CERN Accelerating science

Scientific Committee Paper
Report number	CERN-LHCC-2024-007 ; LHCC-I-040
Title	AdvSND, The Advanced Scattering and NeutrinoDetector at High Lumi LHC Letter of Intent
Project Manager/Technical Coordinator	De Lellis, Giovanni; Jacobsson, Richard
Author(s)	Abbaneo, D ; Albanese, R ; Alexandrov, A ; Alicante, F ; Androsov, K ; Anokhina, A ; Asada, T ; Asawatangtrakuldee, C ; Ayala Torres, M A ; Battilana, C ; Bay, A ; Bertocco, A ; Bertone, C ; Betancourt, C ; Bick, D ; Biswas, R ; Blanco Castro, A ; Boccia, V ; Bogomilov, M ; Boiano, A ; Bonacorsi, D ; Bonivento, W M ; Bordalo, P ; Boyarsky, A ; Bud, T ; Buonocore, L ; Buontempo, S ; Campanelli, M ; Camporesi, T ; Canale, V ; Centanni, D ; Cerutti, F ; Chernyavskiy, M ; Choi, K -Y ; Cholak, S ; Cindolo, F ; Climescu, M ; Conaboy, A P ; Crespo-Lopez, O ; Dallavalle, G M ; Davino, D ; de Bryas, P T ; De Lellis, G ; de Magistris, M ; De Roeck, A ; De Rùjula, A ; De Simone, D ; Di Crescenzo, A ; Di Ferdinando, D ; Di Luca, S ; Di Meo, P ; Dinc, C ; Donà, R ; Durhan, O ; Fabbri, F ; Fedotovs, F ; Ferrillo, M ; Fiorillo, A ; Fresa, R ; Funk, W ; Gaignant, C ; Garay Walls, F M ; Golovatiuk, A ; Golutvin, A ; Graverini, E ; Guiducci, L ; Guler, A M ; Guliaeva, V ; Haefeli, G J ; Hagner, C ; Helo Herrera, J C ; Herty, A ; van Herwijnen, E ; Iengo, P ; Ilieva, S ; Infantino, A ; Iuliano, A ; Jacobsson, R ; Jeangros, H ; Kamiscioglu, C ; Kauniskangas, A M ; Khalikov, E ; Kim, S H ; Kim, Y G ; Klioutchnikov, G ; Komatsu, M ; Konovalova, N ; Kuleshov, S ; Krzempek, L ; Lacker, H M ; Lantwin, O ; Lasagni Manghi, F ; Lauria, A ; Lee, K Y ; Lee, K S ; Lelong, P ; Lerner, G ; Lo Meo, S ; Loschiavo, V P ; Marcellini, S ; Margiotta, A ; Marion, A -P ; Mascellani, A ; Mei, F ; Miano, A ; Mikulenko, A ; Montesi, M C ; Navarria, F L ; Nuntiyakul, W ; Ogawa, S ; Okateva, N ; Osborne, J ; Ovchynnikov, M ; Paggi, G ; Pal, K ; Panigoni, J ; Park, B D ; Passeggio, G ; Pazzini, J ; Pelletier, S ; Perez Ornedo, M ; Perrotta, A ; Podgrudkov, D ; Polukhina, N ; Prota, A ; Prouteau, O ; Quercia, A ; Ramos, S ; Reghunath, A ; Roganova, T ; Ronchetti, F ; Rottoli, L ; Rovelli, T ; Ruchayskiy, O ; Ruf, T ; Sabate Gilarte, M ; Sadykov, Z ; Samoilov, M ; Sanchez Galan , F ; Scalera, V ; Schmidt-Parzefall, W ; Schneider, O ; Sekhniaidze, G ; Serra, N ; Shaposhnikov, M ; Shevchenko, V ; Shchedrina, T ; Shchutska, L ; Shibuya, H ; Siroli, G P ; Sirri, G ; Soares, G ; Sohn, J Y ; Soto Sandoval, O J ; Spurio, M ; Starkov, N ; Steggemann, J ; Szewczyk, M ; Timiryasov, I ; Tioukov, V ; Tramontano, F ; Trippl, C ; Uluwita, A ; Ursov, E ; Ustyuzhanin, A ; Vankova-Kirilova, G ; Vasquez, G ; Vendeuvre, C ; Verguilov, V ; Viegas Guerreiro Leonardo, N ; Vilela, C ; Visone, C ; Wanke, R ; Yaman, E ; Yang, Z ; Yazici, C ; Yoon, C S ; Zaffaroni, E ; Zamora Saa, J ; Zanetti, M
Corporate author(s)	CERN. Geneva. The LHC experiments Committee ; LHCC
Series	(Letter of Intent)
Submitted by	tiziano.camporesi@cern.ch on 11 Apr 2024
Subject category	Detectors and Experimental Techniques
Abstract	The 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.

Email contact(s) : Giovanni.de.Lellis@cern.ch ; Richard.Jacobsson@cern.ch ; Wolfgang.Funk@cern.ch