A. Zallo

*This is an algorithmically generated author record based on publicly available information.

Research Subjects

High Energy Physics

Research Interests

A. Zallo has a total of 236 co-authors. Here are the top co-authors by number of shared publications:

A. Gaz
The Belle II Collaboration)
9 shared publications
A. Hafner
Babar Collaboration
9 shared publications
A. J. S. Smith
University of Kansas, Lawrence, Kansas 66045, USA
9 shared publications
A. M. Lutz
IJCLab Université Paris-Saclay and CNRS/IN2P3 91405 Orsay France
9 shared publications
Aaron Roodman
Stanford University
9 shared publications
Abner Soffer
Tel Aviv University
9 shared publications

Latest Publications

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- 26 March 2026
- Published by American Physical Society (APS) in Physical Review D
Study of χ b 1 , 2 ( 2 P ) → ω ϒ ( 1 S ) transitions in ϒ ( 3 S ) → γ χ b 1 , 2 ( 2 P ) decays at BABAR
by J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, et al.
Results are presented on χ b 1 , 2 ( 2 P ) → ω ϒ ( 1 S ) transitions from e + e − → ϒ ( 3 S ) → γ χ b 1 , 2 ( 2 P ) decays. The data were collected with the detector at the PEP-II asymmetric-energy e + e − collider at SLAC. The integrated luminosity of the data sample is 28.0 fb − 1 , corresponding to 121.3 × 10 6 ϒ ( 3 S ) decays. Signals of χ b 1 , 2 ( 2 P ) are observed over a negligible background. Improved precision measurements of branching fractions are obtained. First measurements of the χ b 1 , 2 ( 2 P ) angular distributions are performed. No evidence is found for the presence of a χ b 0 ( 2 P ) → ω ϒ ( 1 S ) decay mode.
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- 26 March 2026
- Published by American Physical Society (APS) in Physical Review D
Open Access
Study of χ b 1 , 2 ( 2 P ) → ω ϒ ( 1 S ) transitions in ϒ ( 3 S ) → γ χ b 1 , 2 ( 2 P ) decays at BABAR
by J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, et al.
Results are presented on χ b 1 , 2 ( 2 P ) → ω ϒ ( 1 S ) transitions from e + e − → ϒ ( 3 S ) → γ χ b 1 , 2 ( 2 P ) decays. The data were collected with the detector at the PEP-II asymmetric-energy e + e − collider at SLAC. The integrated luminosity of the data sample is 28.0 fb − 1 , corresponding to 121.3 × 10 6 ϒ ( 3 S ) decays. Signals of χ b 1 , 2 ( 2 P ) are observed over a negligible background. Improved precision measurements of branching fractions are obtained. First measurements of the χ b 1 , 2 ( 2 P ) angular distributions are performed. No evidence is found for the presence of a χ b 0 ( 2 P ) → ω ϒ ( 1 S ) decay mode.
Open Access
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Cited by 3
- 10 February 2025
- Published by American Physical Society (APS) in Physical Review D
Search for baryogenesis and dark matter in B + → Λ c + + invisible decays
by J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, et al.
A mechanism of baryogenesis and dark matter production via B meson oscillations and decays has recently been proposed to explain the observed dark matter abundance and matter-antimatter asymmetry in the universe. This mechanism introduces a low-mass dark sector particle ( ψ D ) with a nonzero baryonic charge. We present a search for this new state in B + → Λ c + ψ D decays using data collected at the ϒ ( 4 S ) resonance by the detector at SLAC, corresponding to an integrated luminosity of 431.0 fb − 1 . The search leverages the full reconstruction of the B − meson in ϒ ( 4 S ) → B + B − decays, accompanied by the reconstruction of a Λ c + , to infer the presence of ψ D . No significant signal is observed, and limits on the B + → Λ c + ψ D branching fraction are set at the level of 1.6 × 10 − 4 at 90% confidence level for 0.94 < m ψ D < 2.99 GeV . These results set strong constraints on the parameter space allowed by B -meson baryogenesis.
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- 10 February 2025
- Published by American Physical Society (APS) in Physical Review D
Open Access
