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arxiv 1803.07466 v2 pith:VAV7EGRT submitted 2018-03-20 physics.ins-det hep-ex

Mapping the material in the LHCb vertex locator using secondary hadronic interactions

M. Alexander , W. Barter , A. Bay , L.J. Bel , M. van Beuzekom , G. Bogdanova , S. Borghi , T.J.V. Bowcock
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E. Buchanan J. Buytaert K. Carvalho Akiba S. Chen V. Coco P. Collins A. Crocombe F. Da Cunha Marinho E. Dall'Occo S. De Capua C.T. Dean F. Dettori D. Dossett K. Dreimanis G. Dujany L. Eklund T. Evans M. Ferro-Luzzi M. Gersabeck T. Gershon T. Hadavizadeh J. Harrison K. Hennessy W. Hulsbergen D. Hutchcroft P. Ilten E. Jans M. John P. Kopciewicz P. Koppenburg G. Lafferty T. Latham A. Leflat M.W. Majewski R. McNulty J. Mylroie-Smith A. Oblakowska-Mucha C. Parkes A. Pearce A. Poluektov A. Pritchard W. Qian S. Redford S. Richards K. Rinnert E. Rodrigues G. Sarpis M. Schiller H. Schindler M. Smith N.A. Smith T. Szumlak J.J. Velthuis V. Volkov C. Wallace H.M. Wark A. Webber M.R.J. Williams M. Williams
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classification physics.ins-det hep-ex
keywords materialsecondaryvertexinteractionslhcblocationlocatorvelo
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Precise knowledge of the location of the material in the LHCb vertex locator (VELO) is essential to reducing background in searches for long-lived exotic particles, and in identifying jets that originate from beauty and charm quarks. Secondary interactions of hadrons produced in beam-gas collisions are used to map the location of material in the VELO. Using this material map, along with properties of a reconstructed secondary vertex and its constituent tracks, a $p$-value can be assigned to the hypothesis that the secondary vertex originates from a material interaction. A validation of this procedure is presented using photon conversions to dimuons.

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  1. Search for $K_{\mathrm{S(L)}}^{0} \rightarrow \pi^{+}\pi^{-}\mu^{+}\mu^{-}$ decays at LHCb

    hep-ex 2025-11 accept novelty 6.0

    No evidence for KS0 or KL0 to pi+ pi- mu+ mu- decays; first upper limits set at 1.4e-9 and 6.6e-7 (90% CL).