Solutions to R-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.svg"><mml:msub><mml:mrow><mml:mi>R</mml:mi></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>D</mml:mi></mml:mrow><mml:mrow><mml:mo>⁎</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:msub></mml:math> in light of Belle 2019 data

We study the effective field theory sensitivity of an LHC analysis for the τν final state with an associated b-jet. To illustrate the improvement due to the b-tagging, we first recast the recent CMS analysis in the τν channel, using an integrated luminosity of 35.9 fb−1 at $$ \sqrt{s} $$ s = 13 TeV, and provide limits on all the dimension-six effective operators which contribute to the process. The expected limits from the b-tagged analysis are then derived and compared. We find an improvement of approximately ∼ 30% in the bounds for operators with a b quark. We also discuss in detail possible angular observables to be used as a discriminator between dimension-six operators with different Lorentz structure. Finally, we study the impact of these limits on some simplified scenarios aimed at addressing the observed deviations from the Standard Model in lepton flavor universality ratios of semileptonic B-meson decays. In particular, we compare the collider limits on those scenarios set by our analysis either with or without the b-tagging, assuming an integrated luminosity of 300 fb−1, with relevant low-energy flavor measurements.

show abstract

“…See for example refs. [42][43][44][45][46] for updated EFT fits of R(D ( * ) ) and related observables.…”

Section: Jhep12(2020)035mentioning

confidence: 99%

Bottom-flavored mono-tau tails at the LHC

Marzocca

Min

Son

2020

J. High Energ. Phys.

View full text Add to dashboard Cite

show abstract

“…To get rid of this difficulty PMNS matrix is specifically chosen as given in Eq. (11). This has been discussed in detail in [25].…”

Section: Non Standard Interaction In Neutrino Oscillationmentioning

confidence: 93%

“…These include hints of Lepton Flavour Universality (LFU) violation in the decays induced by the charged current quark level transition b → clν (l = e, μ, τ ) [1] as well as in the neutral current b → s l + l − (l = e, μ) [2,3] decays. The preferred Lorentz a e-mail: sarkar.2@iitj.ac.in b e-mail: dixit.1@iitj.ac.in (corresponding author) structure(s) of the possible new physics [4][5][6][7][8][9][10][11][12] can be realized through several extensions of the SM.…”

Section: Introductionmentioning

confidence: 99%

Effects of nonstandard interaction on temporal and spatial correlations in neutrino oscillations

Sarkar

Dixit

2021

Eur. Phys. J. C

View full text Add to dashboard Cite

Effects of physics beyond the standard model in the neutrino sector are conveniently incorporated through non-standard interaction parameters. Assuming new physics in the form of dimension-6 vector operators, a recent global analysis of neutrino oscillation data including results from COHERENT experiment suggests two favourable new physics scenarios. These are LMA-Light (with normal mass ordering) and LMA-Dark (with inverted mass ordering) sectors of parameters. In this work, we study the effects of new physics solutions on Leggett–Garg-type (LGtI) inequality which quantifies temporal correlations in the system along with flavour entropy and genuine tripartite entanglement which can be considered as measures of spatial correlations. We show that the violation of LGtI for $$\nu _{\mu }$$ ν μ energy around 3 GeV in the DUNE experimental set-up can not only be an indication of presence of new physics but such a new physics is expected to be in the form of LMA-Dark sector with inverted ordering. Further, we show that the LMA-Light solution, in general, decreases the values of all measures of quantum correlations in comparison to their SM predictions. On the other hand, the Dark solution can significantly enhance the values of these measures.

show abstract

“…A broader discussion on B-physics anomalies should also include the LUV information stemming from another class of rare B decays, namely b → c semileptonic transitions [60][61][62][63]. Indeed, a combined resolution of R K ( * ) anomalies with the long-standing deviations observed in R D ( * ) ≡ Br(B → D ( * ) τ ν)/Br(B → D ( * ) ν) originally found at Babar [64] and subsequently measured at Belle [65] and LHCb [66], has triggered a lot of interest in the theory community.…”

Section: Jhep12(2020)016mentioning

confidence: 99%

B anomalies under the lens of electroweak precision

Alasfar

Azatov

Blas

et al. 2020

J. High Energ. Phys.

View full text Add to dashboard Cite

The measurements carried out at LEP and SLC projected us into the precision era of electroweak physics. This has also been relevant in the theoretical interpretation of LHCb and Belle measurements of rare B semileptonic decays, paving the road for new physics with the inference of lepton universality violation in $$ {R}_{K^{\left(\ast \right)}} $$ R K ∗ ratios. The simplest explanation of these flavour anomalies — sizeable one-loop contributions respecting Minimal Flavour Violation — is currently disfavoured by electroweak precision data. In this work, we discuss how to completely relieve the present tension between electroweak constraints and one-loop minimal flavour violating solutions to $$ {R}_{K^{\left(\ast \right)}} $$ R K ∗ . We determine the correlations in the Standard Model Effective Field Theory that highlight the existence of such a possibility. Then, we consider minimal extensions of the Standard Model where our effective-field-theory picture can be realized. We discuss how these solutions to b → sℓℓ anomalies, respecting electroweak precision and without any new source of flavour violation, may point to the existence of a Z′ boson at around the TeV scale, within the discovery potential of LHC, or to leptoquark scenarios.

show abstract

Solutions to R-RD⁎ in light of Belle 2019 data

Cited by 40 publications

References 18 publications

Bottom-flavored mono-tau tails at the LHC

Bottom-flavored mono-tau tails at the LHC

Effects of nonstandard interaction on temporal and spatial correlations in neutrino oscillations

B anomalies under the lens of electroweak precision

Contact Info

Product

Resources

About