Unleashing the full power of LHCb to probe Stealth New Physics

Borsato, Martino; Vidal, Xabier Cid; Tsai, Yuhsin; Sierra, Carlos Vázquez; Zurita, José; Alonso-Álvarez, Gonzalo; Boyarsky, Alexey; Rodríguez, Alexandre Brea; Franzosi, Diogo Buarque; Cacciapaglia, Giacomo; Vidal, Adrián Casais; Du, Mingxuan; Elor, Gilly; Escudero, Miguel; Ferretti, Gabriele; Flacke, Thomas; Foldenauer, Patrick; Hajer, Jan; Henry, Louis; Ilten, Philip; Kamenik, Jernej; Jashal, Brij Kishor; Knapen, Simon; Redi, Federico Leo; Low, Matthew; Liu, Zuowei; Campos, Arantza Oyanguren; Polycarpo, Erica; Ramos, Maria; Pernas, Miguel Ramos; Salvioni, Ennio; Rangel, Murilo Santana; Schäfer, Ruth; Sestini, Lorenzo; Soreq, Yotam; Tran, Van Que; Timiryasov, Inar; van Veghel, Maarten; Westhoff, Susanne; Williams, Michael; Zupan, Jure

doi:10.48550/arxiv.2105.12668

Cited by 5 publications

(5 citation statements)

References 284 publications

(460 reference statements)

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“…For this reason in the first exploration we focus on π → µ + µ − decays, which result in striking displaced vertices (DVs) at the LHC and a narrow resonance peak that can be exploited to suppress the combinatorial and misidentification backgrounds [82]. 18 The sensitivity of LHCb to dark shower signals is well established [14,82] (see also a recent overview [83]) and the most recent search for dimuon resonances [84] has already provided a HV interpretation. Building on these results, in section 6.1 we perform a detailed recast to set current bounds and estimate the future reach of LHCb on our Z-initiated, muon-rich dark shower signals.…”

Section: Z-initiated Muon-rich Dark Showers At the Lhcmentioning

confidence: 99%

A theory of dark pions

Cheng

Salvioni

2022

J. High Energ. Phys.

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We present a complete model of a dark QCD sector with light dark pions, broadly motivated by hidden naturalness arguments. The dark quarks couple to the Standard Model via irrelevant Z- and Higgs-portal operators, which encode the low-energy effects of TeV-scale fermions interacting through Yukawa couplings with the Higgs field. The dark pions, depending on their CP properties, behave as either composite axion-like particles (ALPs) mixing with the Z or scalars mixing with the Higgs. The dark pion lifetimes fall naturally in the most interesting region for present and proposed searches for long-lived particles, at the LHC and beyond. This is demonstrated by studying in detail three benchmark scenarios for the symmetries and structure of the theory. Within a coherent framework, we analyze and compare the GeV-scale signatures of flavor-changing meson decays to dark pions, the weak-scale decays of Z and Higgs bosons to hidden hadrons, and the TeV-scale signals of the ultraviolet theory. New constraints are derived from B decays at CMS and from Z-initiated dark showers at LHCb, focusing on the displaced dimuon signature. We also emphasize the strong potential sensitivity of ATLAS and CMS to dark shower signals with large multiplicities and long lifetimes of the dark pions. As a key part of our phenomenological study, we perform a new data-driven calculation of the decays of a light ALP to exclusive hadronic Standard Model final states. The results are provided in a general form, applicable to any model with arbitrary flavor-diagonal couplings of the ALP to fermions.

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Section: Z-initiated Muon-rich Dark Showers At the Lhcmentioning

confidence: 99%

A theory of dark pions

Cheng

Salvioni

2022

J. High Energ. Phys.

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“…Such signatures could be accessible with new experimental strategies, cf. the recent effort to uncover stealth physics by the LHCb collaboration [665], or the CERN open data portal, discussed below.…”

Section: Earth-emergent Eev Eventsmentioning

confidence: 99%

Unveiling hidden physics at the LHC

et al. 2022

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The field of particle physics is at the crossroads. The discovery of a Higgs-like boson completed the Standard Model (SM), but the lacking observation of convincing resonances Beyond the SM (BSM) offers no guidance for the future of particle physics. On the other hand, the motivation for New Physics has not diminished and is, in fact, reinforced by several striking anomalous results in many experiments. Here we summarise the status of the most significant anomalies, including the most recent results for the flavour anomalies, the multi-lepton anomalies at the LHC, the Higgs-like excess at around 96 GeV, and anomalies in neutrino physics, astrophysics, cosmology, and cosmic rays. While the LHC promises up to 4 $$\hbox {ab}^{-1}$$ ab - 1 of integrated luminosity and far-reaching physics programmes to unveil BSM physics, we consider the possibility that the latter could be tested with present data, but that systemic shortcomings of the experiments and their search strategies may preclude their discovery for several reasons, including: final states consisting in soft particles only, associated production processes, QCD-like final states, close-by SM resonances, and SUSY scenarios where no missing energy is produced. New search strategies could help to unveil the hidden BSM signatures, devised by making use of the CERN open data as a new testing ground. We discuss the CERN open data with its policies, challenges, and potential usefulness for the community. We showcase the example of the CMS collaboration, which is the only collaboration regularly releasing some of its data. We find it important to stress that individuals using public data for their own research does not imply competition with experimental efforts, but rather provides unique opportunities to give guidance for further BSM searches by the collaborations. Wide access to open data is paramount to fully exploit the LHCs potential.

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“…[11]. Note that other studies have addressed the sensitivity of the LHCb experiment (or other B-factories) to similar or related theoretical setups [12][13][14][15]. Interestingly, when the scalar sector is non-minimal, final states with a larger number of muons can be expected since the decay of the heaviest a 2 → a 1 a 1 is typically more common than a 2 → µ + µ − .…”

Section: Introductionmentioning

confidence: 99%

Following the muon track of hierarchical sectors at LHCb

Vidal,

Mombächer,

Ramos

et al. 2022

Preprint

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This paper reports a study of the experimental signatures of hierarchical sectors beyond the Standard Model characterized by a flavor-violating heavy vector and a set of light pseudo-Goldstone bosons a 1,2 , spanning a large range of lifetimes. The non-minimal scalar spectrum triggers novel B decays into multiple leptons that would have escaped the reach of current searches. Novel displaced vertex analyses at LHCb are therefore discussed to probe the hierarchical new physics, extending the scope of the tracking system of the detector. Additionally, the reach of the proposed CODEX-b experiment is studied as well. By exploiting the use of tracks only reconstructed in subsystems of the detector at the high-level LHCb trigger, B(B 0 s → a 1 a 2 ) < 10 −8 and B(B + → K + a 1 a 2 ) < 10 −9 could be reached in the muon channel across seven orders of magnitude in the lifetime of the Goldstone bosons. Correspondingly, heavy-light particle couplings of order 1 could be tested, potentially ruling out composite Higgs scenarios where the heavy and light sectors couple strongly.

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Unleashing the full power of LHCb to probe Stealth New Physics

Cited by 5 publications

References 284 publications

A theory of dark pions

A theory of dark pions

Unveiling hidden physics at the LHC

Following the muon track of hierarchical sectors at LHCb

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