Search for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi><mml:mi>γ</mml:mi></mml:math>events with large missing transverse energy in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mover accent="true"><mml:mi>p</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math>collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo mathvariant="bold">=</

Abazov, V. M.; Abbott, B.; Acharya, B. S.; Adams, M. R.; Adams, T.; Alexeev, G. D.; Alkhazov, G.; Alton, A.; Alverson, G.; Aoki, M.; Askew, A.; Atkins, S.; Augsten, K.; Ávila, C.; Badaud, F.; Bagby, L.; Baldin, B.; Bandurin, D. V.; Banerjee, S.; Barberis, E.; Baringer, P.; Barreto, J.; Bartlett, J. F.; Bassler, U.; Bazterra, V. E.; Bean, A.; Begalli, M.; Bellantoni, L.; Beri, S. B.; Bernardi, G.; Bernhard, R.; Bertram, I.; Besançon, M.; Beuselinck, R.; Bezzubov, V. A.; Bhat, P. C.; Bhatia, S.; Bhatnagar, V.; Blazey, G.; Blessing, S.; Bloom, K.; Boehnlein, A.; Boline, D.; Boos, E.; Borissov, G.; Bose, T.; Brandt, A.; Brandt, O.; Brock, R.; Brooijmans, G.; Bross, A.; Brown, D.; Brown, J.; Bu, X. B.; Buehler, M.; Buescher, V.; Bunichev, V.; Burdin, S.; Buszello, C. P.; Camacho-Pérez, E.; Casey, B. C.K.; Castilla‐Valdez, H.; Caughron, S.; Chakrabarti, S.; Chakraborty, D.; Chan, K.; Chandra, A.; Chapon, É.; Chen, G.; Chevalier-Théry, S.; Cho, D. K.; Cho, S. 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doi:10.1103/physrevd.86.071701

Cited by 7 publications

(1 citation statement)

References 37 publications

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“…Because decays to photons are a loop-level effect and are therefore sometimes neglected in electroweakino phenomenology. Indeed, Tevatron studies have placed bounds on neutralino masses in gauge-mediated scenarios by searching for their decays to photons, Z bosons, and gravitinos [31][32][33]. Photon decays are two body processes and can easily compete with three-body decays through an off-shell electroweak gauge boson, such as χ 0 2,3 → + − χ 0 1 .…”

Section: Introductionmentioning

confidence: 99%

Catching sparks from well-forged neutralinos

et al. 2014

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In this paper we present a new search technique for electroweakinos, the superpartners of electroweak gauge and Higgs bosons, based on final states with missing transverse energy, a photon, and a dilepton pair, + − + γ + / E T . Unlike traditional electroweakino searches, which perform best when m χ 0> m Z , our search favors nearly degenerate spectra; degenerate electroweakinos typically have a larger branching ratio to photons, and the cut m m Z effectively removes on-shell Z boson backgrounds while retaining the signal. This feature makes our technique optimal for 'well-tempered' scenarios, where the dark matter relic abundance is achieved with interelectroweakino splittings of ∼ 20 − 70 GeV. Additionally, our strategy applies to a wider range of scenarios where the lightest neutralinos are almost degenerate, but only make up a subdominant component of the dark matter -a spectrum we dub 'well-forged'. Focusing on bino-Higgsino admixtures, we present optimal cuts and expected efficiencies for several benchmark scenarios. We data for discovery, while scenarios with heavier states or larger mass splittings are harder to discriminate from the background and require more data. Unlike many searches for supersymmetry, electroweakino searches are one area where the high luminosity of the next LHC run, rather than the increased energy, is crucial for discovery.

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Section: Introductionmentioning

confidence: 99%

Catching sparks from well-forged neutralinos

et al. 2014

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Naturalness of light neutralino dark matter in pMSSM after LHC, XENON100 and Planck data

Bœhm

Dev²,

Mazumdar³

et al. 2013

J. High Energ. Phys.

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Abstract:We examine the possibility of a light (below 46 GeV) neutralino dark matter (DM) candidate within the 19-parameter phenomenological Minimal Supersymmetric Standard Model (pMSSM) in the light of various recent experimental results, especially from the LHC, XENON100, and Planck. We also study the extent of electroweak fine-tuning for such a light neutralino scenario in view of the null results from the searches for supersymmetry so far. Using a Markov Chain Monte Carlo likelihood analysis of the full pMSSM parameter space, we find that a neutralino DM with mass 10 GeV can in principle still satisfy all the existing constraints. Our light neutralino solutions can be broadly divided into two regions: (i) The solutions in the 10-30 GeV neutralino mass range are highly finetuned and require the existence of light selectrons (below 100 GeV) in order to satisfy the observed DM relic density. We note that these are not yet conclusively ruled out by the existing LEP/LHC results, and a dedicated analysis valid for a non-unified gaugino mass spectrum is required to exclude this possibility. (ii) The solutions with low fine-tuning are mainly in the 30-46 GeV neutralino mass range. However, a major portion of it is already ruled out by the latest XENON100 upper limits on its spin-independent direct detection cross section, and the rest of the allowed points are within the XENON1T projected limit. Thus, we show that the allowed MSSM parameter space for a light neutralino DM below the LEP limit of 46 GeV, possible in supersymmetric models without gaugino mass unification, could be completely accessible in near future. This might be useful in view of the recent claims for positive hints of a DM signal in some direct detection experiments.

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Perturbative unitarity constraints on gauge portals

Hedri

Shepherd

Walker

2017

Physics of the Dark Universe

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Dark matter that was once in thermal equilibrium with the Standard Model is generally prohibited from obtaining all of its mass from the electroweak phase transition. This implies a new scale of physics and mediator particles to facilitate dark matter annihilation. In this work, we focus on dark matter that annihilates through a generic gauge boson portal. We show how partial wave unitarity places upper bounds on the dark gauge boson, dark Higgs and dark matter masses. Outside of well-defined fine-tuned regions, we find an upper bound of 9 TeV for the dark matter mass when the dark Higgs and dark gauge bosons both facilitate the dark matter annihilations. In this scenario, the upper bound on the dark Higgs and dark gauge boson masses are 10 TeV and 16 TeV, respectively. When only the dark gauge boson facilitates dark matter annihilations, we find an upper bound of 3 TeV and 6 TeV for the dark matter and dark gauge boson, respectively. Overall, using the gauge portal as a template, we describe a method to not only place upper bounds on the dark matter mass but also on the new particles with Standard Model quantum numbers. We briefly discuss the reach of future accelerator, direct and indirect detection experiments for this class of models.

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Search forZγevents with large missing transverse energy inpp¯collisions ats=

Cited by 7 publications

References 37 publications

Catching sparks from well-forged neutralinos

Catching sparks from well-forged neutralinos

Naturalness of light neutralino dark matter in pMSSM after LHC, XENON100 and Planck data

Perturbative unitarity constraints on gauge portals

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