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. 2019 Feb 22;122(7):071301.
doi: 10.1103/PhysRevLett.122.071301.

First Results on the Scalar WIMP-Pion Coupling, Using the XENON1T Experiment

E Aprile, J Aalbers, F Agostini, M Alfonsi, L Althueser, F D Amaro, M Anthony, V C Antochi, F Arneodo, L Baudis, B Bauermeister, M L Benabderrahmane, T Berger, P A Breur, A Brown, A Brown, E Brown, S Bruenner, G Bruno, R Budnik, C Capelli, J M R Cardoso, D Cichon, D Coderre, A P Colijn, J Conrad, J P Cussonneau, M P Decowski, P de Perio, P Di Gangi, A Di Giovanni, S Diglio, A Elykov, G Eurin, J Fei, A D Ferella, A Fieguth, W Fulgione, A Gallo Rosso, M Galloway, F Gao, M Garbini, L Grandi, Z Greene, C Hasterok, E Hogenbirk, J Howlett, M Iacovacci, R Itay, F Joerg, B Kaminsky, S Kazama, A Kish, G Koltman, A Kopec, H Landsman, R F Lang, L Levinson, Q Lin, S Lindemann, M Lindner, F Lombardi, J A M Lopes, E López Fune, C Macolino, J Mahlstedt, A Manfredini, F Marignetti, T Marrodán Undagoitia, J Masbou, D Masson, S Mastroianni, M Messina, K Micheneau, K Miller, A Molinario, K Morå, M Murra, J Naganoma, K Ni, U Oberlack, K Odgers, B Pelssers, F Piastra, J Pienaar, V Pizzella, G Plante, R Podviianiuk, N Priel, H Qiu, D Ramírez García, S Reichard, B Riedel, A Rizzo, A Rocchetti, N Rupp, J M F Dos Santos, G Sartorelli, N Šarčević, M Scheibelhut, S Schindler, J Schreiner, D Schulte, M Schumann, L Scotto Lavina, M Selvi, P Shagin, E Shockley, M Silva, H Simgen, C Therreau, D Thers, F Toschi, G Trinchero, C Tunnell, N Upole, M Vargas, O Wack, H Wang, Z Wang, Y Wei, C Weinheimer, D Wenz, C Wittweg, J Wulf, J Ye, Y Zhang, T Zhu, J P Zopounidis; XENON Collaboration <a href="#n6">6</a>; M Hoferichter  1 , P Klos  2   3 , J Menéndez  4 , A Schwenk  5   2   3
Affiliations

First Results on the Scalar WIMP-Pion Coupling, Using the XENON1T Experiment

E Aprile et al. Phys Rev Lett. .

Abstract

We present first results on the scalar coupling of weakly interacting massive particles (WIMPs) to pions from 1 t yr of exposure with the XENON1T experiment. This interaction is generated when the WIMP couples to a virtual pion exchanged between the nucleons in a nucleus. In contrast to most nonrelativistic operators, these pion-exchange currents can be coherently enhanced by the total number of nucleons and therefore may dominate in scenarios where spin-independent WIMP-nucleon interactions are suppressed. Moreover, for natural values of the couplings, they dominate over the spin-dependent channel due to their coherence in the nucleus. Using the signal model of this new WIMP-pion channel, no significant excess is found, leading to an upper limit cross section of 6.4×10^{-46} cm^{2} (90% confidence level) at 30 GeV/c^{2} WIMP mass.

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