Observation of Z decays to four leptons with the CMS detector at the LHC
A bstract The first observation of the Z boson decaying to four leptons in proton-proton collisions is presented. The analyzed data set corresponds to an integrated luminosity of 5.02 fb −1 at TeV collected by the CMS detector at the Large Hadron Collider. A pronounced resonance peak, with a statist...
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Veröffentlicht in: | The journal of high energy physics 2012-12, Vol.2012 (12), Article 34 |
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creator | Suarez, R. Gonzalez Dero, V. Klein, B. Tytgat, M. Pagano, D. Genchev, V. Iaydjiev, P. Chen, H. S. Jiang, C. H. Ptochos, F. Radi, A. Lassila-Perini, K. Lehti, S. Tuuva, T. Heracleous, N. Cherepanov, V. Steinbrück, G. Barth, C. Hauth, T. Simonis, H. J. Bhatnagar, V. Fiore, L. Iaselli, G. Dallavalle, G. M. Fanfani, A. Gonzi, S. Colafranceschi, S. De Guio, F. Malvezzi, S. De Cosa, A. Giassi, A. Park, C. Choi, Y. K. Villasenor-Cendejas, L. M. Shoaib, M. Korablev, A. Ryutin, R. Uzunian, A. Flix, J. Cifuentes, J. A. Brochero Matorras, F. Rodrigo, T. Ruiz-Jimeno, A. Abbaneo, D. Funk, W. Karavakis, E. Mozer, M. U. Quertenmont, L. Antunes, J. Rodrigues Schäfer, C. Spiga, D. Lecomte, P. Pandolfi, F. Pauss, F. Chao, Y. Gokbulut, G. Kangal, E. E. Aliev, T. Deniz, M. Kreczko, L. Brown, R. M. Cutajar, M. Hatherell, Z. Wakefield, S. Scarborough, T. Cox, P. T. Gardner, M. Pellett, D. Rutherford, B. West, C. Bornheim, A. Wagner, S. R. Tan, P. Drozdetskiy, A. Fu, Y. Snowball, M. Weinberg, M. Kalakhety, H. Evdokimov, O. Norbeck, E. Yetkin, T. Murray, M. Lu, Y. Bose, S. Kravchenko, I. Kumar, A. Schmitt, M. Vuosalo, C. Hegeman, J. Piroué, P. Koybasi, O. Boulahouache, C. Rose, K. Perloff, A. Kovitanggoon, K. Libeiro, T. Florez, C. Goodell, J. Hirosky, R. Loveless, R. |
description | A
bstract
The first observation of the Z boson decaying to four leptons in proton-proton collisions is presented. The analyzed data set corresponds to an integrated luminosity of 5.02 fb
−1
at
TeV collected by the CMS detector at the Large Hadron Collider. A pronounced resonance peak, with a statistical significance of 9.7
σ
, is observed in the distribution of the invariant mass of four leptons (electrons and/or muons) with mass and width consistent with expectations for Z boson decays. The branching fraction and cross section reported here are defined by phase space restrictions on the leptons, namely, 80 <
m
4ℓ
< 100 GeV, where
m
4ℓ
is the invariant mass of the four leptons, and
m
ℓℓ
> 4 GeV for all pairs of leptons, where
m
ℓℓ
is the two-lepton invariant mass. The measured branching fraction is
and agrees with the standard model prediction of 4.45 × 10
−6
. The measured cross section times branching fraction is
fb, also consistent with the standard model prediction of 120 fb. The four-lepton mass peak arising from
Z
→ 4
ℓ
decays provides a calibration channel for the Higgs boson search in the
H
→
ZZ
→ 4
ℓ
decay mode. |
doi_str_mv | 10.1007/JHEP12(2012)034 |
format | Article |
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bstract
The first observation of the Z boson decaying to four leptons in proton-proton collisions is presented. The analyzed data set corresponds to an integrated luminosity of 5.02 fb
