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; 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

doi:10.1088/1748-0221/13/06/P06008

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
, 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

Research output: Contribution to Journal › Article › Academic › peer-review

Abstract

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.

Original language	English
Article number	P06008
Journal	Journal of Instrumentation
Volume	13
Issue number	6
DOIs	https://doi.org/10.1088/1748-0221/13/06/P06008
Publication status	Published - 13 Jun 2018
Externally published	Yes

Funding

A special acknowledgement goes to all of our LHCb collaborators who contributed to obtaining the results presented in this paper. Specifically, we thank Plamen Hopchev for help developing the special reconstruction used in this study; and Yuri Guz, Christian Joram, and Rosen Matev for providing useful feedback on this article. We express our gratitude to our colleagues in the CERN accelerator departments for the excellent performance of the LHC. We thank the technical and administrative staff at the LHCb institutes. We also acknowledge support for the LHCb collaboration from CERN and from the national agencies: CAPES, CNPq, FAPERJ and FINEP (Brazil); MOST and NSFC (China); CNRS/IN2P3 (France); BMBF, DFG and MPG (Germany); INFN (Italy); NWO (The Netherlands); MNiSW and NCN (Poland); MEN/IFA (Romania); MinES and FASO (Russia); MinECo (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); NSF (U.S.A.). We acknowledge the computing resources that are provided by CERN, IN2P3 (France), KIT and DESY (Germany), INFN (Italy), SURF (The Netherlands), PIC (Spain), GridPP (United Kingdom), RRCKI and Yandex LLC (Russia), CSCS (Switzerland), IFIN-HH (Romania), CBPF (Brazil), PL-GRID (Poland) and OSC (U.S.A.). Individual LHCb groups or members have received support from AvH Foundation (Germany), EPLANET, Marie Skłodowska-Curie Actions and ERC (European Union), ANR, Labex P2IO, ENIGMASS and OCEVU, and Région Auvergne-Rhône-Alpes (France), RFBR and Yandex LLC (Russia), GVA, XuntaGal and GENCAT (Spain), Herchel Smith Fund, the Royal Society, the English-Speaking Union and the Leverhulme Trust (United Kingdom).

Funders	Funder number
Agence Nationale de la Recherche
National Academy of Sciences of Ukraine
Federal Agency for Scientific Organizations
Narodowe Centrum Nauki
OCEVU
National Science Foundation
Institut national de physique nucléaire et de physique des particules
H2020 Marie Skłodowska-Curie Actions
Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Ministry of Science and Technology, Taiwan
Herchel Smith Fund
Leverhulme Trust
Engineering Research Centers
Instituto Nazionale di Fisica Nucleare
Financiadora de Estudos e Projetos
Centre National de la Recherche Scientifique
Bundesministerium für Bildung und Forschung
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Deutsche Forschungsgemeinschaft
European Commission
Région Auvergne-Rhône-Alpes
Russian Foundation for Basic Research
English-Speaking Union
Yandex LLC
MinES
Royal Society
Sociedad Española de Reumatología
EPLANET
Ministerstwo Nauki i Szkolnictwa Wyższego
Generalitat Valenciana
CERN
Alexander von Humboldt-Stiftung
National Natural Science Foundation of China
Science and Technology Facilities Council	ST/N000250/1, ST/J004332/1, ST/K003410/1, ST/M001784/1, ST/L003058/1, LHCb, LHCb Upgrades, ST/N000455/1, ST/L003163/1
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung	166208

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Alexander, M., Barter, W., Bay, A., Bel, L. J., Beuzekom, M. V., Bogdanova, G., Borghi, S., Bowcock, T. J. V., Buchanan, E., Buytaert, J., Akiba, K. C., Chen, S., Coco, V., Collins, P., Crocombe, A., Marinho, F. D. C., Dall'Occo, E., Capua, S. D., Dean, C. T., ... Williams, M. (2018). Mapping the material in the LHCb vertex locator using secondary hadronic interactions. Journal of Instrumentation, 13(6), Article P06008. https://doi.org/10.1088/1748-0221/13/06/P06008

