. The upper limit on the ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit W}}{{\mathit W}^{*}}$ at 95$\%$ CL is measured to be 7.5 fb (see thier Table 6).
13  AABOUD 2018CQ search for ${{\mathit H}^{0}}{{\mathit H}^{0}}$ production using ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \tau}}{{\mathit \tau}}$ with data of 36.1 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. The upper limit on the ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \tau}}{{\mathit \tau}}$ production cross section at 95$\%$ is measured to be 30.9 fb, which corresponds to about 12.7 times the SM prediction.
14  AABOUD 2018CW search for ${{\mathit H}^{0}}{{\mathit H}^{0}}$ production using ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit b}}{{\overline{\mathit b}}}$ with data of 36.1 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. The upper limit on the ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$ production cross section at 95$\%$ is measured to be 0.73 pb, which corresponds to about 22 times the SM prediction. The effective Higgs boson self-coupling $\kappa _{\lambda }$ is constrained to be $-8.2$ $<$ $\kappa _{\lambda }$ $<$ $13.2$ at 95$\%$ CL assuming all other Higgs boson couplings are at their SM value.
15  SIRUNYAN 2018A search for ${{\mathit H}^{0}}{{\mathit H}^{0}}$ production using ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \tau}}{{\mathit \tau}}$ with data of 35.9 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. The upper limit on the ${{\mathit g}}$ ${{\mathit g}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \tau}}{{\mathit \tau}}$ production cross section is measured to be 75.4 fb, which corresponds to about 30 times the SM prediction. Limits on Higgs-boson trilinear coupling ${{\mathit \lambda}_{{HHH}}}$ and top Yukawa coupling ${{\mathit y}_{{t}}}$ are also given (see their Fig. 6).
16  SIRUNYAN 2018F search non-resonant for ${{\mathit H}^{0}}{{\mathit H}^{0}}$ production using ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \ell}}{{\mathit \nu}}{{\mathit \ell}}{{\mathit \nu}}$ , where ${{\mathit \ell}}{{\mathit \nu}}{{\mathit \ell}}{{\mathit \nu}}$ is either ${{\mathit W}}$ ${{\mathit W}}$ $\rightarrow$ ${{\mathit \ell}}{{\mathit \nu}}{{\mathit \ell}}{{\mathit \nu}}$ or ${{\mathit Z}}$ ${{\mathit Z}}$ $\rightarrow$ ${{\mathit \ell}}{{\mathit \ell}}{{\mathit \nu}}{{\mathit \nu}}$ (${{\mathit \ell}}$ is ${{\mathit e}}$ , ${{\mathit \mu}}$ or a leptonically decaying ${{\mathit \tau}}$ ), with data of 35.9 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. The upper limit on the ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \ell}}{{\mathit \nu}}{{\mathit \ell}}{{\mathit \nu}}$ production cross section at 95$\%$ CL is measured to be 72 fb, which corresponds to about 79 times the SM prediction.
17  SIRUNYAN 2017CN search for ${{\mathit H}^{0}}{{\mathit H}^{0}}$ production using ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \tau}}{{\mathit \tau}}$ with data of 18.3 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. Results are then combined with the published results of the ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit b}}{{\overline{\mathit b}}}$ and ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$ , which use data of up to 19.7 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. The upper limit on the ${{\mathit g}}$ ${{\mathit g}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$ production cross section is measured to be 0.59 pb from ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \tau}}{{\mathit \tau}}$ , which corresponds to about 59 times the SM prediction (gluon fusion). The combined upper limit is 0.43 pb, which is about 43 times the SM prediction. The quoted values are given for ${\mathit m}_{{{\mathit H}^{0}}}$ = 125 GeV.
18  AABOUD 2016I search for ${{\mathit H}^{0}}{{\mathit H}^{0}}$ production using ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$ with data of 3.2 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. The upper limit on the ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$ production cross section is measured to be 1.22 pb. This result corresponds to about 108 times the SM prediction (gluon fusion), which is $11.3$ ${}^{+0.9}_{-1.0}$ fb (NNLO+NNLL) including top quark mass effects. The quoted values are given for ${\mathit m}_{{{\mathit H}^{0}}}$ = 125 GeV .
19  KHACHATRYAN 2016BQ search for ${{\mathit H}^{0}}{{\mathit H}^{0}}$ production using ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit b}}{{\overline{\mathit b}}}$ with data of 19.7 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. The upper limit on the ${{\mathit g}}$ ${{\mathit g}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit b}}{{\overline{\mathit b}}}$ production is measured to be 1.85 fb, which corresponds to about 74 times the SM prediction and is translated into 0.71 pb for ${{\mathit g}}$ ${{\mathit g}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$ production cross section. Limits on Higgs-boson trilinear coupling $\lambda $ are also given.
20  AAD 2015CE search for ${{\mathit H}^{0}}{{\mathit H}^{0}}$ production using ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \tau}}{{\mathit \tau}}$ and ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit W}}{{\mathit W}}$ with data of 20.3 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. These results are then combined with the published results of the ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit b}}{{\overline{\mathit b}}}$ and ${{\mathit H}^{0}}$ ${{\mathit H}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$ , which use data of up to 20.3 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 8 TeV. The upper limits on the ${{\mathit g}}$ ${{\mathit g}}$ $\rightarrow$ ${{\mathit H}^{0}}{{\mathit H}^{0}}$ production cross section are measured to be 1.6 pb, 11.4 pb, 2.2 pb and 0.62 pb from ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit \tau}}{{\mathit \tau}}$ , ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit W}}{{\mathit W}}$ , ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit b}}{{\overline{\mathit b}}}$ and ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$ , respectively. The combined upper limit is 0.69 pb, which corresponds to about 70 times the SM prediction. The quoted results are given for ${\mathit m}_{{{\mathit H}^{0}}}$ = 125.4 GeV. See their Table 4.
