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1.
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Dark Matter Effects On Neutron Star Properties
/ Ellis, John (NICPB, Tallinn ; King's Coll. London ; CERN) ; Hütsi, Gert (NICPB, Tallinn ; Tartu U.) ; Kannike, Kristjan (NICPB, Tallinn) ; Marzola, Luca (NICPB, Tallinn) ; Raidal, Martti (NICPB, Tallinn) ; Vaskonen, Ville (NICPB, Tallinn)
We study possible effects of a dark matter (DM) core on the maximum mass of a neutron star (NS), on the mass-radius relation and on the NS tidal deformability parameter $\Lambda$. We show that all these quantities would in general be reduced in the presence of a DM core. [...]
arXiv:1804.01418; CERN-TH-2018-072; KCL-PH-TH/2018-13; KCL-PH-TH-2018-13.-
2018-06-15 - 7 p.
- Published in : Phys. Rev. D 97 (2018) 123007
Article from SCOAP3: PDF; Fulltext: PDF;
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2.
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The EDGES 21 cm Anomaly and Properties of Dark Matter
/ Fraser, Sean (NICPB, Tallinn) ; Hektor, Andi (NICPB, Tallinn) ; Hütsi, Gert (NICPB, Tallinn) ; Kannike, Kristjan (NICPB, Tallinn) ; Marzo, Carlo (NICPB, Tallinn) ; Marzola, Luca (NICPB, Tallinn) ; Spethmann, Christian (NICPB, Tallinn) ; Racioppi, Antonio (NICPB, Tallinn) ; Raidal, Martti (CERN ; NICPB, Tallinn) ; Vaskonen, Ville (NICPB, Tallinn) et al.
The recently claimed anomaly in the measurement of the 21 cm hydrogen absorption signal by EDGES at $z\sim 17$, if cosmological, requires the existence of new physics. The possible attempts to resolve the anomaly rely on either (i) cooling the hydrogen gas via new dark matter-hydrogen interactions or (ii) modifying the soft photon background beyond the standard CMB one, as possibly suggested also by the ARCADE~2 excess. [...]
arXiv:1803.03245; CERN-TH-2018-053.-
2018-10-10 - 6 p.
- Published in : Phys. Lett. B 785 (2018) 159-164
Article from SCOAP3: PDF; Fulltext: PDF;
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3.
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Search for Dark Matter Effects on Gravitational Signals from Neutron Star Mergers
/ Ellis, John (NICPB, Tallinn ; CERN ; King's Coll. London) ; Hektor, Andi (NICPB, Tallinn) ; Hütsi, Gert (NICPB, Tallinn ; Tartu Observ.) ; Kannike, Kristjan (NICPB, Tallinn) ; Marzola, Luca (NICPB, Tallinn) ; Raidal, Martti (NICPB, Tallinn) ; Vaskonen, Ville (NICPB, Tallinn)
Motivated by the recent detection of the gravitational wave signal emitted by a binary neutron star merger, we analyse the possible impact of dark matter on such signals. We show that dark matter cores in merging neutron stars may yield an observable supplementary peak in the gravitational wave power spectral density following the merger, which could be distinguished from the features produced by the neutron components..
arXiv:1710.05540; CERN-TH-2017-208; KCL-PH-TH-2017-50.-
2018-06-10 - 4 p.
- Published in : Phys. Lett. B 781 (2018) 607-610
Article from SCOAP3: PDF; Fulltext: PDF;
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4.
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The Higgs of the Higgs and the diphoton channel
/ Kannike, Kristjan (NICPB, Tallinn) ; Pelaggi, Giulio Maria (Pisa U. ; INFN, Pisa) ; Salvio, Alberto (CERN) ; Strumia, Alessandro (NICPB, Tallinn ; Pisa U. ; INFN, Pisa ; CERN)
LHC results do not confirm conventional natural solutions to the Higgs mass hierarchy problem, motivating alternative interpretations where a hierarchically small weak scale is generated from a dimension-less quantum dynamics. We propose weakly and strongly-coupled models where the field that breaks classical scale invariance giving mass to itself and to the Higgs is identified with a possible new resonance within the LHC reach. [...]
arXiv:1605.08681; CERN-TH-2016-128; IFUP-TH-2016; CERN-TH-2016-128.-
2016-07-20 - 21 p.