−1
at
TeV collected by the CMS detector at the Large Hadron Collider. A pronounced resonance peak, with a statistical significance of 9.7
σ
, is observed in the distribution of the invariant mass of four leptons (electrons and/or muons) with mass and width consistent with expectations for Z boson decays. The branching fraction and cross section reported here are defined by phase space restrictions on the leptons, namely, 80 <
m
4ℓ
< 100 GeV, where
m
4ℓ
is the invariant mass of the four leptons, and
m
ℓℓ
> 4 GeV for all pairs of leptons, where
m
ℓℓ
is the two-lepton invariant mass. The measured branching fraction is
and agrees with the standard model prediction of 4.45 × 10
−6
. The measured cross section times branching fraction is
fb, also consistent with the standard model prediction of 120 fb. The four-lepton mass peak arising from
Z
→ 4
ℓ
decays provides a calibration channel for the Higgs boson search in the
H
→
ZZ
→ 4
ℓ
decay mode.</description><identifier>ISSN: 1029-8479</identifier><identifier>ISSN: 1126-6708</identifier><identifier>EISSN: 1029-8479</identifier><identifier>DOI: 10.1007/JHEP12(2012)034</identifier><language>eng</language><publisher>Berlin/Heidelberg: Springer-Verlag</publisher><subject>Classical and Quantum Gravitation ; Cross-sections ; Decay ; Elementary Particles ; Higgs bosons ; High energy physics ; High Energy Physics - Experiment ; Invariants ; Large Hadron Collider ; Leptons ; Luminosity ; Muons ; Particle collisions ; Physics ; Physics and Astronomy ; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS ; Protons ; Quantum Field Theories ; Quantum Field Theory ; Quantum Physics ; Quarks ; Relativity Theory ; Solenoids ; String Theory</subject><ispartof>The journal of high energy physics, 2012-12, Vol.2012 (12), Article 34</ispartof><rights>CERN for the benefit of the CMS collaboration 2012</rights><rights>CERN for the benefit of the CMS collaboration 2012.</rights><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c450t-dd15b7191c0439860f949c0ed427bea3a35cbf455eb94669fec1d7bfbb564c353</citedby><cites>FETCH-LOGICAL-c450t-dd15b7191c0439860f949c0ed427bea3a35cbf455eb94669fec1d7bfbb564c353</cites><orcidid>0000-0003-0885-824X ; 0000-0001-7476-0158 ; 0000-0002-5230-8387 ; 0000-0003-3154-3123 ; 0000-0002-5524-880X ; 0000-0001-6185-2045 ; 0000-0003-1027-3400 ; 0000-0001-9580-683X ; 0000-0002-2431-3381 ; 0000-0002-1275-7292 ; 0000-0003-3090-2948</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/JHEP12(2012)034$$EPDF$$P50$$Gspringer$$Hfree_for_read</linktopdf><linktohtml>$$Uhttps://doi.org/10.1007/JHEP12(2012)034$$EHTML$$P50$$Gspringer$$Hfree_for_read</linktohtml><link.rule.ids>230,314,780,784,885,27924,27925,41120,41488,42189,42557,51319,51576</link.rule.ids><backlink>$$Uhttps://in2p3.hal.science/in2p3-00742132$$DView record in HAL$$Hfree_for_read</backlink><backlink>$$Uhttps://www.osti.gov/servlets/purl/1406503$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Suarez, R. Gonzalez</creatorcontrib><creatorcontrib>Dero, V.</creatorcontrib><creatorcontrib>Klein, B.</creatorcontrib><creatorcontrib>Tytgat, M.</creatorcontrib><creatorcontrib>Pagano, D.</creatorcontrib><creatorcontrib>Genchev, V.</creatorcontrib><creatorcontrib>Iaydjiev, P.