Slides at: bradkav.net/talks.html 1 Searching for low-mass dark matter particles with a massive Ge bolometer operated above-ground arXiv:1901.03588, Phys. Rev. D 99, 082003 (2019) Bradley J. Kavanagh GRAPPA, University of Amsterdam working with the EDELWEISS Collaboration LHC Results Forum - 3rd June 2019 b.j.kavanagh@uva.nl @BradleyKavanagh
Slides at: bradkav.net/talks.html 2 Looking for tiny and tough WIMPs with EDELWEISS-surf arXiv:1901.03588, Phys. Rev. D 99, 082003 (2019) Bradley J. Kavanagh GRAPPA, University of Amsterdam working with the EDELWEISS Collaboration LHC Results Forum - 3rd June 2019 b.j.kavanagh@uva.nl @BradleyKavanagh
EDELWEISS (EDW) Collaboration 3 + Me… [April 2016] Bradley J Kavanagh (GRAPPA) Tiny, tough WIMPs with EDELWEISS-surf LHC Results Forum - 3rd June 2019
<latexit sha1_base64="r8WxWtIX3NnRNyKGounQBojM3is=">ACJHicbVDLSgMxFM34rONr1KWbYFc1DLTCgpui50WcE+oKklk6ZtaDIzJlCGfoxbvwVNy584MKN32KmraCtBwKHc84l9x4/4kxp1/20FhaXldWM2v2+sbm1razs1tVYSwJrZCQh7LuY0U5C2hFM81pPZIUC5/Tmt+/Sv3agErFwuBODyPaFLgbsA4jWBup5VyIFiI9Bo9QV5uUgB5EOSw7kmRXNPqCJkD34y4B7n5wURyhHWk7WzbtjwHniTUkWTFuOW+oHZJY0EATjpVqeG6kmwmWmhFORzaKFY0w6eMubRgaYEFVMxkfOYKHRmnDTijNCzQcq78nEiyUGgrfJNP1ayXiv95jVh3zpsJC6JY04BMPurEHOoQpo3BNpOUaD40BPJzK6Q9LDERJtebVOCN3vyPKkW8l4xX7g9zZYup3VkwD4AMfA2egBG5AGVQAQ/gCbyAV+vRerberY9JdMGazuyBP7C+vgFU8qK9</latexit> <latexit sha1_base64="2nJGzoVtZOM+N/8kUwoO4SuzA=">AB63icbVBNS8NAEJ3Ur1q/qh69LBbBU0lqQY9FLx4r2A9oQ9lsN83S3U3Y3Qgl9C948aCIV/+QN/+NmzYHbX0w8Hhvhpl5QcKZNq7ZQ2Nre2d8q7lb39g8Oj6vFJV8epIrRDYh6rfoA15UzSjmG036iKBYBp71gepf7vSeqNIvlo5kl1Bd4IlnICDa5NCQRG1Vrbt1dAK0TryA1KNAeVb+G45ikgkpDONZ64LmJ8TOsDCOczivDVNMEkyme0IGlEguq/Wx6xdWGWMwljZkgYt1N8TGRZaz0RgOwU2kV71cvE/b5Ca8MbPmExSQyVZLgpTjkyM8sfRmClKDJ9Zgoli9lZEIqwMTaeig3BW315nXQbde+q3nho1lq3RxlOINzuAQPrqEF9CGDhCI4Ble4c0Rzovz7nwsW0tOMXMKf+B8/gABCI42</latexit> Searching for Dark Matter 4 Look for Dark Matter in the form of new W eakly I nteracting M assive P articles ( WIMPs ) Light (scintillation) Detector Target nucleus χ Charge m χ � 1 GeV Heat (ionisation) v χ ∼ 10 − 3 c (phonons) • Low energy nuclear recoils —> need low energy threshold O(keV) • Rare event search —> need large target mass • Large backgrounds —> need shielding and underground labs Galactic ‘wind’ of DM particles Bradley J Kavanagh (GRAPPA) Tiny, tough WIMPs with EDELWEISS-surf LHC Results Forum - 3rd June 2019
Direct Detection Landscape 5 Spin-independent DM-nucleon interactions Spin-dependent DM- neutron interactions �� - �� �� � � � � ��������� - ��� �� - �� �� - � � �������� �� � � - � � � � � � � � ������� �� - �� �� � � � � ���� - �� � � � � � ������ � � - ���� ������ - ������� σ �� � [ �� � ] � ���� ������ - ������� σ �� [ �� � ] �� - �� �� - � � ���� ������ - ������� σ �� � [ �� ] � � � � ���� ������ - ������� σ �� [ �� ] � � � � � � �� - �� �� � � ������ - ��� � EDELWEISS-III � � � � � � � � � � � � ������ - ��� �� ��� - � � �� - �� �� - � � ������ - ��� � � � � - � � � � � � � � � ����� � � �� - �� �� - � � � � � � � � ���� - ���� � - � � � � � � � � �� - �� � �� - � �� - �� �� - � ��� � � � � � � �� - �� �� - �� � �� - �� �� - � �� - �� �� - �� �� - �� �� - � ���� ������ ����� ������� ������� �� ���� ������ ����� ������� ������� �� ����� ����� ���������� �� ������� ��� ����� ����� ���������� �� ������� ��� �������� ��������� ������������ ���������� �������� ��������� ������������ ���������� ������� ��������� �� ��������� ������� ��������� �� ��������� �� - �� �� - �� � �� ��� ���� � �� ��� ���� ���� ������ ���� [ ��� / � � ] ���� ������ ���� [ ��� / � � ] Bradley J Kavanagh (GRAPPA) Tiny, tough WIMPs with EDELWEISS-surf LHC Results Forum - 3rd June 2019
