Jul 6 – 13, 2022
Bologna, Italy
Europe/Rome timezone

Reconstruction and physics opportunities of long-lived particles decaying downstream of the LHCb magnet

Jul 8, 2022, 5:00 PM
Room 6 (Bianca)

Room 6 (Bianca)

Parallel Talk Operation, Performance and Upgrade (Incl. HL-LHC) of Present Detectors Operation, Performance and Upgrade (Incl. HL-LHC) of Present Detectors


Joan Ruiz Vidal (IFIC-Valencia)


The physics reach of the LHCb detector can be extended by reconstructing particles with a long lifetime that decay downstream of the dipole magnet, using only hits in the furthest tracker from the interaction point. This allows for electromagnetic dipole moment measurements, and increases the reach of beyond the Standard Model long-lived particle searches. However, using tracks to reconstruct particles decaying in this region is challenging, particularly due to the increased combinatorics and reduced momentum and vertex resolutions, which is why it has not been done until now. New approaches have been developed to meet the challenges and obtain worthwhile physics from these previously unused tracks. This talk presents the feasibility demonstration studies performed using Run 2 data, as well as new developments that expand these techniques for further gains in Run 3.

In-person participation Yes

Primary authors

Alessandro De Gennaro (Istituto Nazionale di Fisica Nucleare) Fernando Martinez-Vidal (IFIC (Universidad de Valencia-CSIC)) Andrea Merli (Istituto Nazionale di Fisica Nucleare) Elisabetta Spadaro Norella (Istituto Nazionale di Fisica Nucleare) Giorgia Tonani (Istituto Nazionale di Fisica Nucleare) Izaac Sanderswood (Instituto de Física Corpuscular (Universitat de València)) Jinlin Fu (UCAS) Joan Ruiz Vidal (IFIC-Valencia) Louis Henry (Universita di Milano, IFIC) Nicola Neri (University and INFN Milano) Ying-Rui Hou (University of Chinese Academy of Sciences) Ziyi Wang (UCAS)

Presentation materials