- Published in : JHEP 07 (2016) 101
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint
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5.
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One or more Higgs bosons?
/ Barbieri, Riccardo (Pisa, Scuola Normale Superiore ; INFN, Pisa) ; Buttazzo, Dario (Pisa, Scuola Normale Superiore ; INFN, Pisa ; CERN) ; Kannike, Kristjan (Pisa, Scuola Normale Superiore ; INFN, Pisa ; NICPB, Tallinn) ; Sala, Filippo (Pisa, Scuola Normale Superiore ; INFN, Pisa ; LBNL, Berkeley) ; Tesi, Andrea (Pisa, Scuola Normale Superiore ; INFN, Pisa)
Now that one has been found, the search for signs of more scalars is a primary task of current and future experiments. In the motivated hypothesis that the extra Higgs bosons of the next-to-minimal supersymmetric Standard Model (NMSSM) be the lightest new particles around, we outline a possible overall strategy to search for signs of the CP-even states. [...]
arXiv:1307.4937; CERN-PH-TH-2013-170; CERN-PH-TH-2013-170.-
2013-09-10 - 9 p.
- Published in : Phys. Rev. D 88 (2013) 055011
APS Published version, local copy: PDF; Fulltext: PDF; External link: Preprint
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6.
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7.
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The universal Higgs fit
/ Giardino, Pier Paolo (Pisa U. ; INFN, Pisa ; CERN) ; Kannike, Kristjan (Pisa, Scuola Normale Superiore ; INFN, Pisa ; NICPB, Tallinn) ; Masina, Isabella (Ferrara U. ; INFN, Ferrara ; Southern Denmark U., CP3-Origins) ; Raidal, Martti (NICPB, Tallinn ; Tartu, Inst. Phys.) ; Strumia, Alessandro (Pisa U. ; INFN, Pisa ; NICPB, Tallinn)
We perform a state-of-the-art global fit to all Higgs data. We synthesise them into a 'universal' form, which allows to easily test any desired model. [...]
arXiv:1303.3570; CERN-PH-TH-2013-052; IFUP-TH; CERN-PH-TH-2013-052.-
2014 - 29 p.
- Published in : JHEP 05 (2014) 046
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint
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8.
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9.
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Is the resonance at 125 GeV the Higgs boson?
/ Giardino, Pier Paolo (Pisa U. ; INFN, Pisa) ; Kannike, Kristjan (Pisa, Scuola Normale Superiore ; INFN, Pisa ; NICPB, Tallinn) ; Raidal, Martti (NICPB, Tallinn ; CERN ; Tartu, Inst. Phys.) ; Strumia, Alessandro (Pisa U. ; INFN, Pisa ; NICPB, Tallinn)
The recently discovered resonance at 125 GeV has properties remarkably close to those of the Standard Model Higgs boson. We perform model-independent fits of all presently available data. [...]
arXiv:1207.1347; CERN-PH-TH-2012-208; CERN-PH-TH-2012-208.-
2012-12-05 - 11 p.
- Published in : Phys. Lett. B 718 (2012) 469-474
Fulltext: XML; External link: Preprint
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10.
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Reconstructing Higgs boson properties from the LHC and Tevatron data
/ Giardino, Pier Paolo (Pisa U. ; INFN, Pisa) ; Kannike, Kristjan (Pisa, Scuola Normale Superiore ; INFN, Pisa) ; Raidal, Martti (NICPB, Tallinn ; CERN ; Tartu, Inst. Phys.) ; Strumia, Alessandro (Pisa U. ; INFN, Pisa ; NICPB, Tallinn)
We perform a phenomenological fit to all ATLAS, CMS, CDF and D0 Higgs boson data available after Moriond 2012. We allow all Higgs boson branching fractions, its couplings to standard model particles, as well as to an hypothetical invisible sector to vary freely, and determine their current favourite values. [...]
arXiv:1203.4254; CERN-PH-TH-2012-066; CERN-PH-TH-2012-066.-
2012 - 14 p.
- Published in : JHEP 06 (2012) 117
Springer Open Access article: PDF; External link: Preprint
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