A plasma cutting torch extending around a main axis and comprising: - an electrode; - a nozzle comprising a plasma outfeed orifice, coaxial with the electrode; - a diffuser positioned between the electrode and the nozzle; the electrode, the nozzle and the diffuser delimiting a plasma generation chamber; - a gas feed system, for feeding the gas into the chamber, the diffuser comprising at least one channel for putting into fluid communication the feed system and the chamber, wherein the diffuser comprises a substantially annular main body with a main axis, an annular lower wall, an annular upper wall and a cylindrical outer lateral wall and at least one channel for the passage of gas, said channel having an inlet and an outlet which is positioned at the annular lower wall, the channel having a diameter and an axis of extension which is slanting relative to the main axis, the axis of the channel intersecting the annular lower wall at a point O at the outlet, characterised in that a projection of the axis of the channel in a plane "ar" forming, with an axis "a", an angle θ and a projection of the axis of the channel in a plane "at" forming, with the axis "a", an angle φ, the Cartesian reference system having its centre at point O, the axis "a" parallel with the main axis, an axis "r" in a radial direction and an axis "t" which is perpendicular to the axes "a" and "r", wherein the angle θ is greater than 0 sexagesimal degrees and is less than or equal to 20 sexagesimal degrees, that is to say: 0° < θ ≤ 20° to impart to the velocity versor of the gas a radial component "Vrad" between 0 and 0.34, that is to say 0 < Vrad ≤ 0.34 and wherein the angle φ is greater than or equal to 55 sexagesimal degrees and is less than or equal to 75 sexagesimal degrees, to impart to the velocity versor of the gas an axial component "Vass" and a tangential component "Vtan" whose ratio is between 0.27 and 0.70, that is to say: 0.27 ≤ Vass V tan ≤ 0.70. - an electrode; - a nozzle comprising a plasma outfeed orifice, coaxial with the electrode; - a diffuser positioned between the electrode and the nozzle; the electrode, the nozzle and the diffuser delimiting a plasma generation chamber; - a gas feed system, for feeding the gas into the chamber, the diffuser comprising at least one channel for putting into fluid communication the feed system and the chamber, wherein the diffuser comprises a substantially annular main body with a main axis, an annular lower wall, an annular upper wall and a cylindrical outer lateral wall and at least one channel for the passage of gas, said channel having an inlet and an outlet which is positioned at the annular lower wall, the channel having a diameter and an axis of extension which is slanting relative to the main axis, the axis of the channel intersecting the annular lower wall at a point O at the outlet, characterised in that a projection of the axis of the channel in a plane "ar" forming, with an axis "a", an angle θ and a projection of the axis of the channel in a plane "at" forming, with the axis "a", an angle φ, the Cartesian reference system having its centre at point O, the axis "a" parallel with the main axis, an axis "r" in a radial direction and an axis "t" which is perpendicular to the axes "a" and "r", wherein the angle θ is greater than 0 sexagesimal degrees and is less than or equal to 20 sexagesimal degrees, that is to say: 0° < θ ≤ 20° to impart to the velocity versor of the gas a radial component "Vrad" between 0 and 0.34, that is to say 0 < Vrad ≤ 0.34 and wherein the angle φ is greater than or equal to 55 sexagesimal degrees and is less than or equal to 75 sexagesimal degrees, to impart to the velocity versor of the gas an axial component "Vass" and a tangential component "Vtan" whose ratio is between 0.27 and 0.70, that is to say: 0.27 ≤ Vass V tan ≤ 0.70.