Search for baryogenesis and dark matter in B + → Λ c + + invisible decays
by J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, et al.
A mechanism of baryogenesis and dark matter production via B meson oscillations and decays has recently been proposed to explain the observed dark matter abundance and matter-antimatter asymmetry in the universe. This mechanism introduces a low-mass dark sector particle ( ψ D ) with a nonzero baryonic charge. We present a search for this new state in B + → Λ c + ψ D decays using data collected at the ϒ ( 4 S ) resonance by the detector at SLAC, corresponding to an integrated luminosity of 431.0 fb − 1 . The search leverages the full reconstruction of the B − meson in ϒ ( 4 S ) → B + B − decays, accompanied by the reconstruction of a Λ c + , to infer the presence of ψ D . No significant signal is observed, and limits on the B + → Λ c + ψ D branching fraction are set at the level of 1.6 × 10 − 4 at 90% confidence level for 0.94 < m ψ D < 2.99 GeV . These results set strong constraints on the parameter space allowed by B -meson baryogenesis.
Cited by 3
Open Access
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Cited by 12
- 20 August 2024
- Published by American Physical Society (APS) in Physical Review D
Model-independent extraction of form factors and $| V_{c b} |$ in $\bar{B} \to D ℓ^{-} {\bar{ν}}_{ℓ}$ with hadronic tagging at BABAR
by J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, et al.
Using the entire BABAR $ϒ (4 S)$ dataset, the first two-dimensional unbinned angular analysis of the semileptonic decay $\bar{B} \to D ℓ^{-} {\bar{ν}}_{ℓ}$ is performed, employing hadronic reconstruction of the tag-side $B$ meson from $ϒ (4 S) \to B \bar{B}$ . Here, $ℓ$ denotes the light charged leptons $e$ and $μ$ . A novel data-driven signal-background separation procedure with minimal dependence on simulation is developed. This procedure preserves all multidimensional correlations present in the data. The expected $\sin^{2} θ_{ℓ}$ dependence of the differential decay rate in the Standard Model is demonstrated, where $θ_{ℓ}$ is the lepton helicity angle. Including input from the latest lattice QCD calculations and previously available experimental data, the underlying form factors are extracted using both model-independent (BGL) and dependent (CLN) methods. Comparisons with lattice calculations show flavor SU(3) symmetry to be a good approximation in the $B_{(s)} \to D_{(s)}$ sector. Using the BGL results, the CKM matrix element $| V_{c b} | = (41.09 \pm 1.16) \times 10^{- 3}$ and the Standard Model prediction of the lepton-flavor universality violation variable $R (D) = 0.300 \pm 0.004$ , are extracted. The value of $| V_{c b} |$ from $\bar{B} \to D ℓ^{-} {\bar{ν}}_{ℓ}$ tends to be higher than that extracted using $\bar{B} \to D^{*} ℓ^{-} {\bar{ν}}_{ℓ}$ . The Standard Model $R (D)$ calculation is at a $1.97 σ$ tension with the latest HFLAV experimental average.
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- 20 August 2024
- Published by American Physical Society (APS) in Physical Review D
Open Access
Model-independent extraction of form factors and $| V_{c b} |$ in $\bar{B} \to D ℓ^{-} {\bar{ν}}_{ℓ}$ with hadronic tagging at BABAR
by J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, et al.
Using the entire BABAR $ϒ (4 S)$ dataset, the first two-dimensional unbinned angular analysis of the semileptonic decay $\bar{B} \to D ℓ^{-} {\bar{ν}}_{ℓ}$ is performed, employing hadronic reconstruction of the tag-side $B$ meson from $ϒ (4 S) \to B \bar{B}$ . Here, $ℓ$ denotes the light charged leptons $e$ and $μ$ . A novel data-driven signal-background separation procedure with minimal dependence on simulation is developed. This procedure preserves all multidimensional correlations present in the data. The expected $\sin^{2} θ_{ℓ}$ dependence of the differential decay rate in the Standard Model is demonstrated, where $θ_{ℓ}$ is the lepton helicity angle. Including input from the