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The X17 particle (X17 boson) is a hypothetical subatomic particle proposed by Attila Krasznahorkay and his colleagues to explain certain anomalous measurement results; these anomalous measurements are known as ATOMKI anomaly or beryllium (8 Be) anomaly or X17 anomaly.
The Higgs boson is postulated by the electroweak theory primarily to explain the origin of particle masses. In a process known as the "Higgs mechanism", the Higgs boson and the other gauge bosons in the Standard Model acquire mass via spontaneous symmetry breaking of the SU(2) gauge symmetry.
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An X boson would have the following two decay modes: [1]: 442 X + → u L + u R X + → e + L + d R. where the two decay products in each process have opposite chirality, u is an up quark, d is a down antiquark, and e + is a positron. A Y boson would have the following three decay modes: [1]: 442 Y + → e + L + u R Y
Standard Model of Particle Physics. The diagram shows the elementary particles of the Standard Model (the Higgs boson, the three generations of quarks and leptons, and the gauge bosons), including their names, masses, spins, charges, chiralities, and interactions with the strong, weak and electromagnetic forces.
What is special to two dimensions is that the scaling dimension of the free boson vanishes. This permits the presence of a non-vanishing background charge, and is at the origin of the theory's conformal symmetry. In probability theory, the free boson can be constructed as a Gaussian free field.
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