Abstract
The LHC copiously produces muons via different processes, and the muon sample will be large at the high-luminosity LHC (HL-LHC). In this work we propose to leverage this large muon sample and utilize the HL-LHC as a muon fixed-target experiment, with the ATLAS calorimeter as the target. We consider a novel analysis for the ATLAS detector, which takes advantage of the two independent muon momentum measurements by the inner detector and the muon system. We show that a comparison of the two measurements, before and after the calorimeters, can probe new force carriers that are coupled to muons and escape detection. The proposed analysis, based on muon samples from $W$ and $Z$ decays only, has a comparable reach to other proposals. In particular, it can explore the part of parameter-space that could explain the muon $g-2$ anomaly.
Highlights
The Standard Model (SM) of particle physics has been successful in describing the known elementary particles and their interactions and is directly tested by experiments up to the TeV scale
We propose to utilize the ATLAS detector as a muon fixed-target experiment, which is sensitive to the missing muon momentum signature and probes Muonic force carrier (MFC)
We propose a search for new physics (NP) using the large sample of muons produced at LHC collisions, and ATLAS detector as a fixed-target experiment sensitive to missing muon momentum signatures
Summary
The Standard Model (SM) of particle physics has been successful in describing the known elementary particles and their interactions and is directly tested by experiments up to the TeV scale. Using muons from Z and W decays, in total Oð1010Þ muons on target at the high-luminosity LHC (HL-LHC), we estimate that the proposed analysis is sensitive to MFC masses in the MeV-GeV range with couplings as low as gX ∼ 10−4–10−3. This MFC parameter space includes the region which is relevant to account for the ðg − 2Þμ anomaly and is comparable to other proposals such as M3 phase 1 and NA62. This analysis can be adopted by future high energy colliders and it can play a role in future detector design
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