306 citations · 2.5k across the 57 of their papers we have counts for
25 papers · 1 filter
Galactic rotation curves versus ultralight dark matter: A systematic comparison with SPARC data
Nitsan Bar, Kfir Blum, Chen Sun
We look for and place observational constraints on the imprint of ultralight dark matter (ULDM) soliton cores in rotation-dominated galaxies. Extending previous analyses, we find a…
Is there a supernova bound on axions?
Nitsan Bar, Kfir Blum, Guido D'Amico
We present a critical assessment of the SN1987A supernova cooling bound on axions and other light particles. Core-collapse simulations used in the literature to substantiate the bo…
Neutrinoless double-beta decay with massive scalar emission
Kfir Blum, Yosef Nir, Michal Shavit
Searches for neutrino-less double-beta decay () place an important constraint on models where light fields beyond the Standard Model participate in the neutrino mass mechan…
Exotic colored scalars at the LHC
Kfir Blum, Aielet Efrati, Claudia Frugiuele +1
We study the phenomenology of exotic color-triplet scalar particles with charge and . If is a non-singlet of representation, mass…
Self-consistent Calculation of the Sommerfeld Enhancement
Kfir Blum, Ryosuke Sato, Tracy R. Slatyer
A calculation of the Sommerfeld enhancement is presented and applied to the problem of s-wave non-relativistic dark matter annihilation. The difference from previous computations i…
On a possible large width 750 GeV diphoton resonance at ATLAS and CMS
Daniel Aloni, Kfir Blum, Avital Dery +2
The ATLAS and CMS experiments at the LHC have reported an excess of diphoton events with invariant mass around 750 GeV, with local significance of about and , respec…
Vacuum stability bounds on Higgs coupling deviations
Kfir Blum, Raffaele Tito D'Agnolo, JiJi Fan
We analyze the constraints imposed by Higgs vacuum stability on models with new fermions beyond the Standard Model. We focus on the phenomenology of Higgs couplings accessible at t…
An Ultimate Target for Dark Matter Searches
Kfir Blum, Yanou Cui, Marc Kamionkowski
The combination of S-matrix unitarity and the dynamics of thermal freeze-out for massive relic particles (denoted here simply by WIMPs) implies a lower limit on the density of such…
WIMP Dark Matter through the Dilaton Portal
Kfir Blum, Mathieu Cliche, Csaba Csaki +1
We study a model in which dark matter couples to the Standard Model through a dilaton of a sector with spontaneously broken approximate scale invariance. Scale invariance fixes the…
High energy neutrino telescopes as a probe of the neutrino mass mechanism
Kfir Blum, Anson Hook, Kohta Murase
We show that measurements of the spectral shape and flavor ratios of high energy astrophysical neutrinos at neutrino telescopes can be sensitive to the details of the neutrino mass…
Constraining Axion Dark Matter with Big Bang Nucleosynthesis
Kfir Blum, Raffaele Tito D'Agnolo, Mariangela Lisanti +1
We show that Big Bang Nucleosynthesis (BBN) significantly constrains axion-like dark matter. The axion acts like an oscillating QCD angle that redshifts in the early universe,…
2:1 for Naturalness at the LHC?
Nima Arkani-Hamed, Kfir Blum, Raffaele Tito D'Agnolo +1
A large enhancement of a factor of 1.5 - 2 in Higgs production and decay in the diphoton channel, with little deviation in the ZZ channel, can only plausibly arise from a loop of n…
Natural SUSY Predicts: Higgs Couplings
Kfir Blum, Raffaele Tito D'Agnolo, JiJi Fan
We study Higgs production and decays in the context of natural SUSY, allowing for an extended Higgs sector to account for a 125 GeV lightest Higgs boson. Under broad assumptions, H…
2 Higgs or not 2 Higgs
Kfir Blum, Raffaele Tito D'Agnolo
Motivated by recent results from the LHC experiments, we analyze Higgs couplings in two Higgs doublet models with an approximate PQ symmetry. Models of this kind can naturally acco…
Asymmetric Higgsino Dark Matter
Kfir Blum, Aielet Efrati, Yuval Grossman +2
In the supersymmetric framework, a higgsino asymmetry exists in the universe before the electroweak phase transition. We investigate whether the higgsino is a viable asymmetric dar…
Scalar-mediated forward-backward asymmetry
Kfir Blum, Yonit Hochberg, Yosef Nir
A large forward-backward asymmetry in production, for large invariant mass of the system, has been recently observed by the CDF collaboration. Among the scalar…
Implications of the CDF t\bar{t} Forward-Backward Asymmetry for Boosted Top Physics
Kfir Blum, Cédric Delaunay, Oram Gedalia +5
New physics at a high scale Lambda can affect top-related observables at O(1/Lambda^2) via the interference of effective four quark operators with the SM amplitude. The (\bar{u} ga…
Implications of large dimuon CP asymmetry in B_{d,s} decays on minimal flavor violation with low tan beta
Kfir Blum, Yonit Hochberg, Yosef Nir
The D0 collaboration has recently announced evidence for a dimuon CP asymmetry in B_{d,s} decays of order one percent. If confirmed, this asymmetry requires new physics. We argue t…
CP violation Beyond the MSSM: Baryogenesis and Electric Dipole Moments
Kfir Blum, Cedric Delaunay, Marta Losada +2
We study electroweak baryogenesis and electric dipole moments in the presence of the two leading-order, non-renormalizable operators in the Higgs sector of the MSSM. Significant qu…
Astrophysical Implications of a Visible Dark Matter Sector from a Custodially Warped-GUT
Kaustubh Agashe, Kfir Blum, Seung J. Lee +1
We explore, within the warped extra dimensional framework, the possibility of finding anti-matter signals in cosmic rays (CRs) from dark matter (DM) annihilation. Exchange of order…
BMSSM Implications for Cosmology
Nicolas Bernal, Kfir Blum, Marta Losada +1
The addition of non-renormalizable terms involving the Higgs fields to the MSSM (BMSSM) ameliorates the little hierarchy problem of the MSSM. We analyze in detail the two main cosm…
Vacuum (Meta)Stability Beyond the MSSM
Kfir Blum, Cédric Delaunay, Yonit Hochberg
We study the stability of the Higgs potential in the framework of the effective Lagrangian beyond the MSSM. While the leading nonrenormalizable operators can shift the Higgs boson…
Combining K-\bar K mixing and D-\bar D mixing to constrain the flavor structure of new physics
Kfir Blum, Yuval Grossman, Yosef Nir +1
New physics at high energy scale often contributes to K-\bar K and D-\bar D mixings in an approximately SU(2)_L invariant way. In such a case, the combination of measurements in th…
Beyond MSSM Baryogenesis
Kfir Blum, Yosef Nir
Taking the MSSM as an effective low-energy theory, with a cut-off scale of a few TeV, can make significant modifications to the predictions concerning the Higgs and stop sectors. W…