Is there a scalar or pseudoscalar at 95 GeV?

We discuss the possibility of interpreting the recent experimental hints in favor of a 95 GeV resonance with extensions of the Standard Model featuring an extra Higgs doublet and SM scalar (<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mn>2</a:mn><a:mi>HDM</a:mi><a:mo>+</a:mo><a:mi mathvariant="normal">s</a:mi></a:mrow></a:math>) or pseudoscalar singlet (<d:math xmlns:d="http://www.w3.org/1998/Math/MathML" display="inline"><d:mrow><d:mn>2</d:mn><d:mi>HDM</d:mi><d:mo>+</d:mo><d:mi mathvariant="normal">a</d:mi></d:mrow></d:math>). We compare the possibility of reproducing the experimental anomalies with the theoretical constraints on the extended Higgs sector as well as complementary bounds coming from flavor physics and other colliders searchers. For both the <g:math xmlns:g="http://www.w3.org/1998/Math/MathML" display="inline"><g:mrow><g:mn>2</g:mn><g:mi>HDM</g:mi><g:mo>+</g:mo><g:mi mathvariant="normal">s</g:mi></g:mrow></g:math> and <j:math xmlns:j="http://www.w3.org/1998/Math/MathML" display="inline"><j:mrow><j:mn>2</j:mn><j:mi>HDM</j:mi><j:mo>+</j:mo><j:mi mathvariant="normal">a</j:mi></j:mrow></j:math> we will consider a generic natural flavor conserving (NFC) model as well as the customary type-I, -II, -X and -Y configurations of the Yukawa coupling to the BSM Higgs bosons. We find that no model is able to reproduce all experimental hints, and plot the <m:math xmlns:m="http://www.w3.org/1998/Math/MathML" display="inline"><m:mn>2</m:mn><m:mi>σ</m:mi></m:math> C.L. favored regions in the parameter space. Published by the American Physical Society 2024