Collider Signals of Baryogenesis and Dark Matter from $B$ Mesons: A Roadmap to Discovery

Alonso-Álvarez, Gonzalo; Elor, Gilly; Escudero, Miguel

doi:10.48550/arxiv.2101.02706

Cited by 7 publications

(25 citation statements)

References 126 publications

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“…where 0 ≤ α d,s ≤ 1.4 are temperature-dependent functions that peak at a temperature T R ∼ 15 MeV, see [176]. As discussed above, the asymmetry is directly related to the semileptonic asymmetries in the neutral B meson systems and the exotic decay of B mesons into a final state with a single SM baryon and missing energy.…”

Section: Cosmological Dynamics and Particle Physics Modelmentioning

confidence: 91%

“…The two most characteristic features of B-Mesogenesis are: i) a large positive enhancement of the semileptonic-leptonic asymmetries in neutral B meson decays, and ii) the presence of a partially invisible and seemingly baryon number-violating decay mode of b-flavoured hadrons with a branching fraction > 10 −4 . As is thoroughly investigated in [176], existing collider experiments will be able to conclusively assess the viability of this paradigm.…”

Section: Dark Matter and Baryogenesismentioning

confidence: 99%

“…These are assumed to originate from the decay of a inflatonlike or modulus scalar field Φ with a mass M Φ 11 GeV. If the b quarks are produced [174], see also [176]).…”

Section: Cosmological Dynamics and Particle Physics Modelmentioning

confidence: 99%

“…where u and d are right handed quarks in the mass basis which may come in any flavor combination. Collider constraints [176,178,179] on colored scalars force the mass of Y to be at least greater than M Y > 1.2 TeV, and so it can be integrated out generating the four-fermion effective operator in Eq. ( 16).…”

Section: Cosmological Dynamics and Particle Physics Modelmentioning

confidence: 99%

“…15 is an inclusive rate containing contributions from all possible channels. At present, the current bound on such inclusive branching fraction is 10 % and arises from inclusive measurements of B meson decays [176,185]. However, to date no searches on exclusive channels such as B → ψ + B have been performed.…”

Section: Exotic B-flavored Hadron Decaysmentioning

confidence: 99%

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Unleashing the full power of LHCb to probe Stealth New Physics

Borsato,

Vidal,

Tsai

et al. 2021

Preprint

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In this paper, we describe the potential of the LHCb experiment to detect Stealth physics. This refers to dynamics beyond the Standard Model that would elude searches that focus on energetic objects or precision measurements of known processes. Stealth signatures include long-lived particles and light resonances that are produced very rarely or together with overwhelming backgrounds. We will discuss why LHCb is equipped to discover this kind of physics at the Large Hadron Collider and provide examples of well-motivated theoretical models that can be probed with great detail at the experiment.

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Section: Cosmological Dynamics and Particle Physics Modelmentioning

confidence: 91%

Section: Dark Matter and Baryogenesismentioning

confidence: 99%

“…These are assumed to originate from the decay of a inflatonlike or modulus scalar field Φ with a mass M Φ 11 GeV. If the b quarks are produced [174], see also [176]).…”

Section: Cosmological Dynamics and Particle Physics Modelmentioning

confidence: 99%

Section: Cosmological Dynamics and Particle Physics Modelmentioning

confidence: 99%

Section: Exotic B-flavored Hadron Decaysmentioning

confidence: 99%

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Unleashing the full power of LHCb to probe Stealth New Physics

Borsato,

Vidal,

Tsai

et al. 2021

Preprint

Self Cite

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Disintegration of beauty: a precision study

Lenz

Laura

Rusov

2023

J. High Energ. Phys.

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We update the Standard Model (SM) predictions for B-meson lifetimes within the heavy quark expansion (HQE). Including for the first time the contribution of the Darwin operator, SU(3)F breaking corrections to the matrix element of dimension-six four-quark operators and the so-called eye-contractions, we obtain for the total widths $$ \Gamma \left({B}^{+}\right)=\left({0.58}_{-0.07}^{+0.11}\right){\textrm{ps}}^{-1},\Gamma \left({B}_d\right)=\left({0.63}_{-0.07}^{+0.11}\right){\textrm{ps}}^{-1},\Gamma \left({B}_s\right)=\left({0.63}_{-0.07}^{+0.11}\right){\textrm{ps}}^{-1} $$ Γ B + = 0.58 − 0.07 + 0.11 ps − 1 , Γ B d = 0.63 − 0.07 + 0.11 ps − 1 , Γ B s = 0.63 − 0.07 + 0.11 ps − 1 , and for the lifetime ratios τ(B+)/τ(Bd) = 1.086 ± 0.022, τ(Bs)/τ(Bd) = 1.003 ± 0.006 (1.028 ± 0.011). The two values for the last observable arise from using two different sets of input for the non-perturbative parameters $$ {\mu}_{\pi}^2\left({B}_d\right),{\mu}_G^2\left({B}_d\right) $$ μ π 2 B d , μ G 2 B d , and $$ {\rho}_D^3\left({B}_d\right) $$ ρ D 3 B d as well as from different estimates of the SU(3)F breaking in these parameters. Our results are overall in very good agreement with the corresponding experimental data, however, there seems to emerge a tension in τ(Bs)/τ(Bd) when considering the second set of input parameters. Specifically, this observable is extremely sensitive to the size of the parameter $$ {\rho}_D^3\left({B}_d\right) $$ ρ D 3 B d and of the SU(3)F breaking effects in $$ {\mu}_{\pi}^2,{\mu}_G^2 $$ μ π 2 , μ G 2 and $$ {\rho}_D^3 $$ ρ D 3 ; hence, it is of utmost importance to be able to better constrain all these parameters. In this respect, an extraction of $$ {\mu}_{\pi}^2\left({B}_s\right),{\mu}_G^2\left({B}_s\right),{\rho}_D^3\left({B}_s\right) $$ μ π 2 B s , μ G 2 B s , ρ D 3 B s from future experimental data on inclusive semileptonic Bs-meson decays or from direct non-perturbative calculations, as well as more insights about the value of $$ {\rho}_D^3(B) $$ ρ D 3 B extracted from fits to inclusive semileptonic B-decays, would be very helpful in reducing the corresponding theory uncertainties.

