cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.3535/03t-45j-n78
title: Salix lapponum L.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03t-ckg-dpy
title: Anthoxanthum L.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03t-h4y-exv
title: Sparganium emersum Rehmann

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03t-j5j-n04
title: Persicaria amphibia (L.) Gray

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03t-jb4-64m
title: Juncus stygius L.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03t-qk3-yww
title: Salix myrsinifolia subsp. myrsinifolia

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03t-rh0-qdw
title: Stellaria longifolia (Regel) Muhl. ex Willd.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03v-1l5-tgf
title: Carex oederi var. oederi

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03t-2ns-fw8
title: Viscaria vulgaris Röhl.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03v-6jp-lef
title: Alchemilla glaucescens Wallr.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03v-e5j-6ec
title: Plantae

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03v-ete-vve
title: Geranium bohemicum L.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03v-fv5-jff
title: Carex cespitosa L.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03v-g82-le0
title: Woodsia glabella R. Br.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03v-wl4-byx
title: Rumex maritimus L.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03v-xhz-hps
title: Micranthes stellaris (L.) Galasso, Banfi & Soldano

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03v-y3l-255
title: Agrostis gigantea Roth

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03v-zyq-l6d
title: Salix myrsinifolia × phylicifolia x myrsinifolia ssp. myrsinifolia × phylicifolia

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03w-906-0ep
title: Carex mackenziei V.I.Krecz.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03w-cv8-plx
title: Lathyrus pratensis L.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03w-kvd-7w8
title: Epipactis atrorubens (Hoffm.) Besser

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03w-m4q-d3j
title: Plantae

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03w-nlq-2lw
title: Silene involucrata subsp. tenella (Tolm.) Bocquet

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03w-rd2-rjy
title: Plantago lanceolata L.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03w-tcb-gh9
title: Rorippa sylvestris (L.) Besser

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03w-zwz-x6b
title: Alopecurus arundinaceus Poir.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03x-3h2-55h
title: Cakile maritima Scop.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03x-6mc-l7m
title: Cardamine hirsuta L.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03x-acc-vlb
title: Ranunculus acris L.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03x-dl5-wa4
title: Caltha palustris L.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03x-l8z-kg8
title: Juncus filiformis L.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03x-mz7-wmk
title: Bromus secalinus L.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03x-t86-rtc
title: Elodea canadensis Michx.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03w-r66-ns1
title: Micranthes nivalis (L.) Small

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03x-el7-t3x
title: Stellaria palustris (Murray ex Ehrh.) Hoffm.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03x-f5j-mfw
title: Rorippa palustris (L.) Besser

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03x-tgy-hvy
title: Neottia nidus-avis (L.) Rich.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.17043/tarfala-rivgojiehkki-res-2
title: Ice thickness and bed topography for Rivgojiehkki, northern Sweden
DOI: 10.3535/03y-avk-by1
title: Polygonatum odoratum (Mill.) Druce

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03y-pxs-jwt
title: Oxybasis rubra (L.) S. Fuentes, Uotila & Borsch

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03y-q7z-3y0
title: Trollius europaeus L.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03y-vfb-fnl
title: Salix myrsinifolia subsp. borealis (Fr.) Hyl.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03y-zv3-cxf
title: Carex chordorrhiza L.f.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.15468/dl.gp37qj
title: Occurrence Download

description: A dataset containing 99 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Country is Colombia",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "OccurrenceStatus is Present",
 "PublishingOrg is d5ef14a1-5177-4547-9ce2-46d84a4214eb",
 "TaxonKey is Galictis vittata"
 ]
}

 The dataset includes 99 records from 9 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0060662-251120083545085/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.3535/03z-49x-2n6
title: Dichodon cerastoides (L.) Rchb.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03z-6p9-l5p
title: Juncus bulbosus L.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03z-d2f-gpv
title: Lathyrus vernus (L.) Bernh.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03z-dqt-448
title: Avena sativa L.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03z-hw7-lxk
title: Sparganium L.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.17026/ar/wwx0qu
title: PAN-00164519 - coarse ware pitcher type Niederb. 98

description: &lt;p&gt;This find is registered at Portable Antiquities of the Netherlands with number PAN-00164519&lt;/p&gt;
description: Modified: 2025-11-17T16:42:47+01:00
DOI: 10.3535/03z-k1j-0py
title: Anthyllis vulneraria subsp. vulneraria

