Drell-Yan at LHC: Proton+Proton Feynman Diagram

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In summary, the Drell-Yan process at the LHC is typically shown as an interaction between a quark and antiquark, but there are other processes at play that contribute to this reaction. These can include sea antiquarks and quark-gluon initial states where the gluon splits into a quark-antiquark pair. These are known as QCD corrections to the Drell-Yan process.
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Dan2009
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Hey everyone,

Okay so usually drell-yan is shown as interaction of p + p^bar: quark + antiquark -> virtual photon -> lepton(+) + lepton(-). I have seen diagrams of this for the LHC, which is a PROTON+PROTON collider yet drell-yan is still shown as an antiquark coming from one of the protons which cannot be so. Is there an included process which is not being showing on the spectator diagram?

i.e. What is the Feynman diagram (or spectator model diagram) for Drell-Yan from a Proton+Proton Collision?

Regards,

Dan
 
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There are sea antiquarks. That's where the Drell-Yan comes from.
 
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You also have the case where you have a quark-gluon initial state, where the gluon splits into a quark anti-quark pair. The anti-quark then interacts with a quark from the other proton to give the Drell-Yan part, along with an associated jet in the final state from the 'left-over' quark. Note that here, as well, quark and anti-quark can be swapped (so the initial state is a gluon and anti-quark).

Such processes are normally termed (to experimentalists, at least) QCD corrections to the DY process.
 

1. What is the Drell-Yan process in proton-proton collisions?

The Drell-Yan process is a type of scattering process that occurs when two protons collide at high energies. In this process, a quark from one proton and an antiquark from the other proton annihilate, producing a virtual photon or Z boson. This virtual particle then decays into a lepton-antilepton pair, such as an electron-positron or muon-antimuon pair.

2. How is the Drell-Yan process represented in a Feynman diagram?

In a Feynman diagram, the Drell-Yan process is represented by a quark and an antiquark entering from the left and right sides, respectively. These two particles then interact and produce a virtual photon or Z boson, which is represented by a wavy line. The virtual particle then decays into a lepton-antilepton pair, with the outgoing particles represented by solid lines going off in opposite directions.

3. What is the significance of studying Drell-Yan at the Large Hadron Collider (LHC)?

The LHC is the world's most powerful particle accelerator, capable of colliding protons at incredibly high energies. By studying the Drell-Yan process at the LHC, scientists can gain a better understanding of the fundamental interactions between quarks and leptons, as well as test predictions of the Standard Model of particle physics.

4. What are some potential discoveries that can be made through studying Drell-Yan at the LHC?

One potential discovery is the observation of new particles, such as supersymmetric particles, that could be produced in the Drell-Yan process. Additionally, studying Drell-Yan at the LHC can help scientists better understand the structure of protons and the properties of the virtual particles involved in the process.

5. How does the Drell-Yan process contribute to our understanding of the origin of mass?

The Drell-Yan process is closely related to the mechanism of electroweak symmetry breaking, which is responsible for giving particles their mass. By studying the production and decay of virtual particles in the Drell-Yan process, scientists can gain insights into the origin of mass and the role of the Higgs boson in this process.

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