Test of lepton flavor universality by the measurement of the 
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 branching fraction using three-prong 
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Aaij, R.; Adeva, B.; Adinolfi, M.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; Alessio, F.; Alexander, M.; Albero, A. Alfonso; Ali, S.; Alkhazov, G.; Cartelle, P. Alvarez; Alves, A. A.; Amato, S.; Amerio, S.; Amhis, Y.; An, L.; Anderlini, L.; Andreassi, G.; Andreotti, M.; Andrews, J. E.; Appleby, R. B.; Archilli, F.; d’Argent, P.; Romeu, J. Arnau; Артамонов, А.; Artuso, M.; Aslanides, E.; Auriemma, G.; Baalouch, M.; Babuschkin, I.; Bachmann, S.; Back, J. J.; Badalov, A.; Baesso, C.; Baker, S.; Balagura, V.; Baldini, W.; Baranov, A.; Barlow, R. J.; Barschel, C.; Barsuk, S.; Barter, W.; Baryshnikov, F.; Batozskaya, V.; Battista, V.; Bay, A.; Beaucourt, L.; Beddow, J.; Bedeschi, F.; Bediaga, I.; Beiter, A.; Bel, L. J.; Beliy, N.; Bellée, V.; Belloli, N.; Belous, K.; Belyaev, I.; Ben-Haim, E.; Bencivenni, G.; Benson, S.; Beranek, S.; Berezhnoy, A.; Bernet, R.; Berninghoff, D.; Bertholet, E.; Bertolin, A.; Betancourt, C.; Betti, F.; Bettler, M. 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doi:10.1103/physrevd.97.072013

Cited by 329 publications

(304 citation statements)

References 52 publications

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“…The SM calculations for these ratios, performed by several groups [5][6][7][8], are averaged by HFLAV [9] to obtain R(D) = 0.299 ± 0.003 and R(D * ) = 0.258 ± 0.005. Semitauonic B decays were first observed by Belle in 2007 [10], with subsequent studies reported by Belle [11][12][13][14], BaBar [15], and LHCb [16,17]. The average values of the experimental results, excluding the result presented in this Letter, are R(D) = 0.407 ± 0.039 ± 0.024 and R(D * ) = 0.306 ± 0.013 ± 0.007 [9], where the first uncertainty is statistical and the second is systematic.…”

mentioning

confidence: 86%

Measurement of R(D) and R(D*) wi

Caria¹,

Urquijo²,

Adachi³

et al. 2020

Phys. Rev. Lett.

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103

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We report a measurement of the ratios of branching fractions R(D, where denotes an electron or a muon. The results are based on a data sample containing 772 × 10 6 B B events recorded at the Υ(4S) resonance with the Belle detector at the KEKB e + e − collider. The tag-side B meson is reconstructed in a semileptonic decay mode, and the signal-side τ is reconstructed in a purely leptonic decay. The results are R(D) = 0.307 ± 0.037 ± 0.016 and R(D * ) = 0.283 ± 0.018 ± 0.014, where the first uncertainties are statistical and the second are systematic. These results are in agreement with the Standard Model predictions within 0.2 and 1.1 standard deviations, respectively.

show abstract

mentioning

confidence: 86%

Measurement of R(D) and R(D*) wi

Caria¹,

Urquijo²,

Adachi³

et al. 2020

Phys. Rev. Lett.

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147

103

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show abstract

“…Σ cos ∆φ ≡ cos(∆φ( , / E T )) + cos(∆φ(τ had , / E T )), (15) discriminates against background events containing leptonically decaying W bosons. Here ∆φ( , / E T ) is the azimuthal angle between the and the / E T and ∆φ(τ had , / E T ) is the azimuthal angle between the τ had and the / E T .…”

Section: Tt Candidate Event Selection Criteriamentioning

confidence: 99%

“…Systematic uncertainties due to hadronic effects largely cancel in these ratios. A combination [5] of the results from the BaBar [6,7], Belle [8,9,10,11,12], and LHCb [13, 14,15] experiments yields the results:…”