</creatorcontrib><creatorcontrib>Chen, H. S.</creatorcontrib><creatorcontrib>Jiang, C. H.</creatorcontrib><creatorcontrib>Ptochos, F.</creatorcontrib><creatorcontrib>Radi, A.</creatorcontrib><creatorcontrib>Lassila-Perini, K.</creatorcontrib><creatorcontrib>Lehti, S.</creatorcontrib><creatorcontrib>Tuuva, T.</creatorcontrib><creatorcontrib>Heracleous, N.</creatorcontrib><creatorcontrib>Cherepanov, V.</creatorcontrib><creatorcontrib>Steinbrück, G.</creatorcontrib><creatorcontrib>Barth, C.</creatorcontrib><creatorcontrib>Hauth, T.</creatorcontrib><creatorcontrib>Simonis, H. J.</creatorcontrib><creatorcontrib>Bhatnagar, V.</creatorcontrib><creatorcontrib>Fiore, L.</creatorcontrib><creatorcontrib>Iaselli, G.</creatorcontrib><creatorcontrib>Dallavalle, G. M.</creatorcontrib><creatorcontrib>Fanfani, A.</creatorcontrib><creatorcontrib>Gonzi, S.</creatorcontrib><creatorcontrib>Colafranceschi, S.</creatorcontrib><creatorcontrib>De Guio, F.</creatorcontrib><creatorcontrib>Malvezzi, S.</creatorcontrib><creatorcontrib>De Cosa, A.</creatorcontrib><creatorcontrib>Giassi, A.</creatorcontrib><creatorcontrib>Park, C.</creatorcontrib><creatorcontrib>Choi, Y. K.</creatorcontrib><creatorcontrib>Villasenor-Cendejas, L. M.</creatorcontrib><creatorcontrib>Shoaib, M.</creatorcontrib><creatorcontrib>Korablev, A.</creatorcontrib><creatorcontrib>Ryutin, R.</creatorcontrib><creatorcontrib>Uzunian, A.</creatorcontrib><creatorcontrib>Flix, J.</creatorcontrib><creatorcontrib>Cifuentes, J. A. Brochero</creatorcontrib><creatorcontrib>Matorras, F.</creatorcontrib><creatorcontrib>Rodrigo, T.</creatorcontrib><creatorcontrib>Ruiz-Jimeno, A.</creatorcontrib><creatorcontrib>Abbaneo, D.</creatorcontrib><creatorcontrib>Funk, W.</creatorcontrib><creatorcontrib>Karavakis, E.</creatorcontrib><creatorcontrib>Mozer, M. U.</creatorcontrib><creatorcontrib>Quertenmont, L.</creatorcontrib><creatorcontrib>Antunes, J. Rodrigues</creatorcontrib><creatorcontrib>Schäfer, C.</creatorcontrib><creatorcontrib>Spiga, D.</creatorcontrib><creatorcontrib>Lecomte, P.</creatorcontrib><creatorcontrib>Pandolfi, F.</creatorcontrib><creatorcontrib>Pauss, F.</creatorcontrib><creatorcontrib>Chao, Y.</creatorcontrib><creatorcontrib>Gokbulut, G.</creatorcontrib><creatorcontrib>Kangal, E. E.</creatorcontrib><creatorcontrib>Aliev, T.</creatorcontrib><creatorcontrib>Deniz, M.</creatorcontrib><creatorcontrib>Kreczko, L.</creatorcontrib><creatorcontrib>Brown, R. 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R.</creatorcontrib><creatorcontrib>Tan, P.</creatorcontrib><creatorcontrib>Drozdetskiy, A.</creatorcontrib><creatorcontrib>Fu, Y.</creatorcontrib><creatorcontrib>Snowball, M.</creatorcontrib><creatorcontrib>Weinberg, M.</creatorcontrib><creatorcontrib>Kalakhety, H.</creatorcontrib><creatorcontrib>Evdokimov, O.</creatorcontrib><creatorcontrib>Norbeck, E.</creatorcontrib><creatorcontrib>Yetkin, T.</creatorcontrib><creatorcontrib>Murray, M.</creatorcontrib><creatorcontrib>Lu, Y.</creatorcontrib><creatorcontrib>Bose, S.</creatorcontrib><creatorcontrib>Kravchenko, I.</creatorcontrib><creatorcontrib>Kumar, A.</creatorcontrib><creatorcontrib>Schmitt, M.</creatorcontrib><creatorcontrib>Vuosalo, C.</creatorcontrib><creatorcontrib>Hegeman, J.</creatorcontrib><creatorcontrib>Piroué, P.