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abstract = "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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Alexander, M, Barter, W, Bay, A, Bel, LJ, Beuzekom, MV, Bogdanova, G, Borghi, S, Bowcock, TJV, Buchanan, E, Buytaert, J, Akiba, KC, Chen, S, Coco, V, Collins, P, Crocombe, A, Marinho, FDC, Dall'Occo, E, Capua, SD, Dean, CT, Dettori, F, Dossett, D, Dreimanis, K, Dujany, G, Eklund, L, Evans, T, Ferro-Luzzi, M, Gersabeck, M, Gershon, T, Hadavizadeh, T, Harrison, J, Hennessy, K, Hulsbergen, W, Hutchcroft, D, Ilten, P, Jans, E, John, M, Kopciewicz, P, Koppenburg, P, Lafferty, G, Latham, T, Leflat, A, Majewski, MW, McNulty, R, Mylroie-Smith, J, Oblakowska-Mucha, A, Parkes, C, Pearce, A, Poluektov, A, Pritchard, A, Qian, W, Redford, S, Richards, S, Rinnert, K, Rodrigues, E, Sarpis, G, Schiller, M, Schindler, H, Smith, M, Smith, NA, Szumlak, T, Velthuis, JJ, Volkov, V, Wallace, C, Wark, HM, Webber, A, Williams, MRJ & Williams, M 2018, 'Mapping the material in the LHCb vertex locator using secondary hadronic interactions', Journal of Instrumentation, vol. 13, no. 6, P06008. https://doi.org/10.1088/1748-0221/13/06/P06008

TY - JOUR

T1 - Mapping the material in the LHCb vertex locator using secondary hadronic interactions

AU - Alexander, M.

AU - Barter, W.

AU - Bay, A.

AU - Bel, L.J.

AU - Beuzekom, M. Van

AU - Bogdanova, G.

AU - Borghi, S.

AU - Bowcock, T.J.V.

AU - Buchanan, E.

AU - Buytaert, J.

AU - Akiba, K. Carvalho

AU - Chen, S.

AU - Coco, V.

AU - Collins, P.

AU - Crocombe, A.

AU - Marinho, F. Da Cunha

AU - Dall'Occo, E.

AU - Capua, S. De

AU - Dean, C.T.

AU - Dettori, F.

AU - Dossett, D.

AU - Dreimanis, K.

AU - Dujany, G.

AU - Eklund, L.

AU - Evans, T.

AU - Ferro-Luzzi, M.

AU - Gersabeck, M.

AU - Gershon, T.

AU - Hadavizadeh, T.

AU - Harrison, J.

AU - Hennessy, K.

AU - Hulsbergen, W.

AU - Hutchcroft, D.

AU - Ilten, P.

AU - Jans, E.

AU - John, M.

AU - Kopciewicz, P.

AU - Koppenburg, P.

AU - Lafferty, G.

AU - Latham, T.

AU - Leflat, A.

AU - Majewski, M.W.

AU - McNulty, R.

AU - Mylroie-Smith, J.

AU - Oblakowska-Mucha, A.

AU - Parkes, C.

AU - Pearce, A.

AU - Poluektov, A.

AU - Pritchard, A.

AU - Qian, W.

AU - Redford, S.

AU - Richards, S.

AU - Rinnert, K.

AU - Rodrigues, E.

AU - Sarpis, G.

AU - Schiller, M.

AU - Schindler, H.

AU - Smith, M.

AU - Smith, N.A.

AU - Szumlak, T.

AU - Velthuis, J.J.

AU - Volkov, V.

AU - Wallace, C.

AU - Wark, H.M.

AU - Webber, A.

AU - Williams, M.R.J.

AU - Williams, M.

PY - 2018/6/13

Y1 - 2018/6/13

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/85049737061

U2 - 10.1088/1748-0221/13/06/P06008

DO - 10.1088/1748-0221/13/06/P06008

M3 - Article

SN - 1748-0221

VL - 13

JO - Journal of Instrumentation

JF - Journal of Instrumentation

IS - 6

M1 - P06008

ER -

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

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