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Lepton-flavor violating axions at MEG II
/ Jho, Yongsoo (Yonsei U. ; CERN) ; Knapen, Simon (UC, Berkeley ; LBNL, Berkeley) ; Redigolo, Diego (CERN ; INFN, Florence)
We study the sensitivity of the existing MEG data to lepton flavor violating axion-like particles produced through $\mu^+ \to e^+ a \gamma$ and estimate the discovery potential for the upcoming MEG II experiment in this channel. The MEG II signal efficiency can be improved significantly if a new trigger can be implemented in a dedicated run with a reduced beam intensity. [...]
arXiv:2203.11222; CERN-TH-2022-044.-
2022-10-05 - 23 p.
- Published in : JHEP 2210 (2022) 029
Fulltext: 2203.11222 - PDF; document - PDF;
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2.
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Looking forward to Lepton-flavor-violating ALPs
/ Calibbi, Lorenzo (Nankai U.) ; Redigolo, Diego (INFN, Florence ; Florence U. ; CERN) ; Ziegler, Robert (Karlsruhe U., ITP) ; Zupan, Jure (Cincinnati U.)
We assess the status of past and future experiments on lepton flavor violating (LFV) muon and tau decays into a light, invisible, axion-like particle (ALP), $a$. We propose a new experimental setup for MEG II, the MEGII-fwd, with a forward calorimeter placed downstream from the muon stopping target. [...]
arXiv:2006.04795; P3H-20-024; TTP20-025.-
2021-09-27 - 62 p.
- Published in : JHEP 2109 (2021) 173
Fulltext: 2006.04795 - PDF; document - PDF; Fulltext from publisher: PDF;
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4.
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Expression of Interest for the CODEX-b Detector
/ Aielli, Giulio (INFN, Rome2 ; Rome U., Tor Vergata) ; Ben-Haim, Eli (Paris U., VI-VII) ; Cardarelli, Roberto (INFN, Rome2) ; Charles, Matthew John (Paris U., VI-VII) ; Cid Vidal, Xabier (Santiago de Compostela U., IGFAE) ; Coco, Victor (CERN) ; Dey, Biplab (CCNU, Wuhan, Inst. Part. Phys.) ; Dumps, Raphael (CERN) ; Evans, Jared A. (Cincinnati U.) ; Gibbons, George (Birmingham U.) et al.
This document presents the physics case and ancillary studies for the proposed CODEX-b long-lived particle (LLP) detector, as well as for a smaller proof-of-concept demonstrator detector, CODEX-$\beta$, to be operated during Run 3 of the LHC. Our development of the CODEX-b physics case synthesizes `top-down' and `bottom-up' theoretical approaches, providing a detailed survey of both minimal and complete models featuring LLPs. [...]
arXiv:1911.00481.-
2020-12-21 - 47 p.
- Published in : Eur. Phys. J. C 80 (2020) 1177
Article from SCOAP3: PDF; Fulltext: PDF;
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5.
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Gravitational Wave and CMB Probes of Axion Kination
/ Co, Raymond T. (Minnesota U., Theor. Phys. Inst.) ; Dunsky, David (UC, Berkeley ; LBL, Berkeley) ; Fernandez, Nicolas (Illinois U., Urbana) ; Ghalsasi, Akshay (Pittsburgh U.) ; Hall, Lawrence J. (UC, Berkeley ; LBL, Berkeley) ; Harigaya, Keisuke (CERN ; Princeton, Inst. Advanced Study) ; Shelton, Jessie (Illinois U., Urbana)
Rotations of an axion field in field space provide a natural origin for an era of kination domination, where the energy density is dominated by the kinetic term of the axion field, preceded by an early era of matter domination. Remarkably, no entropy is produced at the end of matter domination and hence these eras of matter and kination domination may occur even after Big Bang Nucleosynthesis. [...]
arXiv:2108.09299; UMN-TH-4023/21; FTPI-MINN-21-15; CERN-TH-2021-124.-
2022-09-15 - 63 p.
- Published in : JHEP 2209 (2022) 116
Fulltext: document - PDF; 2108.09299 - PDF;
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6.
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Challenges in Semileptonic B Decays
/ Gambino, P. (Turin U. ; INFN, Turin) ; Kronfeld, A.S. (Fermilab) ; Rotondo, M. (Frascati) ; Schwanda, C. (Vienna, OAW) ; Bernlochner, F. (Bonn U.) ; Bharucha, A. (Marseille, CPT) ; Bozzi, C. (INFN, Ferrara) ; Calvi, M. (Milan Bicocca U. ; INFN, Milan Bicocca) ; Cao, L. (Bonn U.) ; Ciezarek, G. (CERN) et al.