References:
SIRUNYAN 2021K
JHEP 2103 257 Search for nonresonant Higgs boson pair production in final states with two bottom quarks and two photons in proton-proton collisions at $ \sqrt{s} $ = 13 TeV
AAD 2020X
JHEP 2007 108 Search for the $HH \rightarrow b \bar{b} b \bar{b}$ process via vector-boson fusion production using proton-proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector
Also
JHEP 2101 145 (errat.) Search for the $HH \rightarrow b \bar{b} b \bar{b}$ process via vector-boson fusion production using proton-proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector
Also
JHEP 2105 207 (errat.) Search for the $HH \rightarrow b \bar{b} b \bar{b}$ process via vector-boson fusion production using proton-proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector
AAD 2020E
PL B801 135145 Search for non-resonant Higgs boson pair production in the $bb\ell\nu\ell\nu$ final state with the ATLAS detector in $pp$ collisions at $\sqrt{s} = 13$ TeV
AAD 2020C
PL B800 135103 Combination of searches for Higgs boson pairs in $pp$ collisions at $\sqrt{s} = $13 TeV with the ATLAS detector
AABOUD 2019O
JHEP 1904 092 Search for Higgs boson pair production in the $b\bar{b}WW^{*}$ decay mode at $\sqrt{s}=13$ TeV with the ATLAS detector
AABOUD 2019A
JHEP 1901 030 Search for pair production of Higgs bosons in the $b\bar{b}b\bar{b}$ final state using proton-proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector
AABOUD 2019T
JHEP 1905 124 Search for Higgs boson pair production in the $WW^{(*)}WW^{(*)}$ decay channel using ATLAS data recorded at $\sqrt{s}=13$ TeV
SIRUNYAN 2019AB
JHEP 1904 112 Search for nonresonant Higgs boson pair production in the $\mathrm{b\overline{b}b\overline{b}}$ final state at $\sqrt{s} =$ 13 TeV
SIRUNYAN 2019
PL B788 7 Search for Higgs boson pair production in the $\gamma\gamma\mathrm{b\overline{b}}$ final state in pp collisions at $\sqrt{s}=$ 13 TeV
SIRUNYAN 2019H
JHEP 1901 040 Search for production of Higgs boson pairs in the four b quark final state using large-area jets in proton-proton collisions at $\sqrt{s}=$ 13 TeV
SIRUNYAN 2019BE
PRL 122 121803 Combination of searches for Higgs boson pair production in proton-proton collisions at $\sqrt{s} = $ 13 TeV
AABOUD 2018CW
JHEP 1811 040 Search for Higgs boson pair production in the $\gamma\gamma b\bar{b}$ final state with 13 TeV $pp$ collision data collected by the ATLAS experiment
AABOUD 2018BU
EPJ C78 1007 Search for Higgs boson pair production in the $\gamma\gamma WW^{*}$ channel using $pp$ collision data recorded at $\sqrt{s} = 13$ TeV with the ATLAS detector
AABOUD 2018CQ
PRL 121 191801 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
SIRUNYAN 2018A
PL B778 101 Search for Higgs Boson Pair Production in Events with Two Bottom Quarks and Two Tau Leptons in Proton-Proton Collisions at $\sqrt {s }$ = 13 TeV
SIRUNYAN 2018F
JHEP 1801 054 Search for Resonant and Nonresonant Higgs Boson Pair Production in the ${\mathit {\mathit b}}{\mathit {\overline{\mathit b}}}{{\mathit \ell}}{{\mathit \nu}}{{\mathit \ell}}{{\mathit \nu}}$ Final State in Proton-Proton Collisions at $\sqrt {s }$ = 13 TeV
SIRUNYAN 2017CN
PR D96 072004 Search for Higgs Boson Pair Production in the ${\mathit {\mathit b}}{\mathit {\mathit b}}{{\mathit \tau}}{{\mathit \tau}}$ Final State in Proton-Proton Collisions at $\sqrt {s }$ = 8 TeV
AABOUD 2016I
PR D94 052002 Search for Pair Production of Higgs Bosons in the ${\mathit {\mathit b}}{\mathit {\overline{\mathit b}}}{\mathit {\mathit b}}{\mathit {\overline{\mathit b}}}$ Final State using Proton-Proton Collisions at $\sqrt {s }$ = 13 TeV with the ATLAS Detector
KHACHATRYAN 2016BQ
PR D94 052012 Search for Two Higgs Bosons in Final States Containing Two Photons and Two Bottom Quarks in Proton-Proton Collisions at 8 TeV
AAD 2015CE
PR D92 092004 Searches for Higgs Boson Pair Production in the ${{\mathit h}}$ ${{\mathit h}}$ $\rightarrow$ ${\mathit {\mathit b}}{\mathit {\mathit b}}{{\mathit \tau}}{{\mathit \tau}}$ , ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit W}}{{\mathit W}^{*}}$ , ${{\mathit \gamma}}{{\mathit \gamma}}{\mathit {\mathit b}}{\mathit {\mathit b}}$, ${\mathit {\mathit b}}{\mathit {\mathit b}}{\mathit {\mathit b}}{\mathit {\mathit b}}$ Channels with the ATLAS Detector