Maximizing the impact of new physics in 
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 anomalies

Asadi, Pouya; Shih, David

doi:10.1103/physrevd.100.115013

Cited by 25 publications

(17 citation statements)

References 65 publications

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“…In particular, NP in the l ¼ τ channel may yield violations of lepton flavor universality (LFU), while NP in the l ¼ e, μ channels can both produce LFU deviations and potentially contribute to the inclusive vs exclusive tensions. The τ case has been extensively investigated due to the fact that BSM models explaining the RðD ðÃÞ Þ anomalies by modifying semitauonic processes are less constrained by other measurements [50][51][52][53][54][55][56][57]. On the other hand, BSM contributions in the e, μ channels have received less attention [58][59][60][61][62][63].…”

Section: B If Np Contributes To Semileptonic B Decaymentioning

confidence: 99%

New physics in B meson mixing: Future sensitivity and limitations

et al. 2020

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The mixing of neutral mesons is sensitive to some of the highest scales probed in laboratory experiments. In light of the planned LHCb Upgrade II, a possible upgrade of Belle II, and the broad interest in flavor physics in the tera-Z phase of the proposed FCC-ee program, we study constraints on new physics contributions to B d and B s mixings which can be obtained in these benchmark scenarios. We explore the limitations of this program, and identify the measurement of jV cb j as one of the key ingredients in which progress beyond current expectations is necessary to maximize future sensitivity. We speculate on possible solutions to this bottleneck. Given the current tension with the standard model (SM) in semileptonic B decays, we explore how its resolution may impact the search for new physics in mixing. Even if new physics has the same Cabibbo-Kobayashi-Maskawa and loop suppressions of flavor changing processes as the SM, the sensitivity will reach 2 TeV, and it can be much higher if any SM suppressions are lifted. We illustrate the discovery potential of this program.

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Section: B If Np Contributes To Semileptonic B Decaymentioning

confidence: 99%

New physics in B meson mixing: Future sensitivity and limitations

et al. 2020

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“…the new Belle measurements, see Refs. [33][34][35][36][37]) 1 . On the other hand, particular NP scenarios such as: charged scalars [46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62], leptoquarks (both scalar and vector) , extra gauge bosons [47,94,[98][99][100][101][102][103][104][105][106][107][108][109][110][111], right-handed neutrinos [62,[106][107][108][109][110][111][112][113], R-parity violating (RPV) supersymmetric couplings [31,[114][115]…”

Section: Introductionmentioning

confidence: 99%

Charged current b→cτν¯τ anomalies in a general W′ boson scenario

2019

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The very recent experimental information obtained from Belle experiment, along with the one accumulated by the BABAR and LHCb experiments have shown the existence of anomalies in the ratios R(D) and R(D * ) associated with the charged current transition b → cτντ . Although the Belle measurements are in agreement with the SM predictions, the new experimental world averages still exhibit a tension. In addition, the D * longitudinal polarization FL(D * ) related with the channel B → D * τντ observed by the Belle and the ratio R(J/ψ) measured by the LHCb also show discrepancies with their corresponding SM estimations. In this work, we present a modelindependent study based on the most general effective Lagrangian that yields to a tree-level effective contribution to the transition b → cτντ induced by a general W gauge boson. Instead of considering any specific new physics (NP) realization, we performed an analysis by considering all the different chiral charges to the charm-bottom and τ -ντ interaction terms with a charged W boson that explain the anomalies. We present a phenomenological study of parameter space allowed by the new experimental b → cτντ data and with the mono-tau signature pp → τ h X + MET at the LHC. For comparison, we include some of the W boson NP realizations that have already been studied in the literature.

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“…Many NP analyses and global fits to the R(D ( * ) ) measurements -together with other potentially template-sensitive observables, including q 2 spectra -have been carried out by a range of phenomenological studies (see, e.g., Refs. [27][28][29][30][31][32][33][34][35][36][37][38][39]). As mentioned above, the standard practice has been to fit NP predictions to the world-average values of R(D ( * ) ) (and other data) to determine confidence levels for allowed and excluded NP couplings.…”

Section: R(d ( * ) ) Biases From New Physics Truthmentioning

confidence: 99%

Das ist der HAMMER: consistent new physics interpretations of semileptonic decays

et al. 2020

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Precise measurements of $$b\rightarrow c\tau \bar{\nu }$$ b → c τ ν ¯ decays require large resource-intensive Monte Carlo (MC) samples, which incorporate detailed simulations of detector responses and physics backgrounds. Extracted parameters may be highly sensitive to the underlying theoretical models used in the MC generation. Because new physics (NP) can alter decay distributions and acceptances, the standard practice of fitting NP Wilson coefficients to SM-based measurements of the $$R(D^{(*)})$$ R ( D ( ∗ ) ) ratios can be biased. The newly developed software tool enables efficient reweighting of MC samples to arbitrary NP scenarios or to any hadronic matrix elements. We demonstrate how allows avoidance of biases through self-consistent fits directly to the NP Wilson coefficients. We also present example analyses that demonstrate the sizeable biases that can otherwise occur from naive NP interpretations of SM-based measurements. The library is presently interfaced with several existing experimental analysis frameworks and we provide an overview of its structure.

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Maximizing the impact of new physics in b→cτν anomalies

Cited by 25 publications

References 65 publications

New physics in B meson mixing: Future sensitivity and limitations

New physics in B meson mixing: Future sensitivity and limitations

Charged current b→cτν¯τ anomalies in a general W′ boson scenario

Das ist der HAMMER: consistent new physics interpretations of semileptonic decays

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