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03z-kqh-tx4
title: Scheuchzeria palustris L.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03z-mdd-62l
title: Sisymbrium orientale L.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/03z-w50-rrz
title: Maianthemum bifolium (L.) F.W.Schmidt

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/040-2bk-7q3
title: Carex bigelowii subsp. bigelowii

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/040-4gm-aq3
title: Thalictrum simplex subsp. boreale (F. Nyl.) Á. Löve & D. Löve

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.3535/040-blb-tds
title: Potentilla argentea L.

description: Digital Specimen for the physical specimen hosted at Finnish Museum of Natural History.
DOI: 10.17182/hepdata.158371.v2/t1
title: "Nonresonant upper limits" of "Search for the nonresonant and resonant production of a Higgs boson in association with an additional scalar boson in the $γγττ$ final state in proton-proton collisions at $\sqrt{s}$ = 13 TeV"

description: Observed and expected 95% CL upper limits on the nonresonant $\mathrm{HH}$ production cross section, $\sigma(\mathrm{pp} \to \mathrm{HH})$, as a function of the Higgs boson self-coupling strength modifier $\kappa_\lambda$. All Higgs boson couplings other than $\lambda$ are assumed to have the values predicted in the SM.
description: The results of a search for the production of two scalar bosons in final states with two photons and two tau leptons are presented. The search considers both nonresonant production of a Higgs boson pair, $\mathrm{HH}$, and resonant production via a new boson $\mathrm{X}$ which decays either to $\mathrm{HH}$ or to $\mathrm{H}$ and a new scalar $\mathrm{Y}$. The analysis uses up to 138 fb$^{-1}$ of proton-proton collision data, recorded between 2016 and 2018 by the CMS experiment at the LHC at a center-of-mass energy of 13 TeV. No evidence for signal is found in the data. For the nonresonant production, the observed (expected) upper limit at 95% confidence level (CL) on the $\mathrm{HH}$ production cross section is set at 930 (740) fb, corresponding to 33 (26) times the standard model prediction. At 95% CL, $\mathrm{HH}$ production is observed (expected) to be excluded for values of $\kappa_\lambda$ outside the range between -12 (-9.4) and 17 (15). Observed (expected) upper limits at 95% CL for the $\mathrm{X} \to \mathrm{HH}$ cross section are found to be within 160 to 2200 (200 to 1800) fb, depending on the mass of $\mathrm{X}$. In the $\mathrm{X} \to \mathrm{YH}$ production scenario, the observed (expected) upper limits vary between 0.059 -1.2 fb (0.87 -0.68 fb) for the $\mathrm{X} \to \mathrm{Y}(\to\tau\tau)\mathrm{H}(\to\gamma\gamma)$ search. For the $\mathrm{X} \to \mathrm{Y}(\to\gamma\gamma)\mathrm{H}(\to\tau\tau)$ search the observed (expected) upper limits vary between 0.69 -15 fb (0.73 -8.3 fb) in the low $\mathrm{Y}$ mass search, tightening constraints on the NMSSM, and between 0.64 -10 fb (0.70 -7.6 fb) in the high $\mathrm{Y}$ mass search.
DOI: 10.17182/hepdata.158371.v2/t2
title: "Upper limits on EFT benchmarks" of "Search for the nonresonant and resonant production of a Higgs boson in association with an additional scalar boson in the $γγττ$ final state in proton-proton collisions at $\sqrt{s}$ = 13 TeV"