latest lattice QCD calculations and previously available experimental data, the underlying form factors are extracted using both model-independent (BGL) and dependent (CLN) methods. Comparisons with lattice calculations show flavor SU(3) symmetry to be a good approximation in the $B_{(s)} \to D_{(s)}$ sector. Using the BGL results, the CKM matrix element $| V_{c b} | = (41.09 \pm 1.16) \times 10^{- 3}$ and the Standard Model prediction of the lepton-flavor universality violation variable $R (D) = 0.300 \pm 0.004$ , are extracted. The value of $| V_{c b} |$ from $\bar{B} \to D ℓ^{-} {\bar{ν}}_{ℓ}$ tends to be higher than that extracted using $\bar{B} \to D^{*} ℓ^{-} {\bar{ν}}_{ℓ}$ . The Standard Model $R (D)$ calculation is at a $1.97 σ$ tension with the latest HFLAV experimental average.
Cited by 12
Open Access
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Cited by 35
- 21 December 2023
- Published by American Physical Society (APS) in Physical Review D
Measurement of additional radiation in the initial-state-radiation processes $e^{+} e^{-} \to μ^{+} μ^{-} γ$ and $e^{+} e^{-} \to π^{+} π^{-} γ$ at BABAR
by J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, et al.
A dedicated measurement of additional radiation in $e^{+} e^{-} \to μ^{+} μ^{-} γ$ and $e^{+} e^{-} \to π^{+} π^{-} γ$ initial-state-radiation events is presented using the full BABAR data sample. For the first time results are presented at next-to- and next-to-next-to-leading order, with one and two additional photons, respectively, for radiation from the initial and final states. Comparison with predictions from phokhara and afkqed Monte Carlo generators is performed, revealing discrepancies in the one-photon rates and angular distributions for the former. This disagreement has a negligible effect on the BABAR measurement of the $e^{+} e^{-} \to π^{+} π^{-} (γ)$ cross section, but could affect other measurements significantly. This study sheds a new light on the longstanding discrepancy in this channel that affects the theoretical prediction of hadronic vacuum polarization contributions to the muon magnetic moment anomaly.
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- 21 December 2023
- Published by American Physical Society (APS) in Physical Review D
Open Access
Measurement of additional radiation in the initial-state-radiation processes $e^{+} e^{-} \to μ^{+} μ^{-} γ$ and $e^{+} e^{-} \to π^{+} π^{-} γ$ at BABAR
by J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, et al.
A dedicated measurement of additional radiation in $e^{+} e^{-} \to μ^{+} μ^{-} γ$ and $e^{+} e^{-} \to π^{+} π^{-} γ$ initial-state-radiation events is presented using the full BABAR data sample. For the first time results are presented at next-to- and next-to-next-to-leading order, with one and two additional photons, respectively, for radiation from the initial and final states. Comparison with predictions from phokhara and afkqed Monte Carlo generators is performed, revealing discrepancies in the one-photon rates and angular distributions for the former. This disagreement has a negligible effect on the BABAR measurement of the $e^{+} e^{-} \to π^{+} π^{-} (γ)$ cross section, but could affect other measurements significantly. This study sheds a new light on the longstanding discrepancy in this channel that affects the theoretical prediction of hadronic vacuum polarization contributions to the muon magnetic moment anomaly.
Cited by 35
Open Access
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Cited by 22
- 16 November 2023
- Published by American Physical Society (APS) in Physical Review Letters
Search for Evidence of Baryogenesis and Dark Matter in $B^{+} \to ψ_{D} + p$ Decays at BABAR
by J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, et al.
