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Interpreting LHCb's $\Lambda_b\to \Lambda_c\tau\bar\nu$ measurement and puzzles in semileptonic $\Lambda_b$ decays
/ Bernlochner, Florian U. (Bonn U.) ; Ligeti, Zoltan (LBL, Berkeley ; UC, Berkeley) ; Papucci, Michele (Caltech) ; Robinson, Dean J. (LBL, Berkeley ; UC, Berkeley)
Normalizing the recent LHCb measurement of $\Lambda_b \to \Lambda_c \tau \bar\nu$ to the standard model (SM) prediction for the $\Lambda_b \to \Lambda_c \mu \bar\nu$ rate, instead of a LEP measurement, provides a more consistent comparison with the SM prediction for the lepton flavor universality ratio $R(\Lambda_c)$. This modestly increases $R(\Lambda_c)$ compared to the quoted LHCb result, such that it no longer hints at a suppression compared to the SM, which would be hard to accommodate in new physics scenarios that enhance $R(D^{(*)})$. [...]
arXiv:2206.11282; CALT-TH-2022-023.-
2023-01-01 - 3 p.
- Published in : Phys. Rev. D 107 (2023) L011502
Fulltext: 2206.11282 - PDF; Publication - PDF;
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The Road Ahead for CODEX-b
/ Aielli, Giulio (Rome U., Tor Vergata) ; Alimena, Juliette (CERN) ; Beacham, James (Duke U.) ; Ben-Haim, Eli (Paris U., VI-VII) ; Borsato, Martino (Kirchhoff Inst. Phys.) ; Charles, Matthew John (Paris U., VI-VII) ; Vidal, Xabier Cid (Santiago de Compostela U., IGFAE) ; Coco, Victor (CERN) ; De Roeck, Albert (CERN) ; Dey, Biplab (Eotvos Lorand U., Budapest, Inst. Theor. Phys.) et al.
In this Snowmass contribution we present a comprehensive status update on the progress and plans for the proposed CODEX-b detector, intended to search for long-lived particles beyond the Standard Model. [...]
arXiv:2203.07316.
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13 p.
eConf - Fulltext
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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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Physics Beyond Colliders at CERN: Beyond the Standard Model Working Group Report
/ Beacham, J. (Duke U. (main)) ; Burrage, C. (U. Nottingham) ; Curtin, D. (Toronto U.) ; De Roeck, A. (CERN) ; Evans, J. (Cincinnati U.) ; Feng, J.L. (UC, Irvine) ; Gatto, C. (INFN, Naples ; NIU, DeKalb) ; Gninenko, S. (Moscow, INR) ; Hartin, A. (U. Coll. London) ; Irastorza, I. (U. Zaragoza, LFNAE) et al.
The Physics Beyond Colliders initiative is an exploratory study aimed at exploiting the full scientific potential of the CERN’s accelerator complex and scientific infrastructures through projects complementary to the LHC and other possible future colliders. These projects will target fundamental physics questions in modern particle physics. [...]
arXiv:1901.09966; CERN-PBC-REPORT-2018-007.-
Geneva : CERN, 2019-12-11 - 114 p.
- Published in : J. Phys. G 47 (2020) 010501
Full Text: PDF; Fulltext: PDF; Fulltext from publisher: PDF;
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Leveraging the ALICE/L3 cavern for long-lived exotics
/ Gligorov, Vladimir V. (Paris U., VI-VII) ; Knapen, Simon (LBL, Berkeley ; UC, Berkeley ; Princeton, Inst. Advanced Study) ; Nachman, Benjamin (LBL, Berkeley) ; Papucci, Michele (LBL, Berkeley ; UC, Berkeley ; CERN) ; Robinson, Dean J. (LBL, Berkeley ; UC, Santa Cruz)
Run 5 of the HL-LHC era (and beyond) may provide new opportunities to search for physics beyond the standard model (BSM) at interaction point 2 (IP2). In particular, taking advantage of the existing ALICE detector and infrastructure provides an opportunity to search for displaced decays of beyond standard model long-lived particles (LLPs). [...]
arXiv:1810.03636.-
2019-01-17 - 14 p.