description: Observed and expected 95% CL upper limits on the nonresonant $\mathrm{HH}$ production cross section, $\sigma(\mathrm{pp} \to \mathrm{HH})$, for thirteen different BSM benchmark scenarios from [arXiv:1507.02245, arXiv:1806.05162] which consider different values of the couplings, $\kappa_\lambda$, $\kappa_t$, $c_{2g}$, $c_g$, and $c_2$ (defined in Table 1).
description: The results of a search for the production of two scalar bosons in final states with two photons and two tau leptons are presented. The search considers both nonresonant production of a Higgs boson pair, $\mathrm{HH}$, and resonant production via a new boson $\mathrm{X}$ which decays either to $\mathrm{HH}$ or to $\mathrm{H}$ and a new scalar $\mathrm{Y}$. The analysis uses up to 138 fb$^{-1}$ of proton-proton collision data, recorded between 2016 and 2018 by the CMS experiment at the LHC at a center-of-mass energy of 13 TeV. No evidence for signal is found in the data. For the nonresonant production, the observed (expected) upper limit at 95% confidence level (CL) on the $\mathrm{HH}$ production cross section is set at 930 (740) fb, corresponding to 33 (26) times the standard model prediction. At 95% CL, $\mathrm{HH}$ production is observed (expected) to be excluded for values of $\kappa_\lambda$ outside the range between -12 (-9.4) and 17 (15). Observed (expected) upper limits at 95% CL for the $\mathrm{X} \to \mathrm{HH}$ cross section are found to be within 160 to 2200 (200 to 1800) fb, depending on the mass of $\mathrm{X}$. In the $\mathrm{X} \to \mathrm{YH}$ production scenario, the observed (expected) upper limits vary between 0.059 -1.2 fb (0.87 -0.68 fb) for the $\mathrm{X} \to \mathrm{Y}(\to\tau\tau)\mathrm{H}(\to\gamma\gamma)$ search. For the $\mathrm{X} \to \mathrm{Y}(\to\gamma\gamma)\mathrm{H}(\to\tau\tau)$ search the observed (expected) upper limits vary between 0.69 -15 fb (0.73 -8.3 fb) in the low $\mathrm{Y}$ mass search, tightening constraints on the NMSSM, and between 0.64 -10 fb (0.70 -7.6 fb) in the high $\mathrm{Y}$ mass search.
DOI: 10.17182/hepdata.158371.v2/t3
title: "$\mathrm{X}^{(0)} \to \mathrm{HH}$ limits" of "Search for the nonresonant and resonant production of a Higgs boson in association with an additional scalar boson in the $γγττ$ final state in proton-proton collisions at $\sqrt{s}$ = 13 TeV"

description: Observed and expected 95% CL upper limits on the cross section for the resonant production of a new spin-0 particle $\mathrm{X}^{(0)}$ which decays to Higgs boson pairs, $\sigma(\mathrm{pp} \to \mathrm{X}^{(0)} \to \mathrm{HH})$, given for different values of $m_\mathrm{X}$ in the range 260-1000 GeV. Theoretical predictions for this cross section assuming that $\mathrm{X}^{(0)}$ is a radion particle with $\Lambda_R = 2$ TeV and 3 TeV are also provided [arXiv:1404.0102].
description: The results of a search for the production of two scalar bosons in final states with two photons and two tau leptons are presented. The search considers both nonresonant production of a Higgs boson pair, $\mathrm{HH}$, and resonant production via a new boson $\mathrm{X}$ which decays either to $\mathrm{HH}$ or to $\mathrm{H}$ and a new scalar $\mathrm{Y}$. The analysis uses up to 138 fb$^{-1}$ of proton-proton collision data, recorded between 2016 and 2018 by the CMS experiment at the LHC at a center-of-mass energy of 13 TeV. No evidence for signal is found in the data. For the nonresonant production, the observed (expected) upper limit at 95% confidence level (CL) on the $\mathrm{HH}$ production cross section is set at 930 (740) fb, corresponding to 33 (26) times the standard model prediction. At 95% CL, $\mathrm{HH}$ production is observed (expected) to be excluded for values of $\kappa_\lambda$ outside the range between -12 (-9.4) and 17 (15). Observed (expected) upper limits at 95% CL for the $\mathrm{X} \to \mathrm{HH}$ cross section are found to be within 160 to 2200 (200 to 1800) fb, depending on the mass of $\mathrm{X}$. In the $\mathrm{X} \to \mathrm{YH}$ production scenario, the observed (expected) upper limits vary between 0.059 -1.2 fb (0.87 -0.68 fb) for the $\mathrm{X} \to \mathrm{Y}(\to\tau\tau)\mathrm{H}(\to\gamma\gamma)$ search. For the $\mathrm{X} \to \mathrm{Y}(\to\gamma\gamma)\mathrm{H}(\to\tau\tau)$ search the observed (expected) upper limits vary between 0.69 -15 fb (0.73 -8.3 fb) in the low $\mathrm{Y}$ mass search, tightening constraints on the NMSSM, and between 0.64 -10 fb (0.70 -7.6 fb) in the high $\mathrm{Y}$ mass search.
DOI: 10.17182/hepdata.158371.v2/t4
title: "$\mathrm{X}^{(2)} \to \mathrm{HH}$ limits" of "Search for the nonresonant and resonant production of a Higgs boson in association with an additional scalar boson in the $γγττ$ final state in proton-proton collisions at $\sqrt{s}$ = 13 TeV"