</creatorcontrib><creatorcontrib>Koybasi, O.</creatorcontrib><creatorcontrib>Boulahouache, C.</creatorcontrib><creatorcontrib>Rose, K.</creatorcontrib><creatorcontrib>Perloff, A.</creatorcontrib><creatorcontrib>Kovitanggoon, K.</creatorcontrib><creatorcontrib>Libeiro, T.</creatorcontrib><creatorcontrib>Florez, C.</creatorcontrib><creatorcontrib>Goodell, J.</creatorcontrib><creatorcontrib>Hirosky, R.</creatorcontrib><creatorcontrib>Loveless, R.</creatorcontrib><creatorcontrib>The CMS collaboration</creatorcontrib><creatorcontrib>Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)</creatorcontrib><creatorcontrib>Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)</creatorcontrib><creatorcontrib>Argonne National Lab. (ANL), Argonne, IL (United States)</creatorcontrib><title>Observation of Z decays to four leptons with the CMS detector at the LHC</title><title>The journal of high energy physics</title><addtitle>J. High Energ. Phys</addtitle><description>A
bstract
The first observation of the Z boson decaying to four leptons in proton-proton collisions is presented. The analyzed data set corresponds to an integrated luminosity of 5.02 fb
−1
at
TeV collected by the CMS detector at the Large Hadron Collider. A pronounced resonance peak, with a statistical significance of 9.7
σ
, is observed in the distribution of the invariant mass of four leptons (electrons and/or muons) with mass and width consistent with expectations for Z boson decays. The branching fraction and cross section reported here are defined by phase space restrictions on the leptons, namely, 80 <
m
4ℓ
< 100 GeV, where
m
4ℓ
is the invariant mass of the four leptons, and
m
ℓℓ
> 4 GeV for all pairs of leptons, where
m
ℓℓ
is the two-lepton invariant mass. The measured branching fraction is
and agrees with the standard model prediction of 4.45 × 10
−6
. The measured cross section times branching fraction is
fb, also consistent with the standard model prediction of 120 fb. The four-lepton mass peak arising from
Z
→ 4
ℓ
decays provides a calibration channel for the Higgs boson search in the
H
→
ZZ
→ 4
ℓ
decay mode.</description><subject>Classical and Quantum Gravitation</subject><subject>Cross-sections</subject><subject>Decay</subject><subject>Elementary Particles</subject><subject>Higgs bosons</subject><subject>High energy physics</subject><subject>High Energy Physics - Experiment</subject><subject>Invariants</subject><subject>Large Hadron Collider</subject><subject>Leptons</subject><subject>Luminosity</subject><subject>Muons</subject><subject>Particle collisions</subject><subject>Physics</subject><subject>Physics and Astronomy</subject><subject>PHYSICS OF ELEMENTARY PARTICLES AND FIELDS</subject><subject>Protons</subject><subject>Quantum Field Theories</subject><subject>Quantum Field Theory</subject><subject>Quantum Physics</subject><subject>Quarks</subject><subject>Relativity Theory</subject><subject>Solenoids</subject><subject>String Theory</subject><issn>1029-8479</issn><issn>1126-6708</issn><issn>1029-8479</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><sourceid>C6C</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNp1kc1LAzEQxRdRsFbPXoNeFKlOvnabY1mqq1QqqBcvIZvN2i11U5O00v_e1BX14mnC8HuPN3lJcozhEgNkV3fF-AGTMwKYnANlO0kPAxGDIcvE7p_3fnLg_RwAcyyglxTT0hu3VqGxLbI1ekGV0WrjUbCotiuHFmYZbOvRRxNmKMwMyu8fIxOMDtYhFb52kyI_TPZqtfDm6Hv2k-fr8VNeDCbTm9t8NBloxiEMqgrzMsMCa2BUDFOoBRMaTMVIVhpFFeW6rBnnphQsTUVtNK6ysi5LnjJNOe0nJ52v9aGRXjcxyUzbto2BJGaQcqARuuigmVrIpWvelNtIqxpZjCayacmSyvhljGBK1jjSpx29dPZ9ZXyQ83h5G6-QJGakLAbJInXVUdpZ752pf4wxyG0DsmtAbhuQsYGogE7hI9m-Gvfr-5_kE755hKQ</recordid><startdate>20121201</startdate><enddate>20121201</enddate><creator>Suarez, R. 