TY - JOUR
T1 - M
3
T2 - a new muon missing momentum experiment to probe (g − 2)
μ
and dark matter at Fermilab
AU - Kahn, Yonatan
AU - Krnjaic, Gordan
AU - Tran, Nhan
AU - Whitbeck, Andrew
N1 - We thank Chien-Yi Chen, Ross Corliss, Iftah Galon, Corrado Gatto, Richard Milner, Maxim Pospelov, Philip Schuster, David Shih, Yotam Soreq, Natalia Toro, Chris Tully, Yimin Wang, and Yiming Zhong for helpful conversations. We especially thank Jerry Annala, Mary Convery, Jim Morgan, Sam Posen, Mandy Rominsky, Diktys Stratakis, and Adam Watts for discussions regarding the Fermilab accelerator complex and test beam. We also thank the developers of the LDMX-sw code for simulations used in this study. This work was initiated and performed in part at the Aspen Center for Physics, which is supported by National Science Foundation grant PHY-1607611. Fermilab is operated by Fermi Research Alliance, LLC, under Contract No. DE-AC02-07CH11359 with the US Department of Energy.
PY - 2018/9/1
Y1 - 2018/9/1
N2 -
New light, weakly-coupled particles are commonly invoked to address the persistent ∼ 4σ anomaly in (g−2)
μ
and serve as mediators between dark and visible matter. If such particles couple predominantly to heavier generations and decay invisibly, much of their best-motivated parameter space is inaccessible with existing experimental techniques. In this paper, we present a new fixed-target, missing-momentum search strategy to probe invisibly decaying particles that couple preferentially to muons. In our setup, a relativistic muon beam impinges on a thick active target. The signal consists of events in which a muon loses a large fraction of its incident momentum inside the target without initiating any detectable electromagnetic or hadronic activity in downstream veto systems. We propose a two-phase experiment, M
3
(Muon Missing Momentum), based at Fermilab. Phase 1 with ∼ 10
10
muons on target can test the remaining parameter space for which light invisibly-decaying particles can resolve the (g − 2)
μ
anomaly, while Phase 2 with ∼ 10
13
muons on target can test much of the predictive parameter space over which sub-GeV dark matter achieves freeze-out via muon-philic forces, including gauged U(1)
Lμ−Lτ
.
AB -
New light, weakly-coupled particles are commonly invoked to address the persistent ∼ 4σ anomaly in (g−2)
μ
and serve as mediators between dark and visible matter. If such particles couple predominantly to heavier generations and decay invisibly, much of their best-motivated parameter space is inaccessible with existing experimental techniques. In this paper, we present a new fixed-target, missing-momentum search strategy to probe invisibly decaying particles that couple preferentially to muons. In our setup, a relativistic muon beam impinges on a thick active target. The signal consists of events in which a muon loses a large fraction of its incident momentum inside the target without initiating any detectable electromagnetic or hadronic activity in downstream veto systems. We propose a two-phase experiment, M
3
(Muon Missing Momentum), based at Fermilab. Phase 1 with ∼ 10
10
muons on target can test the remaining parameter space for which light invisibly-decaying particles can resolve the (g − 2)
μ
anomaly, while Phase 2 with ∼ 10
13
muons on target can test much of the predictive parameter space over which sub-GeV dark matter achieves freeze-out via muon-philic forces, including gauged U(1)
Lμ−Lτ
.
KW - Fixed target experiments
UR - http://www.scopus.com/inward/record.url?scp=85053909323&partnerID=8YFLogxK
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U2 - 10.1007/JHEP09(2018)153
DO - 10.1007/JHEP09(2018)153
M3 - Article
AN - SCOPUS:85053909323
SN - 1126-6708
VL - 2018
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
IS - 9
M1 - 153
ER -