A new dark sector antibaryon, denoted $ψ_{D}$ , could be produced in decays of $B$ mesons. This Letter presents a search for $B^{+} \to ψ_{D} + p$ (and the charge conjugate) decays in $e^{+} e^{-}$ annihilations at 10.58 GeV, using data collected in the BABAR experiment. Data corresponding to an integrated luminosity of $398 {fb}^{- 1}$ are analyzed. No evidence for a signal is observed. Branching fraction upper limits in the range from $10^{- 7} - 10^{- 5}$ are obtained at 90% confidence level for masses of $1.0 < m_{ψ_{D}} < 4.3 GeV / c^{2}$ . The result is also reinterpreted to provide the first limits on a supersymmetric model with $R$ -parity violation and a light neutralino.
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- 16 November 2023
- Published by American Physical Society (APS) in Physical Review Letters
Open Access
Search for Evidence of Baryogenesis and Dark Matter in $B^{+} \to ψ_{D} + p$ Decays at BABAR
by J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, et al.
A new dark sector antibaryon, denoted $ψ_{D}$ , could be produced in decays of $B$ mesons. This Letter presents a search for $B^{+} \to ψ_{D} + p$ (and the charge conjugate) decays in $e^{+} e^{-}$ annihilations at 10.58 GeV, using data collected in the BABAR experiment. Data corresponding to an integrated luminosity of $398 {fb}^{- 1}$ are analyzed. No evidence for a signal is observed. Branching fraction upper limits in the range from $10^{- 7} - 10^{- 5}$ are obtained at 90% confidence level for masses of $1.0 < m_{ψ_{D}} < 4.3 GeV / c^{2}$ . The result is also reinterpreted to provide the first limits on a supersymmetric model with $R$ -parity violation and a light neutralino.
Cited by 22
Open Access
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Cited by 9
- 2 November 2023
- Published by American Physical Society (APS) in Physical Review D
Precision $e^{-}$ beam polarimetry at an $e^{+} e^{-}$ $B$ factory using tau-pair events
by J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, et al.
We present a new technique, “tau polarimetry,” for measuring the longitudinal beam polarization present in an $e^{+} e^{-}$ collider through the analysis of $e^{+} e^{-} \to τ^{+} τ^{-}$ events. By exploiting the sensitivity of $τ$ decay kinematics to the longitudinal polarization of the beams, we demonstrate that the longitudinal polarization can be measured with a 3 per mil systematic uncertainty at the interaction point using a technique that is independent of spin and beam transport modeling. Using $424.2 \pm 1.8 {fb}^{- 1}$ of BABAR data at $\sqrt{s} = 10.58 GeV$ , the average longitudinal polarization of the PEP-II $e^{+} e^{-}$ collider has been measured to be $⟨ P ⟩ = 0.0035 \pm 0.002 4_{stat} \pm 0.002 9_{sys}$ . The systematic uncertainty studies are described in detail, which can serve as a guide for future applications of tau polarimetry. A proposed $e^{-}$ beam longitudinal polarization upgrade to the SuperKEKB $e^{+} e^{-}$ collider would benefit from this technique.
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- 2 November 2023
- Published by American Physical Society (APS) in Physical Review D
Open Access
Precision $e^{-}$ beam polarimetry at an $e^{+} e^{-}$ $B$ factory using tau-pair events
by J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, et al.
We present a new technique, “tau polarimetry,” for measuring the longitudinal beam polarization present in an $e^{+} e^{-}$ collider through the analysis of $e^{+} e^{-} \to τ^{+} τ^{-}$ events. By exploiting the sensitivity of $τ$ decay kinematics to the longitudinal polarization of the beams, we demonstrate that the longitudinal polarization can be measured with a 3 per mil systematic uncertainty at the interaction point using a technique that is independent of spin and beam transport modeling. Using $424.2 \pm 1.8 {fb}^{- 1}$ of BABAR data at $\sqrt{s} = 10.58 GeV$ , the average longitudinal polarization of the PEP-II $e^{+} e^{-}$ collider has been measured to be $⟨ P ⟩ = 0.0035 \pm 0.002 4_{stat} \pm 0.002 9_{sys}$ . The systematic uncertainty studies are described in detail, which can serve as a guide for future applications of tau polarimetry. A proposed $e^{-}$ beam longitudinal polarization upgrade to the SuperKEKB $e^{+} e^{-}$ collider would benefit from this technique.