Section: Introductionmentioning

confidence: 99%

A self-calibrating, double-ratio method to test tau lepton universality in W boson decays at the LHC

Dysch

Wyatt

2020

Eur. Phys. J. C

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Measurements in W + W − events at LEP2 and in B hadron semileptonic decays at B factories and LHCb provide intriguing hints of a violation of lepton universality in the charged current coupling of tau leptons relative to those for electrons and muons. We propose a novel, self-calibrating method to test tau lepton universality in W boson decays at the LHC. We compare directly the ratio of the numbers of selected τ had and eµ final states in di-leptonic tt events with that in Z/γ * → τ + τ − events. Here = e or µ and τ had is a candidate semi-hadronic tau decay. This "double-ratio" cancels to first order sensitivity to systematic uncertainties on the reconstruction of e, µ, and τ leptons, thus improving very significantly the precision to which tau lepton universality can be tested in W boson decay branching ratios at the LHC. Using particle-level Monte Carlo events, and a parameterised simulation of detector performance, we demonstrate the effectiveness of the method and estimate the most significant residual sources of uncertainty arising from experimental and phenomenological systematics. Our studies indicate that a single experiment precision on the tau lepton universality test of around 1.4% is achievable with a data set of L dt = 140 fb −1 at √ s = 13 TeV. This would improve significantly upon the precision of 2.5% on the four-experiment combined LEP2 measurements. If the central value of the proposed new measurement were equal to the central value of the LEP2 measurement this would yield an observation of BSM physics at a significance level of around 5σ.

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“…In our proposed approach, we use the fact that the momentum of the partially reconstructed B 0 s meson can be determined from the position of its decay vertex, assuming that the mass of the invisible state is known. Similar topological reconstruction has been used in studies of semileptonic decays at LHCb [9]. With the correctly determined B 0 s momentum, the decay time distribution will exhibit oscillations with a known frequency.…”

Section: Introductionmentioning

confidence: 97%

Oscillations of $$ {B}_s^0 $$ Mesons as a Probe of Decays with Unreconstructed Particles

Poluektov

Morris

2020

J. High Energ. Phys.

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A new experimental technique to study the decays of B 0 s mesons into the final states involving unreconstructable particles is proposed. The method uses a characteristic feature of fast flavour oscillations of B 0 s mesons. Analysis of the oscillation spectrum of partially reconstructed flavour-tagged B 0 s decays provides information about the mass spectrum of invisible states in these decays and removes any background which does not come from the decays of B 0 s mesons.

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Test of lepton flavor universality by the measurement of the B0→D*−τ+ντ branching fraction using three-prong
R. Aaij¹,
B. Adeva²,
M. Adinolfi³
et al.

Abstract: Test of lepton flavor universality by the measurement of the B 0 → D Ã − τ + ν τ branching fraction using three-prong τ decays R. Aaij et al.

Cited by 329 publications

References 52 publications

Measurement of R(D) and R(D*) wi

Measurement of R(D) and R(D*) wi

A self-calibrating, double-ratio method to test tau lepton universality in W boson decays at the LHC

Oscillations of $$ {B}_s^0 $$ Mesons as a Probe of Decays with Unreconstructed Particles

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Test of lepton flavor universality by the measurement of the B0→D*−τ+ντ branching fraction using three-prong R. Aaij1, B. Adeva2, M. Adinolfi3 et al.

Abstract: Test of lepton flavor universality by the measurement of the B 0 → D Ã − τ + ν τ branching fraction using three-prong τ decays R. Aaij et al.

Cited by 329 publications

References 52 publications

Measurement of R(D) and R(D*) wi

Measurement of R(D) and R(D*) wi

A self-calibrating, double-ratio method to test tau lepton universality in W boson decays at the LHC

Oscillations of $$ {B}_s^0 $$ Mesons as a Probe of Decays with Unreconstructed Particles

Contact Info

Product

Resources

About

Test of lepton flavor universality by the measurement of the B0→D*−τ+ντ branching fraction using three-prong
R. Aaij¹,
B. Adeva²,
M. Adinolfi³
et al.