description: Observed and expected 95% CL upper limits on the cross section for the resonant production of a new spin-2 particle $\mathrm{X}^{(2)}$ which decays to Higgs boson pairs, $\sigma(\mathrm{pp} \to \mathrm{X}^{(2)} \to \mathrm{HH})$, given for different values of $m_\mathrm{X}$ in the range 260-1000 GeV. Theoretical predictions for this cross section assuming that $\mathrm{X}^{(2)}$ is a graviton particle with $\kappa / \overline{M_{pl}} = 1$ are also provided [arXiv:1404.0102].
description: The results of a search for the production of two scalar bosons in final states with two photons and two tau leptons are presented. The search considers both nonresonant production of a Higgs boson pair, $\mathrm{HH}$, and resonant production via a new boson $\mathrm{X}$ which decays either to $\mathrm{HH}$ or to $\mathrm{H}$ and a new scalar $\mathrm{Y}$. The analysis uses up to 138 fb$^{-1}$ of proton-proton collision data, recorded between 2016 and 2018 by the CMS experiment at the LHC at a center-of-mass energy of 13 TeV. No evidence for signal is found in the data. For the nonresonant production, the observed (expected) upper limit at 95% confidence level (CL) on the $\mathrm{HH}$ production cross section is set at 930 (740) fb, corresponding to 33 (26) times the standard model prediction. At 95% CL, $\mathrm{HH}$ production is observed (expected) to be excluded for values of $\kappa_\lambda$ outside the range between -12 (-9.4) and 17 (15). Observed (expected) upper limits at 95% CL for the $\mathrm{X} \to \mathrm{HH}$ cross section are found to be within 160 to 2200 (200 to 1800) fb, depending on the mass of $\mathrm{X}$. In the $\mathrm{X} \to \mathrm{YH}$ production scenario, the observed (expected) upper limits vary between 0.059 -1.2 fb (0.87 -0.68 fb) for the $\mathrm{X} \to \mathrm{Y}(\to\tau\tau)\mathrm{H}(\to\gamma\gamma)$ search. For the $\mathrm{X} \to \mathrm{Y}(\to\gamma\gamma)\mathrm{H}(\to\tau\tau)$ search the observed (expected) upper limits vary between 0.69 -15 fb (0.73 -8.3 fb) in the low $\mathrm{Y}$ mass search, tightening constraints on the NMSSM, and between 0.64 -10 fb (0.70 -7.6 fb) in the high $\mathrm{Y}$ mass search.
DOI: 10.17182/hepdata.158371.v2/t5
title: "$\text{Y} \to \tau\tau$ limits ($m_\text{X}$ stacks)" of "Search for the nonresonant and resonant production of a Higgs boson in association with an additional scalar boson in the $γγττ$ final state in proton-proton collisions at $\sqrt{s}$ = 13 TeV"