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Gonzalez ; Dero, V. ; Klein, B. ; Tytgat, M. ; Pagano, D. ; Genchev, V. ; Iaydjiev, P. ; Chen, H. S. ; Jiang, C. H. ; Ptochos, F. ; Radi, A. ; Lassila-Perini, K. ; Lehti, S. ; Tuuva, T. ; Heracleous, N. ; Cherepanov, V. ; Steinbrück, G. ; Barth, C. ; Hauth, T. ; Simonis, H. J. ; Bhatnagar, V. ; Fiore, L. ; Iaselli, G. ; Dallavalle, G. M. ; Fanfani, A. ; Gonzi, S. ; Colafranceschi, S. ; De Guio, F. ; Malvezzi, S. ; De Cosa, A. ; Giassi, A. ; Park, C. ; Choi, Y. K. ; Villasenor-Cendejas, L. M. ; Shoaib, M. ; Korablev, A. ; Ryutin, R. ; Uzunian, A. ; Flix, J. ; Cifuentes, J. A. Brochero ; Matorras, F. ; Rodrigo, T. ; Ruiz-Jimeno, A. ; Abbaneo, D. ; Funk, W. ; Karavakis, E. ; Mozer, M. U. ; Quertenmont, L. ; Antunes, J. Rodrigues ; Schäfer, C. ; Spiga, D. ; Lecomte, P. ; Pandolfi, F. ; Pauss, F. ; Chao, Y. ; Gokbulut, G. ; Kangal, E. E. ; Aliev, T. ; Deniz, M. ; Kreczko, L. ; Brown, R. M. ; Cutajar, M. ; Hatherell, Z. ; Wakefield, S. ; Scarborough, T. ; Cox, P. T. ; Gardner, M. ; Pellett, D. ; Rutherford, B. ; West, C. ; Bornheim, A. ; Wagner, S. R. ; Tan, P. ; Drozdetskiy, A. ; Fu, Y. ; Snowball, M. ; Weinberg, M. ; Kalakhety, H. ; Evdokimov, O. ; Norbeck, E. ; Yetkin, T. ; Murray, M. ; Lu, Y. ; Bose, S. ; Kravchenko, I. ; Kumar, A. ; Schmitt, M. ; Vuosalo, C. ; Hegeman, J. ; Piroué, P. ; Koybasi, O. ; Boulahouache, C. ; Rose, K. ; Perloff, A. ; Kovitanggoon, K. ; Libeiro, T. ; Florez, C. ; Goodell, J. ; Hirosky, R. ; Loveless, R.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c450t-dd15b7191c0439860f949c0ed427bea3a35cbf455eb94669fec1d7bfbb564c353</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>Classical and Quantum Gravitation</topic><topic>Cross-sections</topic><topic>Decay</topic><topic>Elementary Particles</topic><topic>Higgs bosons</topic><topic>High energy physics</topic><topic>High Energy Physics - Experiment</topic><topic>Invariants</topic><topic>Large Hadron Collider</topic><topic>Leptons</topic><topic>Luminosity</topic><topic>Muons</topic><topic>Particle collisions</topic><topic>Physics</topic><topic>Physics and Astronomy</topic><topic>PHYSICS OF ELEMENTARY PARTICLES AND FIELDS</topic><topic>Protons</topic><topic>Quantum Field Theories</topic><topic>Quantum Field Theory</topic><topic>Quantum Physics</topic><topic>Quarks</topic><topic>Relativity Theory</topic><topic>Solenoids</topic><topic>String Theory</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Suarez, R. Gonzalez</creatorcontrib><creatorcontrib>Dero, V.</creatorcontrib><creatorcontrib>Klein, B.</creatorcontrib><creatorcontrib>Tytgat, M.</creatorcontrib><creatorcontrib>Pagano, D.</creatorcontrib><creatorcontrib>Genchev, V.</creatorcontrib><creatorcontrib>Iaydjiev, P.</creatorcontrib><creatorcontrib>Chen, H. S.</creatorcontrib><creatorcontrib>Jiang, C. H.