A facility to Search for Hidden Particles at the CERN SPS: the SHiP physics case

Alekhin, Sergey; Lyubovitskij, Valery E.; Winkler, Martin W.; Grojean, Christophe; Spannowsky, Michael; Kahlhoefer, Felix; Shaposhnikov, Mikhail; Ovchynnikov, Maksym; Guffanti, Alberto; Staub, Florian; Jaeckel, Joerg; Stolarski, Daniel; Mccullough, Matthew; Ringwald, Andreas; Ivashko, Artem; Schmeier, Daniel; Asaka, Takehiko; Vissani, Francesco; Seto, Osamu; Shrock, Robert; de Gouvea, Andre; Corral, Cristobal; Gorbunov, Dmitry; Goodsell, Mark D.; Krnjaic, Gordan; Drewes, Marco; Rubakov, Valery; Mitselmakher, Guenakh; Strassler, Matt; Dreiner, Herbi; Ritz, Adam; Dell'Oro, Stefano; Helo, Juan Carlos; Altmannshofer, Wolfgang; Bondarenko, Kyrylo; Mohapatra, Rabindra N.; Tello, Vladimir; Choi, Ki-Young; Paschos, Emmanuel; Senjanovic, Goran; Davidson, Sacha; Garbrecht, Bjorn; Shuve, Brian; Fradette, Anthony; Zurek, Kathryn M.; Pilaftsis, Apostolos; Ibarra, Alejandro; Jeong, Yu Seon; Gavela, Belen; Morrissey, David E.; McKeen, David; Gori, Stefania; Bhupal Dev, P.S.; Schwaller, Pedro; Boyarsky, Alexey; Roszkowski, Leszek; Eijima, Shintaro; Hambye, Thomas; Batell, Brian; Kim, Choong Sun; Essig, Rouven; Craig, Nathaniel; Tramontano, Francesco; Ruchayskiy, Oleg; Marcocci, Simone; Schmidt-Hoberg, Kai; Hernandez, Pilar; Pospelov, Maxim; Moch, Sven-Olaf; Tulin, Sean; Kovalenko, Sergey; Kahn, Yonatan; Shchutska, Lesya; Izaguirre, Eder; deNiverville, Patrick; Spray, Andy; Bezrukov, Fedor; Curtin, David; Reno, Mary Hall; Tripathi, Anurag; Hansen, Steen H.; Katz, Andrey; Shelton, Jessie; Schienbein, Ingo; Giudice, Gian F.

