Text this: Beam-Target Double-Spin Asymmetry <math display='inline'><msub><mi>A</mi><mi>LT</mi></msub></math> in Charged Pion Production from Deep Inelastic Scattering on a Transversely Polarized <math display='inline'><mmultiscripts><mi>He</mi><mprescripts/><none/><mn>3</mn></mmultiscripts></math> Target at <math display='inline'><mn>1.4</mn><mo><</mo><msup><mi>Q</mi><mn>2</mn></msup><mo><</mo><mn>2.7</mn><mtext> </mtext><mtext> </mtext><msup><mi>GeV</mi><mn>2</mn></msup></math>