L. Sehgal

activity

19942012

most citedLepton Polarization in the Decays

B \to X_{s} μ^{+} μ^{-}

and

B \to X_{s} τ^{+} τ^{-}

251 citations · 1.1k across the 42 of their papers we have counts for

collaborators

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42 papers · 1 filter

hep-ph2012★ 1 cited

Flow of entropy in the evolution of the B^0 anti B^0 system: Upper bound on CP violation from unidirectionality

Ch. Berger, L. M. Sehgal

We have previously studied the time-dependence of a B anti B meson mixture in terms of its density matrix. The requirement that the absolute value of the Stokes vector zeta(t) shou…

hep-ph2010★ 7 cited

An upper limit on CP violation in the $B_{s}^{0} - B ˉ_{s}^{0}$ system

Ch. Berger, L. M. Sehgal

In a previous publication we noted that the time dependence of an incoherent $B^{0} - B ˉ^{0}$ mixture undergoes a qualitative change when the magnitude of CP violation $δ$ exceeds a…

hep-ph2008★ 122 cited

PCAC and coherent pion production by low energy neutrinos

Ch. Berger, L. M. Sehgal

Coherent pi^+ and pi^0 production in low energy neutrino reactions is discussed in the framework of the partially conserved axial vector current theory (PCAC). The role of lepton m…

hep-ph2007

Understanding the Forward Muon Deficit in Coherent Pion Production

L. M. Sehgal

For any inelastic process $v_{ℓ} + I \to ℓ^{-} + F$ with $m_{ℓ} = 0$ , the cross section at $θ_{ℓ} = 0$ is given by Adler's PCAC theorem. Inclusion of the lepton mass has…

hep-ph2007★ 133 cited

Lepton Mass Effects in Single Pion Production by Neutrinos

Ch. Berger, L. M. Sehgal

We reconsider the Feynman-Kislinger-Ravndal model applied to neutrino-excitation of baryon resonances. The effects of lepton mass are included, using the formalism of Kuzmin, Lyubu…

hep-ph2007★ 10 cited

CP Violation and Arrows of Time Evolution of a Neutral $K$ or $B$ Meson from an Incoherent to a Coherent State

Ch. Berger, L. Sehgal

We study the evolution of a neutral $K$ meson prepared as an incoherent equal mixture of $K^{0}$ and $K^{0} ˉ$ . Denoting the density matrix by $ρ(t) = {1/2} N(t) [\1 + \vecζ(t) \cd…

hep-ph2006★ 80 cited

PCAC and the Deficit of Forward Muons in pi^+ Production by Neutrinos

D. Rein, L. M. Sehgal

The K2K experiment, using a fine-grained detector in a neutrino beam of energy $< E >\sim 1.3 GeV$ has observed two-track events that can be interpreted as a coherent react…

hep-ph2004

Rare Decays as Window to New Physics

L. M. Sehgal

Rare decays of K mesons are reviewed from the perspective of testing the ``ones'' and ``zeros'' of the standard model. Decays K^+ -> pi^+ nu anti-nu and K_L -> pi^0 nu anti-nu prob…

hep-ph2004★ 2 cited

CP Violation in the Decays B -> K Kbar in the Presence of D Dbar <-> K Kbar Mixing

S. Barshay, L. M. Sehgal, J. van Leusen

We have recently shown that the large direct CP violation observed in the decay B^0 -> pi^+ pi^-, and the enhanced branching ratio for B^0 -> pi^0 pi^0, can be understood by invoki…

hep-ph2004★ 7 cited

Wrong-Helicity Electrons in Radiative Muon Decay

V. S. Schulz, L. M. Sehgal

We have studied in detail the spectrum of the decay mu^- -> e^- anti-nu_e nu_mu gamma as a function of the electron helicity, and verify the prediction of Sehgal (Phys.Lett. B569,…

hep-ph2004★ 6 cited

Direct CP Violation in B-+ -> pi-+ omega, pi-+ rho0, pi0 rho-+, and in B-bar0(B0) -> pi-+ rho+- With an Enhanced Branching Ratio for pi0 rho0

