2017-04-15
08:30 |
Anomaly-Free Dark Matter Models are not so Simple
/ Ellis, John (King's Coll. London ; CERN) ; Fairbairn, Malcolm (King's Coll. London) ; Tunney, Patrick (King's Coll. London)
We explore the anomaly-cancellation constraints on simplified dark matter (DM) models with an extra U(1)$^\prime$ gauge boson $Z'$. We show that, if the Standard Model (SM) fermions are supplemented by a single DM fermion $\chi$ that is a singlet of the SM gauge group, and the SM quarks have non-zero U(1)$^\prime$ charges, the SM leptons must also have non-zero U(1)$^\prime$ charges, in which case LHC searches impose strong constraints on the $Z'$ mass. [...]
KCL-PH-TH-2017-21; CERN-TH-2017-084; arXiv:1704.03850.-
2017-08-16 - 19 p.
- Published in : J. High Energy Phys. 1708 (2017) 053
Article from SCOAP3: PDF; Preprint: PDF;
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2017-04-13
08:29 |
Single top polarisation as a window to new physics
/ Aguilar-Saavedra, J.A. (Granada U., Theor. Phys. Astrophys.) ; Degrande, C. (CERN) ; Khatibi, S. (IPM, Tehran)
We discuss the effect of heavy new physics, parameterised in terms of four-fermion operators, in the polarisation of single top (anti-)quarks in the $t$-channel process at the LHC. It is found that for operators involving a right-handed top quark field the relative effect on the longitudinal polarisation is twice larger than the relative effect on the total cross section. [...]
CERN-TH-2017-013; arXiv:1701.05900.-
2017-06-10 - 9 p.
- Published in : Phys. Lett. B 769 (2017) 498-502
Article from SCOAP3: PDF; Elsevier Open Access article: PDF; Fulltext: PDF;
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2017-04-12
07:18 |
Colorful Twisted Top Partners and Partnerium at the LHC
/ Kats, Yevgeny (CERN ; Ben Gurion U. of Negev ; Weizmann Inst.) ; McCullough, Matthew (CERN) ; Perez, Gilad (Weizmann Inst.) ; Soreq, Yotam (MIT, Cambridge, CTP) ; Thaler, Jesse (MIT, Cambridge, CTP)
In scenarios that stabilize the electroweak scale, the top quark is typically accompanied by partner particles. In this work, we demonstrate how extended stabilizing symmetries can yield scalar or fermionic top partners that transform as ordinary color triplets but carry exotic electric charges. [...]
MIT-CTP-4897; CERN-TH-2017-073; arXiv:1704.03393.-
2017-06-23 - 38 p.
- Published in : JHEP 1706 (2017) 126
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2017-04-07
07:44 |
Long-range critical exponents near the short-range crossover
/ Behan, Connor (YITP, Stony Brook) ; Rastelli, Leonardo (YITP, Stony Brook) ; Rychkov, Slava (CERN ; Ecole Normale Superieure ; UPMC, Paris (main)) ; Zan, Bernardo (ITPP, Lausanne ; CERN)
The d-dimensional long-range Ising model, defined by spin-spin interactions decaying with the distance as the power 1/rd+s, admits a second-order phase transition with continuously varying critical exponents. At s=s*, the phase transition crosses over to the usual short-range universality class. [...]
YITP-SB-17-12; CERN-TH-2017-058; CERN-PH-TH-2017-058; arXiv:1703.03430.-
2017-06-15 - 5 p.
- Published in : Phys. Rev. Lett. 118 (2017) 241601
Fulltext: PDF; Preprint: PDF;
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2017-03-31
07:54 |
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2017-03-31
07:54 |
Higher order perturbations of Anti-de Sitter space and time-periodic solutions of vacuum Einstein equations
/ Rostworowski, Andrzej (Jagiellonian U.)
Motivated by the problem of stability of Anti-de Sitter (AdS) spacetime, we discuss nonlinear gravitational perturbations of maximally symmetric solutions of vacuum Einstein equations in general and the case of AdS in particular. We present the evidence that, similarly to the self-gravitating scalar field at spherical symmetry, the negative cosmological constant allows for the existence of globally regular, asymptotically AdS, time-periodic solutions of vacuum Einstein equations whose frequencies bifurcate from linear eigenfrequencies of AdS. [...]
CERN-TH-2017-023; arXiv:1701.07804.-
2017-06-26 - 16 p.
- Published in : Phys. Rev. D 95 (2017) 124043
Fulltext: 10.1103_PhysRevD.95.124043 - PDF; arXiv:1701.07804 - PDF;
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2017-03-30
07:24 |
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2017-03-30
07:24 |
Standard Model Parton Distributions at Very High Energies
/ Bauer, Christian W. (LBNL, Berkeley ; CERN) ; Ferland, Nicolas (LBNL, Berkeley) ; Webber, Bryan R. (Cambridge U.)
We compute the leading-order evolution of parton distribution functions for all the Standard Model fermions and bosons up to energy scales far above the electroweak scale, where electroweak symmetry is restored. Our results include the 52 PDFs of the unpolarized proton, evolving according to the SU(3), SU(2), U(1), mixed SU(2) x U(1) and Yukawa interactions. [...]
CAVENDISH-HEP-17-03; CERN-TH-2017-067; arXiv:1703.08562.-
2017-08-09 - 31 p.
- Published in : JHEP 08 (2017) 036
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2017-03-30
07:24 |
Spontaneous symmetry breaking in three-Higgs-doublet $S_3$-symmetric models
/ Emmanuel-Costa, D. (Lisbon, CFTP ; Lisbon, IST) ; Ogreid, O.M. (U. Bergen (main)) ; Osland, P. (Bergen U.) ; Rebelo, M.N. (Lisbon, CFTP ; Lisbon, IST ; CERN)
The talk summarises work done by the authors consisting of a detailed study of the possible vacua in models with three Higgs doublets with $S_3$ symmetry and without explicit CP violation. Different vacua require special regions of the parameter space which were analysed in our work. [...]
CERN-TH-2017-070; arXiv:1703.08457.-
2017-07-27 - 11 p.
- Published in : J. Phys. : Conf. Ser. 873 (2017) 012007
Preprint: PDF;
In : 5th Symposium on Prospects in the Physics of Discrete Symmetries, Warsaw, Poland, 28 Nov - 3 Dec 2016, pp.012007
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2017-03-30
07:23 |
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