Cited by 9
Open Access
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Cited by 32
- 3 May 2023
- Published by American Physical Society (APS) in Physical Review D
Search for $B$ mesogenesis at BaBar
by J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, et al.
A new mechanism has been proposed to simultaneously explain the presence of dark matter and the matter-antimatter asymmetry in the Universe. This scenario predicts exotic $B$ -meson decays into a baryon and a dark-sector antibaryon ( $ψ_{D}$ ) with branching fractions accessible at $B$ factories. We present a search for $B \to Λ ψ_{D}$ decays using data collected by the BABAR experiment at SLAC. This reaction is identified by fully reconstructing the accompanying $B$ meson and requiring the presence of a single $Λ$ baryon in the remaining particles. No significant signal is observed, and bounds on the $B \to Λ ψ_{D}$ branching fraction are derived in the range $0.13 - 5.2 \times 10^{- 5}$ for $1.0 < m_{ψ_{D}} < 4.2 GeV / c^{2}$ . These results set strong constraints on the parameter space allowed by the theory.
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- 3 May 2023
- Published by American Physical Society (APS) in Physical Review D
Open Access
Search for $B$ mesogenesis at BaBar
by J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, et al.
A new mechanism has been proposed to simultaneously explain the presence of dark matter and the matter-antimatter asymmetry in the Universe. This scenario predicts exotic $B$ -meson decays into a baryon and a dark-sector antibaryon ( $ψ_{D}$ ) with branching fractions accessible at $B$ factories. We present a search for $B \to Λ ψ_{D}$ decays using data collected by the BABAR experiment at SLAC. This reaction is identified by fully reconstructing the accompanying $B$ meson and requiring the presence of a single $Λ$ baryon in the remaining particles. No significant signal is observed, and bounds on the $B \to Λ ψ_{D}$ branching fraction are derived in the range $0.13 - 5.2 \times 10^{- 5}$ for $1.0 < m_{ψ_{D}} < 4.2 GeV / c^{2}$ . These results set strong constraints on the parameter space allowed by the theory.
Cited by 32
Open Access
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Cited by 20
- 4 April 2023
- Published by American Physical Society (APS) in Physical Review D
Study of the reactions $e^{+} e^{-} \to K^{+} K^{-} π^{0} π^{0} π^{0}$ , $e^{+} e^{-} \to K_{S}^{0} K^{\pm} π^{\mp} π^{0} π^{0}$ , and $e^{+} e^{-} \to K_{S}^{0} K^{\pm} π^{\mp} π^{+} π^{-}$ at center-of-mass energies from threshold to 4.5 GeV using initial-state radiation
by J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, et al.
We study the processes $e^{+} e^{-} \to K^{+} K^{-} π^{0} π^{0} π^{0} γ$ , $K_{S}^{0} K^{\pm} π^{\mp} π^{0} π^{0} γ$ , and $K_{S}^{0} K^{\pm} π^{\mp} π^{+} π^{-} γ$ in which an energetic photon is radiated from the initial state. The data were collected with the BABAR detector at the SLAC National Accelerator Laboratory. About 1200, 2600, and 6000 events, respectively, are selected from a data sample corresponding to an integrated luminosity of $469 {fb}^{- 1}$ . The invariant mass of the hadronic final state defines the effective $e^{+} e^{-}$ center-of-mass energy. The center-of-mass energies range from threshold to 4.5 GeV. From the mass spectra, the first ever measurements of the $e^{+} e^{-} \to K^{+} K^{-} π^{0} π^{0} π^{0}$ , $e^{+} e^{-} \to K_{S}^{0} K^{\pm} π^{\mp} π^{0} π^{0}$ , and $e^{+} e^{-} \to K_{S}^{0} K^{\pm} π^{\mp} π^{+} π^{-}$ cross sections are performed. The contributions from the intermediate states that include $η$ , $ϕ$ , $ρ$ , $K^{*} (892)$ , and other resonances are presented. We observe the $J / ψ$ and $ψ (2 S)$ in most of these final states and measure the corresponding branching fractions, many of them for the first time.
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- 4 April 2023