Saul Barshay, Georg Kreyerhoff, Lalit M. Sehgal

We present a novel dynamics for generating sizable CP-violating asymmetries in the decays of charged $B^{\mp} \to π^{\mp} ω, π^{\mp} ρ^{0}, π^{0} ρ^{\mp}$ , and in $B^{0} ˉ (B^{0}) \to π^{\mp} ρ^{\pm}$ . T…

hep-ph2004★ 6 cited

Stokes Vector of Photon in the Decays B^0 -> rho^0 gamma and B^0 -> K^* gamma

L. M. Sehgal, J. van Leusen

We consider a model for the decay Bbar^0 -> rho^0 gamma in which the short-distance amplitude determined by the Hamiltonian describing b -> d gamma is combined with a typical long-…

hep-ph2004★ 12 cited

Large Direct CP Violation in B^0 -> pi^+ pi^- and an Enhanced Branching Ratio for B^0 -> pi^0 pi^0

S. Barshay, L. M. Sehgal, J. van Leusen

Recent measurements of B^0 -> pi pi decays reveal two features that are in conflict with conventional calculations: the channel B^0 (Bbar^0) -> pi^+ pi^- shows a large direct CP-vi…

hep-ph2003★ 9 cited

Right-handed Electrons in Radiative Muon Decay

L. M. Sehgal

Electrons emitted in the radiative decay mu^- -> e^- anti-nu_e nu_mu gamma have a significant probability of being right-handed, even in the limit m_e -> 0. Such ``wrong-helicity''…

hep-ph2003★ 13 cited

Electroweak Effects in the Double Dalitz Decay $B_{s} \to l^{+} l^{-} l^{' +} l^{' -}$

Yusuf Dincer, L. M. Sehgal

We investigate the double Dalitz decays $B_{s} \to l^{+} l^{-} l^{' +} l^{' -}$ on the basis of the effective Hamiltonian for the transition $b s ˉ \to l^{+} l^{-}$ , and universal form factors…

hep-ph2002

Interference of Conversion and Bremsstrahlung Amplitudes in the Decay K_L -> mu^+ mu^- gamma

P. Poulose, L. M. Sehgal

In the region of large mu^+ mu^- invariant mass, the decay spectrum of K_L -> mu^+ mu^- gamma deviates from the Dalitz pair spectrum, as a result of interference between conversion…

hep-ph2002★ 3 cited

Strong Final State Interactions in gamma.gamma --> W+W-

P. Poulose, L. M. Sehgal

We study the effects of a possible strong final state interaction among longitudinal W's in gamma.gamma --> W+W-. The relevant partial wave amplitudes are modified by an Omnès func…

hep-ph2002★ 1 cited

CP-Violation in the decay B^0, (B^0)bar -> pi^+ pi^- gamma

L. M. Sehgal, J. van Leusen

The decay (B^0)bar -> pi^+ pi^- gamma has a bremsstrahlung component determined by the amplitude for (B^0)bar -> pi^+ pi^-, as well as a direct component determined by the penguin…

hep-ph2001★ 6 cited

Lepton Spectra from e^+ e^- \to W^+ W^- in the BESS model

P. Poulose, S. D. Rindani, L. M. Sehgal

We investigate the reaction e^+ e^- \to W^+ W^-, W^- \to l^- \bar{nu} in a strong coupling scenario as implemented in the BESS model. Energy and angle spectra of the secondary lept…

hep-ph2001★ 42 cited

Charge Asymmetry and Photon Energy Spectrum in the Decay $B_{s} \to l^{+} l^{-} γ$

