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Discovering hidden sectors with monophoton Z′ searches

Gershtein, Yuri and Petriello, Frank and Quackenbush, Seth and Zurek, Kathryn M. (2008) Discovering hidden sectors with monophoton Z′ searches. Physical Review D, 78 (9). Art. no. 095002. ISSN 1550-7998. doi:10.1103/physrevd.78.095002.

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In many theories of physics beyond the standard model, from extra dimensions to Hidden Valleys and models of dark matter, Z′ bosons mediate between standard model particles and hidden sector states. We study the feasibility of observing such hidden states through an invisibly decaying Z′ at the LHC. We focus on the process pp→γZ′→γXX^†, where X is any neutral, (quasi-) stable particle, whether a standard model neutrino or a new state. This complements a previous study using pp→ZZ′→ℓ^+ℓ^−XX^†. Only the Z′ mass and two effective charges are needed to describe this process. If the Z′ decays invisibly only to standard model neutrinos, then these charges are predicted by observation of the Z′ through the Drell-Yan process, allowing discrimination between Z′ decays to standard model ν’s and invisible decays to new states. We carefully discuss all backgrounds and systematic errors that affect this search. We find that hidden sector decays of a 1 TeV Z′ can be observed at 5σ significance with 50 fb^(−1) at the LHC. Observation of a 1.5 TeV state requires super-LHC statistics of 1 ab^(−1). Control of the systematic errors, in particular, the parton distribution function uncertainty of the dominant Zγ background, is crucial to maximize the LHC search reach.

Item Type:Article
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URLURL TypeDescription Paper
Alternate Title:Discovering hidden sectors with mono-photon Z' searches
Additional Information:© 2008 American Physical Society. (Received 24 September 2008; published 6 November 2008) The authors are supported by the DOE grants DE-FG02-95ER40896 and DE-FG02-97ER41022 and by the University of Wisconsin Research Committee with funds provided by the Wisconsin Alumni Research Foundation, and by the Alfred P. Sloan Foundation.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG02-95ER40896
Department of Energy (DOE)DE-FG02-97ER41022
Wisconsin Alumni Research FoundationUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Issue or Number:9
Classification Code:PACS numbers: 12.60.Cn
Record Number:CaltechAUTHORS:20190611-125827994
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96296
Deposited By: George Porter
Deposited On:12 Jun 2019 19:44
Last Modified:16 Nov 2021 17:19

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