- Published by American Physical Society (APS) in Physical Review D
Open Access
Study of the reactions $e^{+} e^{-} \to K^{+} K^{-} π^{0} π^{0} π^{0}$ , $e^{+} e^{-} \to K_{S}^{0} K^{\pm} π^{\mp} π^{0} π^{0}$ , and $e^{+} e^{-} \to K_{S}^{0} K^{\pm} π^{\mp} π^{+} π^{-}$ at center-of-mass energies from threshold to 4.5 GeV using initial-state radiation
by J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, et al.
We study the processes $e^{+} e^{-} \to K^{+} K^{-} π^{0} π^{0} π^{0} γ$ , $K_{S}^{0} K^{\pm} π^{\mp} π^{0} π^{0} γ$ , and $K_{S}^{0} K^{\pm} π^{\mp} π^{+} π^{-} γ$ in which an energetic photon is radiated from the initial state. The data were collected with the BABAR detector at the SLAC National Accelerator Laboratory. About 1200, 2600, and 6000 events, respectively, are selected from a data sample corresponding to an integrated luminosity of $469 {fb}^{- 1}$ . The invariant mass of the hadronic final state defines the effective $e^{+} e^{-}$ center-of-mass energy. The center-of-mass energies range from threshold to 4.5 GeV. From the mass spectra, the first ever measurements of the $e^{+} e^{-} \to K^{+} K^{-} π^{0} π^{0} π^{0}$ , $e^{+} e^{-} \to K_{S}^{0} K^{\pm} π^{\mp} π^{0} π^{0}$ , and $e^{+} e^{-} \to K_{S}^{0} K^{\pm} π^{\mp} π^{+} π^{-}$ cross sections are performed. The contributions from the intermediate states that include $η$ , $ϕ$ , $ρ$ , $K^{*} (892)$ , and other resonances are presented. We observe the $J / ψ$ and $ψ (2 S)$ in most of these final states and measure the corresponding branching fractions, many of them for the first time.
Cited by 20
Open Access
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Cited by 29
- 23 March 2023
- Published by American Physical Society (APS) in Physical Review D
Search for heavy neutral leptons using tau lepton decays at BaBaR
by J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, et al.
This article presents a model-independent search for an additional, mostly sterile, heavy neutral lepton (HNL), that is capable of mixing with the Standard Model $τ$ neutrino with a mixing strength of $| U_{τ 4} |^{2}$ , corresponding to the absolute square of the extended Pontecorvo-Maki-Nakagawa-Sakata matrix element. Data from the BABAR experiment, with a total integrated luminosity of $424 {fb}^{- 1}$ , are analyzed using a kinematic approach that makes no assumptions on the model behind the origins of the HNL, its lifetime or decay modes. No significant signal is found. Upper limits on $| U_{τ 4} |^{2}$ at the 95% confidence level, depend on the HNL mass hypothesis and vary from $2.31 \times 10^{- 2}$ to $5.04 \times 10^{- 6}$ (with all uncertainties considered), across the mass range $100 < m_{4} < 1300 MeV / c^{2}$ ; the more stringent limits being placed at higher masses.
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- 23 March 2023
- Published by American Physical Society (APS) in Physical Review D
Open Access
Search for heavy neutral leptons using tau lepton decays at BaBaR
by J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, et al.
This article presents a model-independent search for an additional, mostly sterile, heavy neutral lepton (HNL), that is capable of mixing with the Standard Model $τ$ neutrino with a mixing strength of $| U_{τ 4} |^{2}$ , corresponding to the absolute square of the extended Pontecorvo-Maki-Nakagawa-Sakata matrix element. Data from the BABAR experiment, with a total integrated luminosity of $424 {fb}^{- 1}$ , are analyzed using a kinematic approach that makes no assumptions on the model behind the origins of the HNL, its lifetime or decay modes. No significant signal is found. Upper limits on $| U_{τ 4} |^{2}$ at the 95% confidence level, depend on the HNL mass hypothesis and vary from $2.31 \times 10^{- 2}$ to $5.04 \times 10^{- 6}$ (with all uncertainties considered), across the mass range $100 < m_{4} < 1300 MeV / c^{2}$ ; the more stringent limits being placed at higher masses.
Cited by 29

