002895224 001__ 2895224 002895224 005__ 20240412205137.0 002895224 0248_ $$aoai:cds.cern.ch:2895224$$pcerncds:FULLTEXT 002895224 037__ $$aCERN-LHCC-2024-007 002895224 088__ $$aLHCC-I-040 002895224 100__ $$aAbbaneo, D 002895224 245__ $$aAdvSND, The Advanced Scattering and NeutrinoDetector at High Lumi LHC Letter of Intent 002895224 260__ $$c2024 002895224 269__ $$aGeneva$$bCERN$$c11 Apr 2024 002895224 270__ [email protected] 002895224 270__ [email protected] 002895224 270__ [email protected] 002895224 300__ $$amult. p 002895224 490__ $$aLetter of Intent 002895224 520__ $$aThe SND@LHC experiment has been taking data at the LHC since the beginning of Run3. With the analysis of the data collected in 2022, the experiment has published the observation of collider muon neutrinos, thus paving the way for neutrino physics at the LHC. The results which will be obtained from Run3 will provide the first measurement of neutrinos in an unprecedented energy range and will constrain the gluon Parton Distribution Function using neutrinos as a probe of charm production in an unexplored pseudo-rapidity domain. Nevertheless, the Run3 measurements will be statistically limited, given the geometrical constraints of the current detector and the expected integrated luminosity. This document expresses the interest of the SND@LHC Collaboration to extend the physics reach of the LHC in the neutrino sector and proposes an upgrade of the detector to fully exploit the potential of the High Luminosity LHC (HL-LHC). The factor 5 increase of instantaneous luminosity foreseen by the HL-LHC is incompatible with the usage of nuclear emulsion films as the high-resolution tracking detector in the neutrino target region and we propose to replace them by silicon trackers. Along with the increase of statistical precision, we propose significant improvements of the experimental setup: we plan to add a magnetic spectrometer which would allow separate identification of neutrino and antineutrino interactions for both muon and tau neutrinos. In particular the addition of a magnetic spectrometer would allow the first experimental direct observation and the study of tau antineutrinos, while extending the range of flavour conservation tests. It will also extend the reach for the possible discovery of new exotic phenomena. The proposed modifications to the TII8 environment have two main justifications: the changes to the floor will enhance the acceptance of the detector, also in view of the possible changes in beam crossing angles, while the enlargement of the tunnel is needed to accommodate the magnetic spectrometer. As the feasibility of the tunnel enlargement is currently being investigated, we consider two versions of the upgraded detector, which we call baseline (including the magnetic spectrometer) and minimal (allowing only for the improved acceptance). The option of installing and running the upgraded detector in the current geometrical configuration, without performing any civil engineering work, was also examined. 002895224 595__ $$aLHCC 002895224 595__ $$aCERN EDS 002895224 595__ $$agiva a faire 002895224 65017 $$2SzGeCERN$$aDetectors and Experimental Techniques 002895224 690C_ $$aCERN 002895224 690C_ $$aSCICOM 002895224 690C_ $$aPUBLLHCC 002895224 700__ $$aAlbanese, R 002895224 700__ $$aAlexandrov, A 002895224 700__ $$aAlicante, F 002895224 700__ $$aAndrosov, K 002895224 700__ $$aAnokhina, A 002895224 700__ $$aAsada, T 002895224 700__ $$aAsawatangtrakuldee, C 002895224 700__ $$aAyala Torres, M A 002895224 700__ $$aBattilana, C 002895224 700__ $$aBay, A 002895224 700__ $$aBertocco, A 002895224 700__ $$aBertone, C 002895224 700__ $$aBetancourt, C 002895224 700__ $$aBick, D 002895224 700__ $$aBiswas, R 002895224 700__ $$aBlanco Castro, A 002895224 700__ $$aBoccia, V 002895224 700__ $$aBogomilov, M 002895224 700__ $$aBoiano, A 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$$aDinc, C 002895224 700__ $$aDonà, R 002895224 700__ $$aDurhan, O 002895224 700__ $$aFabbri, F 002895224 700__ $$aFedotovs, F 002895224 700__ $$aFerrillo, M 002895224 700__ $$aFiorillo, A 002895224 700__ $$aFresa, R 002895224 700__ $$aFunk, W 002895224 700__ $$aGaignant, C 002895224 700__ $$aGaray Walls, F M 002895224 700__ $$aGolovatiuk, A 002895224 700__ $$aGolutvin, A 002895224 700__ $$aGraverini, E 002895224 700__ $$aGuiducci, L 002895224 700__ $$aGuler, A M 002895224 700__ $$aGuliaeva, V 002895224 700__ $$aHaefeli, G J 002895224 700__ $$aHagner, C 002895224 700__ $$aHelo Herrera, J C 002895224 700__ $$aHerty, A 002895224 700__ $$avan Herwijnen, E 002895224 700__ $$aIengo, P 002895224 700__ $$aIlieva, S 002895224 700__ $$aInfantino, A 002895224 700__ $$aIuliano, A 002895224 700__ $$aJacobsson, R 002895224 700__ $$aJeangros, H 002895224 700__ $$aKamiscioglu, C 002895224 700__ $$aKauniskangas, A M 002895224 700__ $$aKhalikov, E 002895224 700__ $$aKim, S H 002895224 700__ $$aKim, Y G 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Geneva. The LHC experiments Committee 002895224 710__ $$aLHCC 002895224 710__ $$5PH 002895224 859__ [email protected] 002895224 8564_ $$82524621$$s20558259$$uhttps://cds.cern.ch/record/2895224/files/LHCC-I-040.pdf$$yFulltext 002895224 8564_ $$82524621$$s76773$$uhttps://cds.cern.ch/record/2895224/files/LHCC-I-040.jpg?subformat=icon-180$$xicon-180 002895224 903__ $$spublic 002895224 905__ $$aUniversity of Naples "Federico II"[email protected]$$pDe Lellis, Giovanni 002895224 905__ [email protected]$$pJacobsson, Richard 002895224 906__ [email protected]$$pFunk, Wolfgang 002895224 916__ $$sn$$w202415 002895224 960__ $$a16 002895224 963__ $$aPUBLIC 002895224 970__ $$a000782438CER 002895224 980__ $$aSCICOMMPUBLLHCC 002895224 980__ $$aNote