Searching for a Dark Photon with DarkLight. Ross Corliss on behalf of the DarkLight Collaboration
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1 Searching for a Dark Photon with DarkLight Ross Corliss on behalf of the DarkLight Collaboration Dark Sectors April 29, 2016
2 DarkLight Collaboration R. Alarcon D. Blyth, R. Dipert, L. Ice, G. Randall, B. Thorpe Arizona State University, Phoenix, AZ P. Gueye, N. Kalantarians, M. Kohl, A. Liyanage, J. Nazeer Hampton University, Hampton, VA S. Benson, J. Boyce, D. Douglas, C. Hernandez-Garcia, C. Keith, C. Tennant, S. Zhang Thomas Jefferson National Accelerator Facility, Newport News, VA J. Balewski, J. Bernauer, J. Bessuille, R. Corliss, R. Cowan, C. Epstein, P. Fisher, I. Friščić, D. Hasell, E. Ihloff, J. Kelsey, R. Milner, S. Steadman, C. Tschalär, C. Vidal, Y. Wang MIT, Cambridge, MA and Bates Lab M. Garçon CEA Saclay, Gif-sur-Yvette, France R. Cervantes, K. Dehmelt, A. Deshpande, N. Feege Stony Brook University, Stony Brook, NY B. Surrow Temple University, Philadelphia, PA
3 DarkLight Concept "Detecting A Resonance Kinematically with electrons Incident on a Gaseous Hydrogen Target High intensity electron beam on dense gas target to overcome small coupling (~ab -1 /mo) At 100 MeV to rule out pion production With solenoid and tracking for complete reconstruction of final state 3
4 A' Parameter Space 10 4 Dark Photon visible decay 10-2 Hidden Dark Photon Photon Æ invisible Hm decay A' > 2 m c L ϵ DarkLight VEPP-3 MESA Mu3e MAMI APEX LHCb HPS a m, 5 s a e a m,±2 s favored VEPP-3 ô DarkLight ô ô ô KÆpA' ORKA KÆpA' E787, E949 BaBar Improved BaBar Belle II Converted Mono-photon Ha,bL Belle II Standard Belle II Low-E g P. Ilten et al. Phys. Rev. D 92, (2015) SHiP SeaQuest m A [GeV] 10-5 LSND a D =0.1 R. Essig et al. arxiv: m 4
5 Visible A' Search for resonance in e + e - pairs High statistics help overcome irreducible background A' Signal A 0 A 0 QED Background 5
6 Standard Model Environment Luminosity= 2x10 36 cm -2 s -1 Total Møller rate 2º-5º ~ 30 GHz (E<100 MeV) Total Elastic rate 2º-5º ~ 30 GHz (E~100 MeV) Want full reconstruction of final state to suppress these Rate at cm 2 s 1 [Hz / 1 ] Energy [MeV] Rate of 100 MeV Elastic, Moller Scattering in 1 Bins Elastic Moller Angle [ ] Energy of 100 MeV Elastic, Møller Scattering Elastic Møller Angle [ ] C. Epstein 6
7 DarkLight Design Cylindrically symmetric detector 7
8 DarkLight Design Windowless, thin-walled target cell with ~few Torr 8
9 DarkLight Design Silicon detector inside target cell for recoiling proton 9
10 DarkLight Design Cylindrical tracking layers for e + / e - 10
11 DarkLight Design Solenoid and yoke for momentum reconstruction 11
12 Moller Envelope Field also controls Møllers 12
13 Target and Beam Need high luminosity and low-density target 1. Linac+Fixed Target? Target thickness unlimited Beam intensity too low 2. Storage Ring + Internal Target? Target must be thin Beam intensity high 3. ERL + Internal Target? Target somewhat limited Beam intensity high...but unproven 13
14 LERF at Jefferson Lab JLab's Low Energy Recirculating Facility (LERF) e - beam 5mA. ~10 16 e/s at 100MeV 14
15 LERF (people) DarkLight 15
16 LERF at Jefferson Lab 2012 beam test showed precision steering possible Phys. Rev. Lett. 111, (2013) Nucl. Instr. Meth A729, 233 (2013) Nucl. Instr. Meth. A729, 69 (2013) 2012 beam test precision showed 6, 4, and 2 mm steering aperturepossible with few Phys. Rev. Lett. 111, (2013) ppm Nucl. Instr.losses. Meth A729, 233 (2013) Nucl. Instr. Meth. A729, 69 (2013) April 29, 2016 Ross Corliss Dark Sectors
17 Phased Approach Funded: 1A: Learn to operate LERF with Solenoid + Target 1B: Measure radiative Møller rates (spectrometer design) 1C: Proof-of-principle with partial coverage detector in solenoid 2: High-statistics measurement with full DarkLight detector 17
18 Phase 1A ~Torr target with baffles, 0.5 T solenoid 18
19 Phase 1A Beam Interaction Photos from Bates Lab April 29, 2016 Ross Corliss Dark Sectors
20 Phase 1A Detector Measure rates and evaluate detector performance Scintillating strips GEM tracking layers 20
21 Phase 1A Trigger Paddles 9x 1mm Scintillating Fibers + Acrylic Paint April 29, D-printed Lightguide Ross Corliss 3x3mm SiPM + Amplifier Dark Sectors
22 Trigger Prototype Prototype 22
23 Phase 1A GEM Telescope 10 cm x10 cm OLYMPUS Triple-GEM detectors 23
24 Phase 1B Measure radiative Møller rate using dedicated spectrometers 24
25 Phase 1C Proof-of-principle for A' search Partial coverage (detectors similar to 1A) Triggered readout 25
26 Outlook Summer 2016 / Near term: - First internal target / solenoid in an ERL - First measurements of radiative Møllers at this energy Later: - Simulations and design work underway for phase 1C as well as future phase 2. April 29, 2016 Ross Corliss Dark Sectors
27 27
28 Farther Afield Invisibles Search with Photon Veto Elastic Veto with Helical Fibers Pointlike Target with Gas Jet Moller-Free Target with Snowplow-mode Plasma 28
29 lepton tracker 65 Photon Veto Detector Moller envelop 400 proton tracker 80 Be beam pipe 900 Single Photon can be reduced by precision in visible kinematics beam > exit Moller envelope Two Photon requires photon veto to distinguish beam > entrance lepton tracker 29
30 Helical Fibers Chris Tschalaer Yimin Wang 30
31 Helical Fibers Chris Tschalaer Yimin Wang 31
32 Gas Jet Concept Supersonic gas jet crosses beam path Majority of the jet is captured in receiver Very little gas leaks into beamline ~MAGIX target 32
33 Plasma Target? (Here be Dragons) LERF bunch structure is only factor of ~few from plasma blowout regime (For /cm 3 target, need peak current ~60A) Complicated bunch structure needed to maintain energy resolution Need ionizing laser 33
34 Plasma Target? (Here be Dragons) laser pulse ionizes narrow channel low-energy, high peak-current bunch clears e - high-energy bunch sees only protons 34
35 LERF Tour 35
36 LERF Tour 36
37 LERF Tour 37
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