What is the CKM element for J psi and phi meson

Thread starter imgamedeving
Start date Dec 12, 2023
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ckm ckm matrix Particle physics

In summary, the CKM (Cabibbo-Kobayashi-Maskawa) element relevant for the J/ψ and φ mesons is V_cd, which plays a crucial role in the study of flavor physics and CP violation in the context of weak decays involving charm and down quarks. These mesons are important in testing the predictions of the Standard Model and understanding the underlying mechanisms of particle interactions.

Dec 12, 2023

imgamedeving

Homework Statement: Estimate the branching fraction of B0s to J/psi and phi

Relevant Equations: the ckm matrix

I am given the ckm matrix and told that B0s decay to Ds- and pi+ with a branching frcation of 3x10-3. I am then asked to find the branching fraction for other decays. I have done this easily enough for decays like B0s to Ds-K+ by using the ckm matrix elements. However the J/psi meson is a charm anticharm meson. Im just not to sure what value to take from the CKM matrix and would love some help!

FAQ: What is the CKM element for J psi and phi meson

What is the CKM matrix?

The CKM (Cabibbo-Kobayashi-Maskawa) matrix is a unitary matrix that describes the mixing between different generations of quarks in the Standard Model of particle physics. It is crucial for understanding the weak interactions and CP violation in the quark sector.

What are J/psi and phi mesons?

J/psi and phi mesons are types of quarkonium, which are bound states of a quark and its corresponding antiquark. The J/psi meson consists of a charm quark and a charm antiquark (cc̄), while the phi meson is made up of a strange quark and a strange antiquark (ss̄).

How does the CKM matrix relate to J/psi and phi mesons?

The CKM matrix elements are primarily relevant for the transitions between different quark flavors through weak interactions. Since J/psi and phi mesons are flavor eigenstates (cc̄ and ss̄ respectively), the CKM matrix elements do not directly describe these mesons but are more relevant for processes involving transitions between different quark flavors.

Can the CKM matrix elements predict properties of J/psi and phi mesons?

The CKM matrix elements do not directly predict the properties of J/psi and phi mesons, such as their masses or decay modes. However, they are essential for understanding the weak decays of hadrons that produce or involve these mesons, as well as for studying CP violation in processes involving these mesons.

What experiments measure CKM matrix elements involving J/psi and phi mesons?

Experiments at particle colliders, such as those conducted at the Large Hadron Collider (LHC) and B-factories (like Belle and BaBar), measure processes involving J/psi and phi mesons to extract information about CKM matrix elements. These experiments study the production and decay patterns of these mesons to gain insights into the underlying quark transitions and weak interaction dynamics.