Discovery prospects for long-lived multiply charged particles at the LHC
Mohammad Mahdi Altakach, Priyanka Lamba, Rafał Masełek, V. A. Mitsou, Kazuki Sakurai
Abstract
Abstract In this work, we aim to provide a comprehensive and largely model independent investigation on prospects to detect long-lived multiply charged particles at the LHC. We consider particles with spin 0 and $$\frac{1}{2}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mfrac> <mml:mn>1</mml:mn> <mml:mn>2</mml:mn> </mml:mfrac> </mml:math> , with electric charges in range $$1 \le |Q/e| \le 8$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>1</mml:mn> <mml:mo>≤</mml:mo> <mml:mo>|</mml:mo> <mml:mi>Q</mml:mi> <mml:mo>/</mml:mo> <mml:mi>e</mml:mi> <mml:mo>|</mml:mo> <mml:mo>≤</mml:mo> <mml:mn>8</mml:mn> </mml:mrow> </mml:math> , which are singlet or triplet under $$SU(3)_C$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>S</mml:mi> <mml:mi>U</mml:mi> <mml:msub> <mml:mrow> <mml:mo>(</mml:mo> <mml:mn>3</mml:mn> <mml:mo>)</mml:mo> </mml:mrow> <mml:mi>C</mml:mi> </mml:msub> </mml:mrow> </mml:math> . Such particles might be produced as particle-antiparticle pairs and propagate through detectors, or form a positronium (quarkonium)-like bound state. We consider both possibilities and estimate lower mass bounds on new particles, that can be provided by ATLAS, CMS and MoEDAL experiments at the end of Run 3 and HL-LHC data taking periods. We find out that the sensitivities of ATLAS and CMS are generally stronger than those of MoEDAL at Run 3, while they may be competitive at HL-LHC for $$3 \lesssim |Q/e| \lesssim 7$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>3</mml:mn> <mml:mo>≲</mml:mo> <mml:mo>|</mml:mo> <mml:mi>Q</mml:mi> <mml:mo>/</mml:mo> <mml:mi>e</mml:mi> <mml:mo>|</mml:mo> <mml:mo>≲</mml:mo> <mml:mn>7</mml:mn> </mml:mrow> </mml:math> for all types of long-lived particles we consider.