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First results on the scalar WIMP-pion coupling, using the XENON1T experiment

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arxiv 1811.12482 v2 pith:7H4ADCP5 submitted 2018-11-29 hep-ph astro-ph.COhep-exnucl-th

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
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F. Arneodo L. Baudis B. Bauermeister M. L. Benabderrahmane T. Berger P. A. Breur 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. L\'opez Fune C. Macolino J. Mahlstedt A. Manfredini F. Marignetti T. Marrod\'an Undagoitia J. Masbou D. Masson S. Mastroianni M. Messina K. Micheneau K. Miller A. Molinario K. Mor{\aa} 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. Ram\'irez Garc\'ia S. Reichard B. Riedel A. Rizzo A. Rocchetti N. Rupp J. M. F. dos Santos G. Sartorelli N. \v{S}ar\v{c}evi\'c 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 C. Wittweg J. Wulf J. Ye Y. Zhang T. Zhu J. P. Zopounidis M. Hoferichter P. Klos J. Men\'endez A. Schwenk
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classification hep-ph astro-ph.COhep-exnucl-th
keywords wimp-pionchannelcouplingdominateexperimentfirstnucleonsnucleus
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present first results on the scalar WIMP-pion coupling from 1 t$\times$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 non-relativistic 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 $6.4\times10^{-46}$ cm$^2$ (90 % confidence level) at 30 GeV/c$^2$ WIMP mass.

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