Direct Detection Landscape 6 “Leave no stone unturned!” [Bertone & Tait - 1810.01668] Spin-independent DM-nucleon interactions Spin-dependent DM- neutron interactions �� - �� �� � � � � ��������� - ��� �� - �� �� - � � �������� �� � � - � � � � � � � � ������� �� - �� �� � � � � ���� - �� � � � � � ������ � � - ���� ������ - ������� σ �� � [ �� � ] � ���� ������ - ������� σ �� [ �� � ] �� - �� �� - � � ���� ������ - ������� σ �� � [ �� ] � � � � ���� ������ - ������� σ �� [ �� ] � � � � � � �� - �� �� � � ������ - ��� � EDELWEISS-III � � � � � � � � � � � � ������ - ��� �� ��� - � � �� - �� �� - � � ������ - ��� � � � � - � � � � � � � � � ����� � � �� - �� �� - � � � � � � � � ���� - ���� � - � � � � � � � � �� - �� � �� - � �� - �� �� - � ��� � � � � � � �� - �� �� - �� � �� - �� �� - � �� - �� �� - �� �� - �� �� - � ���� ������ ����� ������� ������� �� ���� ������ ����� ������� ������� �� ����� ����� ���������� �� ������� ��� ����� ����� ���������� �� ������� ��� �������� ��������� ������������ ���������� �������� ��������� ������������ ���������� ������� ��������� �� ��������� ������� ��������� �� ��������� �� - �� �� - �� � �� ��� ���� � �� ��� ���� ���� ������ ���� [ ��� / � � ] ���� ������ ���� [ ��� / � � ] Bradley J Kavanagh (GRAPPA) Tiny, tough WIMPs with EDELWEISS-surf LHC Results Forum - 3rd June 2019
EDELWEISS-III 7 ~ 20 kg Cryogenic Germanium mass (24 x ~800g FID800 modules) Operated in underground lab in Modane, France (1700 m rock —> 5 μ /m 2 /day) (continuous operation since Summer 2014) 50 cm Polyethylene + 20cm Lead shielding Measure heat and ionisation to discriminate electron and nuclear recoils Energy threshold of 2.5 keV —> sensitivity down to WIMP masses of 4 GeV 496 kg-day exposure reported so far [ EDW: 1603.05120, 1607.03367, 1706.01070] Bradley J Kavanagh (GRAPPA) Tiny, tough WIMPs with EDELWEISS-surf LHC Results Forum - 3rd June 2019
EDELWEISS-surf 8 Technological development for DM searches and coherent neutrino-nucleus scattering RED20: Single 33.4g Ge detector with neutron- transmutation-doped Ge (Ge-NTD) phonon sensor Direct measurement of total deposited energy - no quenching, but also no event discrimination Data taking in a surface lab in Lyon (IPNL) for 6 days with minimal shielding Small ~0.03 kg-day exposure [ EDW: 1703.08957,1803.03463] Bradley J Kavanagh (GRAPPA) Tiny, tough WIMPs with EDELWEISS-surf LHC Results Forum - 3rd June 2019
Why I love EDELWEISS-surf 9 Very low energy threshold: 60 eV Minimal shielding Ge, σ SI = 10 − 30 cm 2 10 11 m χ = 0 . 5 GeV m χ = 1 GeV 10 10 χ d R/ d E R [events/keV/kg/day] m χ = 2 GeV 10 9 10 8 Atmosphere 10 7 Earth Shielding 10 6 10 − 2 10 − 1 10 0 Detector Recoil energy, E R [keV] Tiny WIMPs Tough WIMPs Bradley J Kavanagh (GRAPPA) Tiny, tough WIMPs with EDELWEISS-surf LHC Results Forum - 3rd June 2019
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