Dalitz plots[9][10] play a central role in the discovery of new particles in current high-energy physics experiments, including Higgs boson research,[4] and are tools in exploratory efforts that might open avenues beyond the standard model.

[11] His various fundamental contributions have led to practitioners in the field to identify Dalitz as one of particle physics "greatest unsung scientists"[4] and "a theorist exceptionally valued by experimentalists.

[12] Their friendship began around 1948 when Dalitz independently derived Ward's results[13] for the polarisation entanglement of two photons propagating in opposite directions.

[15] While commenting on the physics surrounding the derivation of the probability amplitude by Ward, Dalitz and Duarte wrote: "Ward and Pryce calculated, using quantum mechanics, the distribution of the azimuth angle between the planes of polarization of... two gamma rays from positron-electron annihilation... the two photons are entangled and according to local realism, their polarization planes should become independent... a typical EPR situation.

[15] Dalitz was elected a Fellow of the Royal Society (FRS) in 1960[1] and he received the Hughes Medal in 1975 "for his distinguished contributions to the theory of the basic particles of matter."