description: Observed and expected 95% CL upper limits on the cross section for the resonant production of a new scalar particle $\mathrm{X}$ which decays to a SM Higgs boson and a new scalar particle $\mathrm{Y}$ which subsequently decay to a pair of photons and a pair of tau leptons, $\sigma(\mathrm{pp} \to \mathrm{X} \to \mathrm{YH} \to \gamma\gamma\tau\tau)$. The limits are shown for different values of $m_\mathrm{Y}$ in the range 50-800 GeV and at particular values of $m_\mathrm{X}$ in the range 300-1000 GeV.
description: The results of a search for the production of two scalar bosons in final states with two photons and two tau leptons are presented. The search considers both nonresonant production of a Higgs boson pair, $\mathrm{HH}$, and resonant production via a new boson $\mathrm{X}$ which decays either to $\mathrm{HH}$ or to $\mathrm{H}$ and a new scalar $\mathrm{Y}$. The analysis uses up to 138 fb$^{-1}$ of proton-proton collision data, recorded between 2016 and 2018 by the CMS experiment at the LHC at a center-of-mass energy of 13 TeV. No evidence for signal is found in the data. For the nonresonant production, the observed (expected) upper limit at 95% confidence level (CL) on the $\mathrm{HH}$ production cross section is set at 930 (740) fb, corresponding to 33 (26) times the standard model prediction. At 95% CL, $\mathrm{HH}$ production is observed (expected) to be excluded for values of $\kappa_\lambda$ outside the range between -12 (-9.4) and 17 (15). Observed (expected) upper limits at 95% CL for the $\mathrm{X} \to \mathrm{HH}$ cross section are found to be within 160 to 2200 (200 to 1800) fb, depending on the mass of $\mathrm{X}$. In the $\mathrm{X} \to \mathrm{YH}$ production scenario, the observed (expected) upper limits vary between 0.059 -1.2 fb (0.87 -0.68 fb) for the $\mathrm{X} \to \mathrm{Y}(\to\tau\tau)\mathrm{H}(\to\gamma\gamma)$ search. For the $\mathrm{X} \to \mathrm{Y}(\to\gamma\gamma)\mathrm{H}(\to\tau\tau)$ search the observed (expected) upper limits vary between 0.69 -15 fb (0.73 -8.3 fb) in the low $\mathrm{Y}$ mass search, tightening constraints on the NMSSM, and between 0.64 -10 fb (0.70 -7.6 fb) in the high $\mathrm{Y}$ mass search.
DOI: 10.17182/hepdata.158371.v2/t6
title: "$\text{Y} \to \tau\tau$ limits ($m_\text{Y}$ stacks)" of "Search for the nonresonant and resonant production of a Higgs boson in association with an additional scalar boson in the $γγττ$ final state in proton-proton collisions at $\sqrt{s}$ = 13 TeV"

description: Observed and expected 95% CL upper limits on the cross section for the resonant production of a new scalar particle $\mathrm{X}$ which decays to a SM Higgs boson and a new scalar particle $\mathrm{Y}$ which subsequently decay to a pair of photons and a pair of tau leptons, $\sigma(\mathrm{pp} \to \mathrm{X} \to \mathrm{YH} \to \gamma\gamma\tau\tau)$. The limits are shown for different values of $m_\mathrm{X}$ in the range 300-1000 GeV and at particular values of $m_\mathrm{Y}$ in the range 50-800 GeV.
description: The results of a search for the production of two scalar bosons in final states with two photons and two tau leptons are presented. The search considers both nonresonant production of a Higgs boson pair, $\mathrm{HH}$, and resonant production via a new boson $\mathrm{X}$ which decays either to $\mathrm{HH}$ or to $\mathrm{H}$ and a new scalar $\mathrm{Y}$. The analysis uses up to 138 fb$^{-1}$ of proton-proton collision data, recorded between 2016 and 2018 by the CMS experiment at the LHC at a center-of-mass energy of 13 TeV. No evidence for signal is found in the data. For the nonresonant production, the observed (expected) upper limit at 95% confidence level (CL) on the $\mathrm{HH}$ production cross section is set at 930 (740) fb, corresponding to 33 (26) times the standard model prediction. At 95% CL, $\mathrm{HH}$ production is observed (expected) to be excluded for values of $\kappa_\lambda$ outside the range between -12 (-9.4) and 17 (15). Observed (expected) upper limits at 95% CL for the $\mathrm{X} \to \mathrm{HH}$ cross section are found to be within 160 to 2200 (200 to 1800) fb, depending on the mass of $\mathrm{X}$. In the $\mathrm{X} \to \mathrm{YH}$ production scenario, the observed (expected) upper limits vary between 0.059 -1.2 fb (0.87 -0.68 fb) for the $\mathrm{X} \to \mathrm{Y}(\to\tau\tau)\mathrm{H}(\to\gamma\gamma)$ search. For the $\mathrm{X} \to \mathrm{Y}(\to\gamma\gamma)\mathrm{H}(\to\tau\tau)$ search the observed (expected) upper limits vary between 0.69 -15 fb (0.73 -8.3 fb) in the low $\mathrm{Y}$ mass search, tightening constraints on the NMSSM, and between 0.64 -10 fb (0.70 -7.6 fb) in the high $\mathrm{Y}$ mass search.