On the electromagnetic interaction and the anomalous term in the Duffin-Kemmer-Petiau theory

¹ Facultad de Ingeniería, Universidad Tecnológica del Perú (UTP) - Los Olivos, Lima, Peru
² Facultad de Ciencias Físicas, Universidad Nacional Mayor de San Marcos - Cercado de Lima, Lima, Peru
³ Departamento de Física, Universidade Federal do Maranhão (UFMA) - São Luís, MA, Brazil
⁴ Departamento de Física, Universidade Estadual Paulista (UNESP) - Guaratinguetá, SP, Brazil
⁵ Departamento de Ciencias, Universidad Privada del Norte (UPN) - Los Olivos, Lima, Peru

Received: 15 January 2024
Accepted: 12 April 2024

Abstract

The problem of vectorial mesons embedded in an electromagnetic field via Duffin-Kemmer-Petiau (DKP) formalism is reinvestigated. Considering the electromagnetic interaction as a minimal coupling, an incorrect value is identified for the gyromagnetic factor (g-factor). Furthermore, it is shown that it is cumbersome to find analytical solutions due to the presence of the so-called anomalous term for the spin-1 sector of the DKP theory. Suspecting that the anomalous term results from an incomplete version of the DKP equation to describe the electromagnetic interaction, we consider the addition of a non-minimal coupling. This leads to the correct g-factor and, as a consequence, the anomalous term becomes proportional to an external four current. As an application, the DKP equation with a static uniform magnetic field is considered, yielding the corresponding Landau levels.