Quasielastic production of polarized τ leptons in ντ and ν¯τ

Hyperon production in quasielastic $\barν_τ-$nucleon scattering

“…Moreover, it is important to point out that in the case of ντ +p −→ τ + +Λ reaction, with the increase in M A , dσ dQ 2 decreases (0.9 GeV to 1.1 GeV), but with the further increase in M A (1.1 GeV to 1.3 GeV), dσ dQ 2 increases, which is not generally the case in ν l + n −→ l − + p; (l = e, µ, τ ) scattering. Moreover, in the case of νl +p −→ l + +n, we have observed that with the increase in M A , dσ dQ 2 decreases (from 0.9 GeV to 1.1 GeV) and with further increase in M A = 1.2 GeV, dσ dQ 2 increases [17]. In the present work, for Λ production we observe similar trend as in the case of ντ induced CCQE reaction [17].…”

“…Moreover, in the case of νl +p −→ l + +n, we have observed that with the increase in M A , dσ dQ 2 decreases (from 0.9 GeV to 1.1 GeV) and with further increase in M A = 1.2 GeV, dσ dQ 2 increases [17]. In the present work, for Λ production we observe similar trend as in the case of ντ induced CCQE reaction [17]. In the ντ induced reactions because of the production of massive τ lepton in the final state, the pseudoscalar form factor becomes significant.…”

“…As the energy increases, the production of the τ leptons is accompanied with the inelastic and deep inelastic production of hadrons. In the energy region of ν τ (ν τ ) experiments, where the energy of the produced τ lepton is not too large compared to its rest mass m τ = 1.776 GeV, the τ leptons would not be completely longitudinally polarized, and would also have transverse component of the polarization [17][18][19][20][21][22][23][24]. Moreover, any presence of the polarization component perpendicular to the reaction plane would provide information about the T noninvariance in ν τ − N interactions [25][26][27][28].…”

$\barν_μ$ induced quasielastic production of hyperons leading to pions

“…In the past, various calculations on the charged current induced (anti)neutrino and electron scattering from the free nucleon and nuclear targets, have been done by many authors in which both the production cross sections as well as the polarization observables of muons and baryons were studied [3][4][5][8][9][10][11][12][13][14][15][16]. With the advancement in the detection technology and the observation of the τ neutrino (ν τ ) experimentally, some calculations for the polarization observables of the τ leptons produced in the ν τ (ν τ ) induced reactions have also been performed in the weak processes [12,[17][18][19][20][21][22]. Recently, Thorpe et al [23] have also studied the effect of second class currents, axial dipole mass and SU(3) symmetry violation on the total and differential scattering cross sections in the antineutrino induced single hyperon production.…”

“…Recently, Thorpe et al [23] have also studied the effect of second class currents, axial dipole mass and SU(3) symmetry violation on the total and differential scattering cross sections in the antineutrino induced single hyperon production. We have also studied the dependence of different vector and axial vector current form factors including the second class current form factors on the total and differential cross section and have tested the degree of time reversal and G-parity violations in the antineutrino as well as electron induced single hyperon production [1][2][3][4][5]17]. In this work, we have extended our model [2,4] for the production cross section and polarization observables of the hyperons produced in the antineutrino and electron induced reactions by taking into account the effect of SU(3) symmetry breaking, following the formalism of Faessler et al [24] in the determination of the vector and axial vector form factors in the strangeness sector.…”