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Probing R-parity violation in B-meson decays to a baryon and a light neutralino

Dib

Helo

Lyubovitskij

et al. 2023

J. High Energ. Phys.

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We propose a search for B meson decays to a baryon plus missing energy at the Belle II experiment to probe supersymmetry with a GeV-scale lightest neutralino $$ {\overset{\sim }{\chi}}_1^0 $$ χ ~ 1 0 and R-parity violation (RPV). We perform analytic computations of the signal branching fractions in the framework of effective field theory, with a single nonzero RPV operator $$ {\lambda}_{ij3}^{\prime \prime }{\overline{U}}_i^c{\overline{D}}_j^c{\overline{D}}_3^c $$ λ ij 3 ′ ′ U ¯ i c D ¯ j c D ¯ 3 c , where i, j = 1, 2. The hadronic form factors are calculated using an SU(3) phenomenological Lagrangian approach for the proton, as well as several hyperons and charmed baryons. Since the decay of the neutralino is kinematically and CKM suppressed in this theoretical scenario, it decays outside the detector and appears experimentally only as missing energy. We detail the analysis techniques at the experimental level and estimate the background in the $$ {B}^{+}\to p{\overset{\sim }{\chi}}_1^0 $$ B + → p χ ~ 1 0 search using published results for $$ {B}^{+}\to {K}^{+}\nu \overline{\nu} $$ B + → K + ν ν ¯ . Our final sensitivity plots are shown for both $$ {\lambda}_{113}^{\prime \prime } $$ λ 113 ′ ′ versus the squark mass $$ {m}_{\tilde{q}} $$ m q ~ and $$ {\lambda}_{113}^{\prime \prime }/{m}_{\tilde{q}}^2 $$ λ 113 ′ ′ / m q ~ 2 versus the neutralino mass $$ {m}_{{\overset{\sim }{\chi}}_1^0} $$ m χ ~ 1 0 . We find that the search at Belle II could probe $$ {\lambda}_{113}^{\prime \prime }/{m}_{\tilde{q}}^2 $$ λ 113 ′ ′ / m q ~ 2 down to the order of 10−8 GeV−2 in the kinematically allowed $$ {m}_{{\overset{\sim }{\chi}}_1^0} $$ m χ ~ 1 0 range. We also obtain current limits on $$ {\lambda}_{123}^{\prime \prime } $$ λ 123 ′ ′ by recasting an existing search interpreted as $$ {B}^0\to {\Lambda}^0{\overset{\sim }{\chi}}_1^0 $$ B 0 → Λ 0 χ ~ 1 0 , and comment about searches for $$ {B}^{+}\to {\Sigma}^{+}{\overset{\sim }{\chi}}_1^0 $$ B + → Σ + χ ~ 1 0 , $$ {B}^0\to {\Sigma}^0{\chi}_1^0 $$ B 0 → Σ 0 χ 1 0 , $$ {B}^{+}\to {\Lambda}_c^{+}{\overset{\sim }{\chi}}_1^0 $$ B + → Λ c + χ ~ 1 0 , and $$ {B}^{+}\to {\Xi}_c^{+}{\overset{\sim }{\chi}}_1^0 $$ B + → Ξ c + χ ~ 1 0 . In closing, we briefly discuss potential searches at the LHCb and BESIII experiments.

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Collider Signals of Baryogenesis and Dark Matter from $B$ Mesons: A Roadmap to Discovery

Cited by 7 publications

References 126 publications

Unleashing the full power of LHCb to probe Stealth New Physics

Unleashing the full power of LHCb to probe Stealth New Physics

Disintegration of beauty: a precision study

Probing R-parity violation in B-meson decays to a baryon and a light neutralino

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