doi:10.1088/0034-4885/79/12/124201

Scientific Committee Paper
Report number	arXiv:1504.04855 ; CERN-SPSC-2015-017 ; SPSC-P-350-ADD-1 ; SPSC-P-350-ADD-1
Title	A facility to Search for Hidden Particles at the CERN SPS: the SHiP physics case
Author(s)	Alekhin, Sergey (DESY ; Serpukhov, IHEP) ; Altmannshofer, Wolfgang (Perimeter Inst. Theor. Phys.) ; Asaka, Takehiko (Niigata U.) ; Batell, Brian (CERN) ; Bezrukov, Fedor (Connecticut U. ; Brookhaven) ; Bondarenko, Kyrylo (Leiden U.) ; Boyarsky, Alexey (Leiden U.) ; Choi, Ki-Young (Taejon, Inst. Space Sci.) ; Corral, Cristobal (Santa Maria U., Valparaiso ; CCTVal, Valparaiso) ; Craig, Nathaniel (UC, Santa Barbara) ; Curtin, David (Maryland U.) ; Davidson, Sacha (Lyon, IPN) ; de Gouvea, Andre (Northwestern U.) ; Dell'Oro, Stefano (GSSI, Aquila) ; deNiverville, Patrick (Victoria U.) ; Bhupal Dev, P.S. (Manchester U.) ; Dreiner, Herbi (Bonn U.) ; Drewes, Marco (Munich, Tech. U.) ; Eijima, Shintaro (EPFL, Lausanne, LPPC) ; Essig, Rouven (YITP, Stony Brook) ; Fradette, Anthony (Victoria U.) ; Garbrecht, Bjorn (Munich, Tech. U.) ; Gavela, Belen (Madrid, IFT) ; Giudice, Gian F. (CERN) ; Goodsell, Mark D. (Paris, LPTHE) ; Gorbunov, Dmitry (Moscow, INR ; Moscow, MIPT) ; Gori, Stefania (Perimeter Inst. Theor. Phys.) ; Grojean, Christophe (Barcelona, IFAE ; DESY) ; Guffanti, Alberto (Bohr Inst.) ; Hambye, Thomas (Brussels U.) ; Hansen, Steen H. (Bohr Inst.) ; Helo, Juan Carlos (Santa Maria U., Valparaiso ; CCTVal, Valparaiso) ; Hernandez, Pilar (Valencia U., IFIC) ; Ibarra, Alejandro (Munich, Tech. U.) ; Ivashko, Artem (Leiden U. ; Taras Shevchenko U.) ; Izaguirre, Eder (Perimeter Inst. Theor. Phys.) ; Jaeckel, Joerg (Heidelberg U.) ; Jeong, Yu Seon (Yonsei U.) ; Kahlhoefer, Felix (DESY) ; Kahn, Yonatan (MIT) ; Katz, Andrey (CERN) ; Kim, Choong Sun (Yonsei U.) ; Kovalenko, Sergey (Santa Maria U., Valparaiso ; CCTVal, Valparaiso) ; Krnjaic, Gordan (Perimeter Inst. Theor. Phys.) ; Lyubovitskij, Valery E. (Tubingen U.) ; Marcocci, Simone (Gran Sasso) ; Mccullough, Matthew (CERN) ; McKeen, David (Washington U., Seattle) ; Mitselmakher, Guenakh (Florida U.) ; Moch, Sven-Olaf (Hamburg U., Inst. Theor. Phys. II) ; Mohapatra, Rabindra N. (Maryland U.) ; Morrissey, David E. (TRIUMF) ; Ovchynnikov, Maksym (Taras Shevchenko U.) ; Paschos, Emmanuel (Dortmund U.) ; Pilaftsis, Apostolos (Manchester U.) ; Pospelov, Maxim (Perimeter Inst. Theor. Phys. ; Victoria U.) ; Reno, Mary Hall (Iowa State U.) ; Ringwald, Andreas (DESY) ; Ritz, Adam (Victoria U.) ; Roszkowski, Leszek (NCBJ, Swierk) ; Rubakov, Valery (Moscow, INR) ; Ruchayskiy, Oleg (EPFL, Lausanne, LPPC) ; Schienbein, Ingo (LPSC, Grenoble) ; Schmeier, Daniel (Bonn U.) ; Schmidt-Hoberg, Kai (DESY) ; Schwaller, Pedro (CERN) ; Senjanovic, Goran (Gran Sasso ; ICTP, Trieste) ; Seto, Osamu (Hokkai-Gakuen U.) ; Shaposhnikov, Mikhail (EPFL, Lausanne, LPPC) ; Shchutska, Lesya (Florida U.) ; Shelton, Jessie (Illinois U., Urbana) ; Shrock, Robert (YITP, Stony Brook) ; Shuve, Brian (Perimeter Inst. Theor. Phys.) ; Spannowsky, Michael (Durham U.) ; Spray, Andy (Melbourne U.) ; Staub, Florian (CERN) ; Stolarski, Daniel (CERN) ; Strassler, Matt (Harvard U., Phys. Dept.) ; Tello, Vladimir (Gran Sasso) ; Tramontano, Francesco (INFN, Naples ; Naples U.) ; Tripathi, Anurag (INFN, Naples) ; Tulin, Sean (York U., Canada) ; Vissani, Francesco (Gran Sasso) ; Winkler, Martin W. (Bonn U.) ; Zurek, Kathryn M. (LBL, Berkeley ; UC, Berkeley)
Corporate Author(s)	CERN. Geneva. SPS and PS Experiments Committee ; SPSC
Publication	2016-10-24
Imprint	09 Apr 2015
Number of pages	137
Series	(Addendum (Proposal))
Note	200 pages + appendices/references
In:	Rep. Prog. Phys. 79 (2016) 124201
DOI	10.1088/0034-4885/79/12/124201
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN SPS ; SHiP
Abstract	This paper describes the physics case for a new fixed target facility at CERN SPS. The SHiP (Search for Hidden Particles) experiment is intended to hunt for new physics in the largely unexplored domain of very weakly interacting particles with masses below the Fermi scale, inaccessible to the LHC experiments, and to study tau neutrino physics. The same proton beam setup can be used later to look for decays of tau-leptons with lepton flavour number non-conservation, $\tau\to 3\mu$ and to search for weakly-interacting sub-GeV dark matter candidates. We discuss the evidence for physics beyond the Standard Model and describe interactions between new particles and four different portals - scalars, vectors, fermions or axion-like particles. We discuss motivations for different models, manifesting themselves via these interactions, and how they can be probed with the SHiP experiment and present several case studies. The prospects to search for relatively light SUSY and composite particles at SHiP are also discussed. We demonstrate that the SHiP experiment has a unique potential to discover new physics and can directly probe a number of solutions of beyond the Standard Model puzzles, such as neutrino masses, baryon asymmetry of the Universe, dark matter, and inflation.
Referee	[email protected]
Copyright/License	arXiv nonexclusive-distrib. 1.0 Report: © 2015-2025 CERN (License: CC-BY-4.0)

$Excluded parameter regions for a pseudoscalar $A$ with couplings to two photons/gauge bosons. Compilation adapted and combined from~\cite{Redondo:2008en,Jaeckel:2010ni,Cadamuro:2011fd,Hewett:2012ns,Jaeckel:2012yz,Mimasu:2014nea,Payez:2014xsa,Millea:2015qra}. The right panel focusses on the (sub)GeV region of masses and shows the potential improvement that can be achieved with the future modification of the \ship detector, sensitive to all neutral final states (see footnote~\protect\ref{fn:2}).$ $Excluded parameter regions for a pseudoscalar $A$ with couplings to two photons/gauge bosons. Compilation adapted and combined from~\cite{Redondo:2008en,Jaeckel:2010ni,Cadamuro:2011fd,Hewett:2012ns,Jaeckel:2012yz,Mimasu:2014nea,Payez:2014xsa,Millea:2015qra}. The right panel focusses on the (sub)GeV region of masses and shows the potential improvement that can be achieved with the future modification of the \ship detector, sensitive to all neutral final states (see footnote~\protect\ref{fn:2}).$