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2019-06-11
11:53
[PUBDB-2019-02456] Talk (non-conference)

Summary on the PATRAS workshop: Theory
QU Day, DESYHamburg, DESY, Germany, 11 Jun 2019 - 11 Jun 20192019-06-112019-06-11
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2019-05-15
13:08
OpenAccess [PUBDB-2019-02289] Preprint/Report

A Lorentzian inversion formula for defect CFT
[DESY-19-039; arXiv:1903.05222]
 GO
We present a Lorentzian inversion formula valid for any defect CFT that extracts the bulk channel CFT data as an analytic function of the spin variable. This result complements the already obtained inversion formula for the corresponding defect channel, and makes it now possible to implement the analytic bootstrap program for defect CFT, by going back and forth between both channels. [...]
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2019-05-15
13:02
Embargoed OpenAccess [PUBDB-2019-02288] Report/Journal Article
et al
BBN constraints on the annihilation of MeV-scale dark matter
[arXiv:1901.06944; DESY-19-006]
Thermal dark matter at the MeV scale faces stringent bounds from a variety of cosmological probes. Here we perform a detailed evaluation of BBN bounds on the annihilation cross section of dark matter with a mass $1\,\text{MeV} \lesssim m_\chi \lesssim 1\,\text{GeV}$. [...]
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2019-05-15
10:49
OpenAccess [PUBDB-2019-02287] Report/Journal Article

Parallel adaptive Monte Carlo integration with the event generator WHIZARD
[arXiv:1811.09711; DESY-18-089; SI-HEP-2018-32]
We describe a new parallel approach to the evaluation of phase space for Monte-Carlo event generation, implemented within the framework of the WHIZARD package. The program realizes a twofold self-adaptive multi-channel parameterization of phase space and makes use of the standard OpenMP and MPI protocols for parallelization. [...]
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2019-05-15
10:46
Embargoed OpenAccess [PUBDB-2019-02286] Report/Journal Article
et al
Emerging chromo-natural inflation
[DESY-18-106; arXiv:1807.03358]
The shift-symmetric coupling of a pseudo-scalar particle driving inflation to gauge fields provides a unique way of probing cosmic inflation. We show for an SU(2) gauge group how a classical isotropic background gauge field develops from the standard quantum mechanical vacuum in the far past. [...]
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2019-05-15
10:26
arXiv [PUBDB-2019-02285] Journal Article/Report/Contribution to a conference proceedings

A light dimuon resonance in B decays?
[arXiv:1809.11061; DESY-18-172]
7th Workshop on Theory, Phenomenology and Experiments in Flavour Physics : The Future of BSM Physics., FPCapri 2018, Anacapri, CapriAnacapri, Capri, Italy, 8 Jun 2018 - 10 Jun 20182018-06-082018-06-10
Contributions / Info
Nuclear and particle physics proceedings 303-305, 14 - 19 () [10.1016/j.nuclphysbps.2019.03.004]  GO
The observed deviations from the Standard Model in several $b \to s\mu\mu$ processes can be explained in terms of a new vector boson produced on-shell in B meson decays. A mass of 2.5-3 GeV and a total width of 10-20% allow to hide the associated dimuon bump in the poorly known charmonium region, and the large invisible decay width can be interpreted in terms of Dark Matter. [...]
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2019-05-15
10:19
OpenAccess [PUBDB-2019-02284] Report/Journal Article

Singleton portals to the twin sector
[DESY-18-187; arXiv:1811.05977]
The mirror twin Higgs framework allows for a natural Higgs mass while being consistent with collider bounds on colored symmetry partners to standard model quarks. This mechanism relies crucially on a discrete symmetry which relates each standard model field to a mirror partner. [...]
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2019-05-15
10:17
OpenAccess [PUBDB-2019-02283] Report/Journal Article

Jet veto resummation with jet rapidity cuts
[arXiv:1810.12911; DESY-18-189]
Jet vetoes are widely used in experimental analyses at the LHC to distinguish different hard-interaction processes. Experimental jet selections require a cut on the (pseudo)rapidity of reconstructed jets, $|\eta_{\rm jet}| \leq \eta_{\rm cut}$. [...]
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2019-05-15
10:14
OpenAccess [PUBDB-2019-02282] Report/Journal Article

Light Dark Matter at Neutrino Experiments
[DESY-18-194; arXiv:1811.00520]
Sub-GeV Dark Matter particles upscattered by cosmic rays gain enough kinetic energy to pass the thresholds of large volume detectors on Earth. We then use public Super-Kamiokande data to derive a novel limit on the scattering cross section of Dark Matter with electrons that extends down to sub-keV masses, closing a previously allowed wide region of parameter space. [...]
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2019-05-15
10:11
OpenAccess [PUBDB-2019-02281] Report/Journal Article

Factorisation of soft gluons in multiparton scattering
[arXiv:1812.09509; DESY-18-204]
We show that soft gluons exchanged between the two colliding protons in multiparton scattering processes can be decoupled, such that their effects are described by the vacuum expectation values of Wilson lines. Our argument relies on nonabelian Ward identities and generalises the proof of factorisation for single Drell-Yan production given by Collins, Soper and Sterman..
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