Y. Dincer, L. M. Sehgal

We consider the structure-dependent amplitude of the decay $B_{s} \to l^{+} l^{-} γ$ $(l = e, μ)$ in a model based on the effective Hamiltonian for $b s ˉ \to l^{+} l^{-}$ containing the Wi…

hep-ph2000

Large Effects of CP- and T-Violation in K^0 Decay

L. M. Sehgal

The epsilon-impurity of the K_L wave-function gives rise to a huge CP-violating effect in the decay K_L -> pi^+ pi^- gamma which is hidden in the polarization state (Stokes vector)…

hep-ph2000★ 9 cited

Time Evolution of Decay Spectrum in K^0, K^0 bar -> pi^+ pi^- e^+ e^-

L. M. Sehgal, J. van Leusen

We consider the decay K^0 (K^0 bar) -> pi^+ pi^- e^+ e^- of a neutral K meson prepared in a state of strangeness +1 (-1). The time evolution of the state produces remarkable time-d…

hep-ph1999★ 23 cited

Violation of Time Reversal Invariance in the Decays K_L -> pi^+ pi^- gamma and K_L -> pi^+ pi^- e^+ e^-

L. M. Sehgal, J. van Leusen

The origin of the large CP-odd and T-odd asymmetry observed in the decay K_L -> pi^+ pi^- e^+ e^- is traced to the polarization properties of the photon in the decay K_L -> pi^+ pi…

hep-ph1999

CP- and T-Violation in the Decay K_L -> pi+ pi- e+ e- and Related Processes

L. M. Sehgal

I review the theoretical basis of the prediction that the decay K_L -> pi+ pi- e+ e- should show a large CP- and T-violation, a prediction now confirmed by the KTeV experiment. The…

Flow of entropy in the evolution of the B^0 anti B^0 system: Upper bound on CP violation from unidirectionality

An upper limit on CP violation in the Bs0​−Bˉs0​ system

PCAC and coherent pion production by low energy neutrinos

Understanding the Forward Muon Deficit in Coherent Pion Production

Lepton Mass Effects in Single Pion Production by Neutrinos

CP Violation and Arrows of Time Evolution of a Neutral K or B Meson from an Incoherent to a Coherent State

PCAC and the Deficit of Forward Muons in pi^+ Production by Neutrinos

Rare Decays as Window to New Physics

CP Violation in the Decays B -> K Kbar in the Presence of D Dbar <-> K Kbar Mixing

Wrong-Helicity Electrons in Radiative Muon Decay

Direct CP Violation in B-+ -> pi-+ omega, pi-+ rho0, pi0 rho-+, and in B-bar0(B0) -> pi-+ rho+- With an Enhanced Branching Ratio for pi0 rho0

Stokes Vector of Photon in the Decays B^0 -> rho^0 gamma and B^0 -> K^* gamma

Large Direct CP Violation in B^0 -> pi^+ pi^- and an Enhanced Branching Ratio for B^0 -> pi^0 pi^0

Right-handed Electrons in Radiative Muon Decay

Electroweak Effects in the Double Dalitz Decay Bs​→l+l−l′+l′−

Interference of Conversion and Bremsstrahlung Amplitudes in the Decay K_L -> mu^+ mu^- gamma

Strong Final State Interactions in gamma.gamma --> W+W-

CP-Violation in the decay B^0, (B^0)bar -> pi^+ pi^- gamma

Lepton Spectra from e^+ e^- \to W^+ W^- in the BESS model

Charge Asymmetry and Photon Energy Spectrum in the Decay Bs​→l+l−γ

Large Effects of CP- and T-Violation in K^0 Decay

Time Evolution of Decay Spectrum in K^0, K^0 bar -> pi^+ pi^- e^+ e^-

Violation of Time Reversal Invariance in the Decays K_L -> pi^+ pi^- gamma and K_L -> pi^+ pi^- e^+ e^-

CP- and T-Violation in the Decay K_L -> pi+ pi- e+ e- and Related Processes

An upper limit on CP violation in the $B_{s}^{0} - B ˉ_{s}^{0}$ system

CP Violation and Arrows of Time Evolution of a Neutral $K$ or $B$ Meson from an Incoherent to a Coherent State

Electroweak Effects in the Double Dalitz Decay $B_{s} \to l^{+} l^{-} l^{' +} l^{' -}$

Charge Asymmetry and Photon Energy Spectrum in the Decay $B_{s} \to l^{+} l^{-} γ$