- Published in : Phys. Rev. D 99 (2019) 015023
Article from SCOAP3: PDF; Fulltext: PDF;
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Searching for Long-lived Particles: A Compact Detector for Exotics at LHCb
/ Gligorov, Vladimir V. (Paris U., VI-VII) ; Knapen, Simon (LBNL, Berkeley ; UC, Berkeley) ; Papucci, Michele (LBNL, Berkeley ; UC, Berkeley) ; Robinson, Dean J. (Cincinnati U.)
We advocate for the construction of a new detector element at the LHCb experiment, designed to search for displaced decays of beyond standard model long-lived particles, taking advantage of a large shielded space in the LHCb cavern that is expected to soon become available. We discuss the general features and putative capabilities of such an experiment, as well as its various advantages and complementarities with respect to the existing LHC experiments and proposals such as SHiP and MATHUSLA. [...]
arXiv:1708.09395.-
2018-02-01 - 12 p.
- Published in : Phys. Rev. D 97 (2018) 015023
Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from Publisher: PDF;
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HAMMER: Reweighting tool for simulated data samples
/ Duell, Stephan (Bonn U.) ; Bernlochner, Florian (Bonn U.) ; Ligeti, Zoltan (LBL, Berkeley) ; Papucci, Michele (CERN ; LBL, Berkeley) ; Robinson, Dean (UC, Berkeley)
Modern flavour physics experiments, such as Belle II or LHCb, require large samples of generated Monte Carlo events. Monte Carlo events often are processed in a sophisticated chain that includes a simulation of the detector response. [...]
SISSA, 2017 - 6 p.
- Published in : PoS ICHEP2016 (2017) 1074
Fulltext: PDF; External link: PoS server
In : 38th International Conference on High Energy Physics, Chicago, IL, USA, 03 - 10 Aug 2016, pp.1074
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Les Houches 2015: Physics at TeV colliders - new physics working group report
/ Brooijmans, G. (Columbia U.) ; Delaunay, C. (Annecy, LAPTH) ; Delgado, A. (Notre Dame U.) ; Englert, C. (Glasgow U.) ; Falkowski, A. (Orsay, LPT) ; Fuks, B. (Paris, LPTHE) ; Nikitenko, S. (Imperial Coll., London) ; Sekmen, S. (CHEP, Taegu) ; Barducci, D. (Annecy, LAPTH) ; Bernon, J. (LPSC, Grenoble) et al.
We present the activities of the 'New Physics' working group for the 'Physics at TeV Colliders' workshop (Les Houches, France, 1-19 June, 2015). [...]
arXiv:1605.02684.
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2016 - 197.
Preprint - Full text
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Dark Matter Benchmark Models for Early LHC Run-2 Searches: Report of the ATLAS/CMS Dark Matter Forum
/ Abercrombie, Daniel (MIT) ; Akchurin, Nural (Texas Tech.) ; Akilli, Ece (Geneva U.) ; Alcaraz Maestre, Juan (Madrid, CIEMAT) ; Allen, Brandon (MIT) ; Alvarez Gonzalez, Barbara (CERN) ; Andrea, Jeremy (Strasbourg, IPHC) ; Arbey, Alexandre (CERN ; Lyon Observ.) ; Azuelos, Georges (TRIUMF) ; Azzi, Patrizia (INFN, Padua) et al.
This document is the final report of the ATLAS-CMS Dark Matter Forum, a forum organized by the ATLAS and CMS collaborations with the participation of experts on theories of Dark Matter, to select a minimal basis set of dark matter simplified models that should support the design of the early LHC Run-2 searches. A prioritized, compact set of benchmark models is proposed, accompanied by studies of the parameter space of these models and a repository of generator implementations. [...]
arXiv:1507.00966; FERMILAB-PUB-15-282-CD.-
2019-09-13 - 160 p.
- Published in : Phys. Dark Univ. 27 (2020) 100371
Fulltext: 1507.00966 - PDF; arXiv:1507.00966 - PDF; Fulltext from Publisher: PDF; Fulltext from publisher: PDF; External link: Fermilab Library Server (fulltext available)
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