2020-07-04
04:03 |
Stellar Signatures of Inhomogeneous Big Bang Nucleosynthesis
/ Arbey, Alexandre (IP2I, Lyon ; CERN ; IUF, Paris) ; Auffinger, Jérémy (IP2I, Lyon) ; Silk, Joseph (Paris, Inst. Astrophys. ; Johns Hopkins U. ; Oxford U.)
We evaluate abundance anomalies generated in patches of the universe where the baryon-to-photon ratio was locally enhanced by possibly many orders of magnitude in the range $\eta = 10^{-10} - 10^{-1}$. Our study is motivated by the possible survival of rare dense regions in the early universe, the most extreme of which, above a critical threshold, collapsed to form primordial black holes. [...]
arXiv:2006.02446; CERN-TH-2020-067.-
2020-07-01 - 9 p.
- Published in : Phys. Rev. D 102 (2020) 023503
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2020-04-29
05:48 |
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2020-04-25
04:01 |
Prospects of searches for long-lived charged particles with MoEDAL
/ Acharya, B.S. (King's Coll. London (main) ; ICTP, Trieste) ; De Roeck, A. (CERN ; Antwerp U.) ; Ellis, J. (King's Coll. London ; CERN ; NICPB, Tallinn) ; Ghosh, D.K. (IACS, Kolkata) ; Masełek, R. (Warsaw U.) ; Panizzo, G. (ICTP, Trieste ; INFN, Trieste) ; Pinfold, J.L. (Alberta U.) ; Sakurai, K. (Warsaw U.) ; Shaa, A. (Warsaw U.) ; Wall, A. (Alabama U.)
We study the prospects of searches for exotic long-lived particles with the MoEDAL detector at the LHC, assuming the integrated luminosity of 30 fb$^{-1}$ that is expected at the end of Run 3. MoEDAL incorporates nuclear track detectors deployed a few metres away from the interaction point, which are sensitive to any highly-ionizing particles. [...]
arXiv:2004.11305; KCL-PH-TH/2020-18; CERN-TH-2020-060.-
2020-06-25 - 20 p.
- Published in : Eur. Phys. J. C 80 (2020) 572
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2020-03-28
21:20 |
Constraints on Standard Model Constructions in F-theory
/ Cvetic, Mirjam (Pennsylvania U. ; Maribor U.) ; Halverson, James (Northeastern U.) ; Lin, Ling (CERN) ; Long, Cody (Northeastern U. ; Cornell U., Phys. Dept.)
We argue that the following three statements cannot all be true: (i) our vacuum is a type IIB / F-theory vacuum at moderate-to-large $h^{1,1}$, (ii) the $\alpha'$-expansion is controlled via the supergravity approximation, à la the KKLT and LVS scenarios, and (iii) there are no additional gauged sectors from seven-branes. Since nearly all known globally consistent F-theory models with the exact chiral spectrum of the Standard Model and gauge coupling unification occur at moderate $h^{1,1}$, this finding calls for new moduli stabilization scenarios or/and a rich seven-brane dark sector..
arXiv:2004.00630; CERN-TH-2020-049; UPR-1304-T; UPR-1304-T.-
Geneva : CERN, 2020-07-10 - 10 p.
- Published in : Phys. Rev. D 102 (2020) 026012
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2020-03-20
04:36 |
Bottom quark mass effects in associated $WH$ production with $H \to b\bar{b}$ decay through NNLO QCD
/ Behring, Arnd (KIT, Karlsruhe) ; Bizoń, Wojciech (Karlsruhe U., ITP ; KIT, Karlsruhe) ; Caola, Fabrizio (Oxford U., Theor. Phys.) ; Melnikov, Kirill (Karlsruhe U., ITP) ; Röntsch, Raoul (CERN)
We present a computation of NNLO QCD corrections to the production of a Higgs boson in association with a $W$ boson at the LHC followed by the decay of the Higgs boson to a $b\bar{b}$ pair. At variance with previous NNLO QCD studies of the same process, we treat $b$ quarks as massive. [...]
arXiv:2003.08321; TTP20-011; P3H-20-009; CERN-TH-2020-043.-
2020-06-17 - 16 p.
- Published in : Phys. Rev. D 101 (2020) 114012
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2020-03-17
04:39 |
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2020-03-12
04:46 |
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2020-03-10
04:43 |
Proton Decay: Flipped vs Unflipped SU(5)
/ Ellis, John (King's Coll. London ; CERN ; NICPB, Tallinn) ; Garcia, Marcos A.G. (Madrid, IFT) ; Nagata, Natsumi (Tokyo U. ; HARC, Woodlands ; Athens Academy) ; Nanopoulos, Dimitri V. (Texas A-M ; HARC, Woodlands ; Athens Academy) ; Olive, Keith A. (Minnesota U., Theor. Phys. Inst.)
We analyze nucleon decay modes in a no-scale supersymmetric flipped SU(5) GUT model, and contrast them with the predictions for proton decays via dimension-6 operators in a standard unflipped supersymmetric SU(5) GUT model. We find that these GUT models make very different predictions for the ratios $\Gamma(p \to \pi^0 \mu^+)/\Gamma(p \to \pi^0 e^+)$, $\Gamma(p \to \pi^+ \bar{\nu})/\Gamma(p \to \pi^0 e^+)$, $\Gamma(p \to K^0 e^+)/\Gamma(p \to \pi^0 e^+)$ and $\Gamma(p \to K^0 \mu^+)/\Gamma(p \to \pi^0 \mu^+)$, and that predictions for the ratios $\Gamma(p \to \pi^0 \mu^+)/\Gamma(p \to \pi^0 e^+)$ and $\Gamma(p \to \pi^+ \bar{\nu})/\Gamma(p \to \pi^0 e^+)$ also differ in variants of the flipped SU(5) model with normal- or inverse-ordered light neutrino masses. [...]
arXiv:2003.03285; KCL-PH-TH/2020-10; CERN-TH-2020-031; UT-20-03; ACT-01-20; MI-TH-206, UMN-TH-3914/20; FTPI-MINN-20/04; IFT-UAM/CSIC-20-36.-
2020-05-06 - 25 p.
- Published in : JHEP 2005 (2020) 021
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2020-03-10
04:42 |
Higgs-Pair Production via Gluon Fusion at Hadron Colliders: NLO QCD Corrections
/ Baglio, J. (CERN) ; Campanario, F. (Valencia U., IFIC ; KIT, Karlsruhe, TP) ; Glaus, S. (KIT, Karlsruhe, TP ; KIT, Karlsruhe) ; Mühlleitner, M. (KIT, Karlsruhe, TP) ; Ronca, J. (Valencia U., IFIC) ; Spira, M. (PSI, Villigen) ; Streicher, J. (Tubingen U.)
Higgs-pair production via gluon fusion is the dominant production mechanism of Higgs-boson pairs at hadron colliders. In this work, we present details of our numerical determination of the full next-to-leading-order (NLO) QCD corrections to the leading top-quark loops. [...]
arXiv:2003.03227; CERN-TH-2020-032; IFIC/20-06; FTUV-20-0301; KA-TP-01-2020, PSI-PR-20-03; KA-TP-01-2020,
PSI-PR-20-03.-
2020-04-28 - 51 p.
- Published in : JHEP 2004 (2020) 181
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2020-02-27
04:40 |
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