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Small instanton-induced flavor invariants and the axion potential
/ Bedi, Ravneet (Minnesota U.) ; Gherghetta, Tony (Minnesota U.) ; Grojean, Christophe (DESY ; Humboldt U., Berlin ; CERN) ; Guedes, Guilherme (DESY) ; Kley, Jonathan (DESY ; Humboldt U., Berlin) ; Vuong, Pham Ngoc Hoa (DESY)
Small instantons which increase the axion mass due to an appropriate modification of QCD at a UV scale $\Lambda_{\rm SI}$, can also enhance the effect of CP-violating operators to shift the axion potential minimum by an amount, $\theta_{\rm ind}$, proportional to the flavorful couplings in the SMEFT. Since physical observables must be flavor basis independent, we construct a basis of determinant-like flavor invariants that arise from instanton calculations containing the effects of dimension-six CP-odd operators at the scale $\require{cancel}\Lambda_{\cancel{\rm CP}}$. [...]
arXiv:2402.09361; CERN-TH-2024-022; DESY-24-019; HU-EP-24/05; UMN--TH--4313/24.-
2024-06-24 - 49 p.
- Published in : JHEP 2406 (2024) 156
Fulltext: document - PDF; 2402.09361 - PDF;
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The flavor invariants of the $\nu$SM
/ Grojean, Christophe (DESY ; Humboldt U., Berlin ; CERN) ; Kley, Jonathan (DESY ; Humboldt U., Berlin) ; Leflot, Damien (Annecy, LAPTH) ; Yao, Chang-Yuan (DESY ; Nankai U.)
Sixty years after the experimental discovery of CP violation in the quark sector, the existence of a similar CP violation in the lepton sector is still to be established. Actually, the structure of such a violation depends crucially on the origin of the neutrino masses. [...]
arXiv:2406.00094; CERN-TH-2024-076; DESY-24-021; HU-EP-24/14.-
2024-12-10 - 60 p.
- Published in : JHEP 2412 (2024) 069
Fulltext: 2406.00094 - PDF; document - PDF;
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ALP-ine quests at the LHC: hunting axion-like particles via peaks and dips in $t \bar{t}$ production
/ Anuar, Afiq (CERN) ; Biekötter, Anke (Mainz U., Inst. Phys. ; U. Mainz, PRISMA) ; Biekötter, Thomas (KIT, Karlsruhe, TP) ; Grohsjean, Alexander (Hamburg U.) ; Heinemeyer, Sven (Madrid, IFT) ; Jeppe, Laurids (DESY) ; Schwanenberger, Christian (Hamburg U. ; DESY) ; Weiglein, Georg (DESY ; Hamburg U., Inst. Theor. Phys. II)
We present an analysis of the sensitivity of current and future LHC searches for new spin-0 particles in top-anti-top-quark ($t\bar{t}$) final states, focusing on generic axion-like particles (ALPs) that are coupled to top quarks and gluons. As a first step, we derive new limits on the effective ALP Lagrangian in terms of the Wilson coefficients $c_t$ and $c_{\tilde{G}}$ based on the results of the CMS search using $35.9$ fb$^{-1}$ of data, collected at $\sqrt{s} = 13$ TeV. [...]
arXiv:2404.19014; DESY-24-059; IFT--UAM/CSIC-24-042; IFT-UAM/CSIC-24-042; KA-TP-06-2024; MITP-24-044.-
2024-12-27 - 35 p.
Fulltext: 2404.19014 - PDF; document - PDF;
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ALPs, the on-shell way
/ Bertuzzo, Enrico (Sao Paulo U. ; Modena U.) ; Grojean, Christophe (DESY ; Humboldt U., Berlin ; CERN) ; Salla, Gabriel M. (Sao Paulo U. ; DESY)
We study how the coupling between axion-like particles (ALPs) and matter can be obtained at the level of on-shell scattering amplitudes. We identify three conditions that allow us to compute amplitudes that correspond to shift-symmetric Lagrangians, at the level of operators with dimension 5 or higher, and we discuss how they relate and extend the Adler's zero condition. [...]
arXiv:2311.16253; CERN-TH-2023-202; DESY-23-090; HU-EP-23/21.-
2024-05-15 - 50 p.
- Published in : JHEP 2405 (2024) 175
Fulltext: 2311.16253 - PDF; document - PDF;
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EUTelescope: A modular reconstruction framework for beam telescope data
/ Bisanz, Tobias (Gottingen U., II. Phys. Inst. ; CERN) ; Jansen, Hendrik (DESY) ; Arling, Jan-Hendrik (DESY) ; Bulgheroni, Antonio (Insubria U., Como) ; Dreyling-Eschweiler, Jan (DESY) ; Eichhorn, Thomas (DESY) ; Gregor, Ingrid-Maria (DESY) ; Hamnett, Phlillip (DESY) ; Kleinwort, Claus (DESY) ; Morton, Alexander (DESY) et al.
EUTelescope is a modular, comprehensive software framework for the reconstruction of particle trajectories recorded with beam telescopes. Its modularity allows for a flexible usage of processors each fulfilling separate tasks of the reconstruction chain such as clustering, alignment and track fitting. [...]
arXiv:2011.10356.-
2020-09-15 - 25 p.
- Published in : JINST 15 (2020) P09020
Fulltext: PDF;
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Towards a Muon Collider
/ Accettura, Carlotta (CERN) ; Adams, Dean (Rutherford) ; Agarwal, Rohit (UC, Berkeley (main)) ; Ahdida, Claudia (CERN) ; Aimè, Chiara (Pavia U. ; INFN, Pavia) ; Amapane, Nicola (INFN, Turin ; Turin U.) ; Amorim, David (CERN) ; Andreetto, Paolo (INFN, Padua) ; Anulli, Fabio (INFN, Rome) ; Appleby, Robert (Manchester U.) et al.
A muon collider would enable the big jump ahead in energy reach that is needed for a fruitful exploration of fundamental interactions. The challenges of producing muon collisions at high luminosity and 10 TeV centre of mass energy are being investigated by the recently-formed International Muon Collider Collaboration. [...]
arXiv:2303.08533; FERMILAB-PUB-23-123-AD-PPD-T.-
2023-09-26 - 118 p.
- Published in : Eur. Phys. J. C
- Published in : Eur. Phys. J. C
Fulltext: 2303.08533 - PDF; FERMILAB-PUB-23-123-AD-PPD-T - PDF; Fulltext from Publisher: PDF; External links: JLab Document Server; Fermilab Library Server
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