Two of the elements of the Cabibbo-Kobayashi-Maskawa quark mixing matrix, $|V_{ub}|$ and $|V_{cb}|$, are extracted from semileptonic B decays. The results of the B factories, analysed in the light of the most recent theoretical calculations, remain puzzling, because for both $|V_{ub}|$ and $|V_{cb}|$ the exclusive and inclusive determinations are in clear tension. [...]
arXiv:2006.07287; FERMILAB-PUB-20-235-T.-
2020-10-19 - 77 p.
- Published in : Eur. Phys. J. C 80 (2020) 966
Article from SCOAP3: PDF; Fulltext: fermilab-pub-20-235-t - PDF; 2006.07287 - PDF; External link: Fermilab Library Server (fulltext available)
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Spontaneous Baryogenesis from Axions with Generic Couplings
/ Domcke, Valerie (DESY ; CERN ; EPFL, Lausanne, LPPC) ; Ema, Yohei (DESY) ; Mukaida, Kyohei (DESY) ; Yamada, Masaki (Tohoku U. (main) ; Tohoku U.)
Axion-like particles can source the baryon asymmetry of our Universe through spontaneous baryogenesis. Here we clarify that this is a generic outcome for essentially any coupling of an axion-like particle to the Standard Model, requiring only a non-zero velocity of the classical axion field while baryon or lepton number violating interactions are present in thermal bath. [...]
arXiv:2006.03148; DESY 20-100; DESY-20-100; CERN-TH-2020-088; TU-1102.-
2020-08-20 - 48 p.
- Published in : JHEP 2008 (2020) 096
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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Workshop summary: Kaons@CERN 2023
/ Anzivino, G. (INFN, Perugia ; Perugia U.) ; Cuendis, Sergio Arguedas (Costa Rica U.) ; Bernard, V. (IJCLab, Orsay) ; Bijnens, J. (Lund U.) ; Bloch-Devaux, B. (Turin U.) ; Bordone, M. (CERN) ; Brizioli, F. (INFN, Perugia ; CERN) ; Brod, J. (Cincinnati U.) ; Camalich, J.M. (IAC, La Laguna ; Laguna U., Tenerife) ; Ceccucci, A. (CERN) et al.
Kaon physics is at a turning point -- while the rare-kaon experiments NA62 and KOTO are in full swing, the end of their lifetime is approaching and the future experimental landscape needs to be defined. With HIKE, KOTO-II and LHCb-Phase-II on the table and under scrutiny, it is a very good moment in time to take stock and contemplate about the opportunities these experiments and theoretical developments provide for particle physics in the coming decade and beyond. [...]
arXiv:2311.02923; CERN-TH-2023-206.-
2024-04-09 - 55 p.
- Published in : Eur. Phys. J. C
Fulltext: 2311.02923 - PDF; document - PDF;
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A Common Tracking Software Project
/ Ai, Xiaocong (DESY) ; Allaire, Corentin (CERN) ; Calace, Noemi (CERN) ; Czirkos, Angéla (Eotvos U.) ; Elsing, Markus (CERN) ; Ene, Irina (UC, Berkeley) ; Farkas, Ralf (Bonn U.) ; Gagnon, Louis-Guillaume (UC, Berkeley) ; Garg, Rocky (Stanford U.) ; Gessinger, Paul (CERN) et al.
The reconstruction of the trajectories of charged particles, or track reconstruction, is a key computational challenge for particle and nuclear physics experiments. While the tuning of track reconstruction algorithms can depend strongly on details of the detector geometry, the algorithms currently in use by experiments share many common features. [...]
arXiv:2106.13593.-
2022-04-13 - 27 p.
- Published in : Comput. Softw. Big Sci. 6 (2022) 8
Fulltext: 2106.13593 - PDF; document - PDF;
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A Heavy QCD Axion and the Mirror World
/ Dunsky, David I. (New York U., CCPP ; UC, Berkeley ; LBL, Berkeley) ; Hall, Lawrence J. (UC, Berkeley ; LBL, Berkeley) ; Harigaya, Keisuke (Chicago U. ; Chicago U., EFI ; Chicago U., KICP ; Tokyo U., IPMU ; CERN)
We study the mirror world with dark matter arising from the thermal freeze-out of the lightest, stable mirror particle -- the mirror electron. The dark matter abundance is achieved for mirror electrons of mass 225 GeV, fixing the mirror electroweak scale near $10^8$ GeV. [...]
arXiv:2302.04274.-
2024-02-27 - 36 p.
- Published in : JHEP 2402 (2024) 212
Fulltext: 2302.04274 - PDF; document - PDF;
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