A. Zallo

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Research Interests

A. Zallo has a total of 236 co-authors. Here are the top co-authors by number of shared publications:

Latest Publications

Study of χ b 1 , 2 ( 2 P ) → ω ϒ ( 1 S ) transitions in ϒ ( 3 S ) → γ χ b 1 , 2 ( 2 P ) decays at BABAR

Study of χ b 1 , 2 ( 2 P ) → ω ϒ ( 1 S ) transitions in ϒ ( 3 S ) → γ χ b 1 , 2 ( 2 P ) decays at BABAR

Search for baryogenesis and dark matter in B + → Λ c + + invisible decays

Search for baryogenesis and dark matter in B + → Λ c + + invisible decays

Model-independent extraction of form factors and $| V_{c b} |$ in $\bar{B} \to D ℓ^{-} {\bar{ν}}_{ℓ}$ with hadronic tagging at BABAR

Model-independent extraction of form factors and $| V_{c b} |$ in $\bar{B} \to D ℓ^{-} {\bar{ν}}_{ℓ}$ with hadronic tagging at BABAR

Measurement of additional radiation in the initial-state-radiation processes $e^{+} e^{-} \to μ^{+} μ^{-} γ$ and $e^{+} e^{-} \to π^{+} π^{-} γ$ at BABAR

Measurement of additional radiation in the initial-state-radiation processes $e^{+} e^{-} \to μ^{+} μ^{-} γ$ and $e^{+} e^{-} \to π^{+} π^{-} γ$ at BABAR

Search for Evidence of Baryogenesis and Dark Matter in $B^{+} \to ψ_{D} + p$ Decays at BABAR

Search for Evidence of Baryogenesis and Dark Matter in $B^{+} \to ψ_{D} + p$ Decays at BABAR

Precision $e^{-}$ beam polarimetry at an $e^{+} e^{-}$ $B$ factory using tau-pair events

Precision $e^{-}$ beam polarimetry at an $e^{+} e^{-}$ $B$ factory using tau-pair events

Search for $B$ mesogenesis at BaBar

Search for $B$ mesogenesis at BaBar

Study of the reactions $e^{+} e^{-} \to K^{+} K^{-} π^{0} π^{0} π^{0}$ , $e^{+} e^{-} \to K_{S}^{0} K^{\pm} π^{\mp} π^{0} π^{0}$ , and $e^{+} e^{-} \to K_{S}^{0} K^{\pm} π^{\mp} π^{+} π^{-}$ at center-of-mass energies from threshold to 4.5 GeV using initial-state radiation

Study of the reactions $e^{+} e^{-} \to K^{+} K^{-} π^{0} π^{0} π^{0}$ , $e^{+} e^{-} \to K_{S}^{0} K^{\pm} π^{\mp} π^{0} π^{0}$ , and $e^{+} e^{-} \to K_{S}^{0} K^{\pm} π^{\mp} π^{+} π^{-}$ at center-of-mass energies from threshold to 4.5 GeV using initial-state radiation

Search for heavy neutral leptons using tau lepton decays at BaBaR

Search for heavy neutral leptons using tau lepton decays at BaBaR