</creatorcontrib><creatorcontrib>Ptochos, F.</creatorcontrib><creatorcontrib>Radi, A.</creatorcontrib><creatorcontrib>Lassila-Perini, K.</creatorcontrib><creatorcontrib>Lehti, S.</creatorcontrib><creatorcontrib>Tuuva, T.</creatorcontrib><creatorcontrib>Heracleous, N.</creatorcontrib><creatorcontrib>Cherepanov, V.</creatorcontrib><creatorcontrib>Steinbrück, G.</creatorcontrib><creatorcontrib>Barth, C.</creatorcontrib><creatorcontrib>Hauth, T.</creatorcontrib><creatorcontrib>Simonis, H. J.</creatorcontrib><creatorcontrib>Bhatnagar, V.</creatorcontrib><creatorcontrib>Fiore, L.</creatorcontrib><creatorcontrib>Iaselli, G.</creatorcontrib><creatorcontrib>Dallavalle, G. M.</creatorcontrib><creatorcontrib>Fanfani, A.</creatorcontrib><creatorcontrib>Gonzi, S.</creatorcontrib><creatorcontrib>Colafranceschi, S.</creatorcontrib><creatorcontrib>De Guio, F.</creatorcontrib><creatorcontrib>Malvezzi, S.</creatorcontrib><creatorcontrib>De Cosa, A.</creatorcontrib><creatorcontrib>Giassi, A.</creatorcontrib><creatorcontrib>Park, C.</creatorcontrib><creatorcontrib>Choi, Y. K.</creatorcontrib><creatorcontrib>Villasenor-Cendejas, L. M.</creatorcontrib><creatorcontrib>Shoaib, M.</creatorcontrib><creatorcontrib>Korablev, A.</creatorcontrib><creatorcontrib>Ryutin, R.</creatorcontrib><creatorcontrib>Uzunian, A.</creatorcontrib><creatorcontrib>Flix, J.</creatorcontrib><creatorcontrib>Cifuentes, J. A. Brochero</creatorcontrib><creatorcontrib>Matorras, F.</creatorcontrib><creatorcontrib>Rodrigo, T.</creatorcontrib><creatorcontrib>Ruiz-Jimeno, A.</creatorcontrib><creatorcontrib>Abbaneo, D.</creatorcontrib><creatorcontrib>Funk, W.</creatorcontrib><creatorcontrib>Karavakis, E.</creatorcontrib><creatorcontrib>Mozer, M. U.</creatorcontrib><creatorcontrib>Quertenmont, L.</creatorcontrib><creatorcontrib>Antunes, J. Rodrigues</creatorcontrib><creatorcontrib>Schäfer, C.</creatorcontrib><creatorcontrib>Spiga, D.</creatorcontrib><creatorcontrib>Lecomte, P.</creatorcontrib><creatorcontrib>Pandolfi, F.</creatorcontrib><creatorcontrib>Pauss, F.</creatorcontrib><creatorcontrib>Chao, Y.</creatorcontrib><creatorcontrib>Gokbulut, G.</creatorcontrib><creatorcontrib>Kangal, E. E.</creatorcontrib><creatorcontrib>Aliev, T.</creatorcontrib><creatorcontrib>Deniz, M.</creatorcontrib><creatorcontrib>Kreczko, L.</creatorcontrib><creatorcontrib>Brown, R. M.</creatorcontrib><creatorcontrib>Cutajar, M.</creatorcontrib><creatorcontrib>Hatherell, Z.</creatorcontrib><creatorcontrib>Wakefield, S.</creatorcontrib><creatorcontrib>Scarborough, T.</creatorcontrib><creatorcontrib>Cox, P. T.</creatorcontrib><creatorcontrib>Gardner, M.</creatorcontrib><creatorcontrib>Pellett, D.</creatorcontrib><creatorcontrib>Rutherford, B.</creatorcontrib><creatorcontrib>West, C.</creatorcontrib><creatorcontrib>Bornheim, A.</creatorcontrib><creatorcontrib>Wagner, S. R.</creatorcontrib><creatorcontrib>Tan, P.</creatorcontrib><creatorcontrib>Drozdetskiy, A.</creatorcontrib><creatorcontrib>Fu, Y.</creatorcontrib><creatorcontrib>Snowball, M.</creatorcontrib><creatorcontrib>Weinberg, M.</creatorcontrib><creatorcontrib>Kalakhety, H.</creatorcontrib><creatorcontrib>Evdokimov, O.</creatorcontrib><creatorcontrib>Norbeck, E.</creatorcontrib><creatorcontrib>Yetkin, T.</creatorcontrib><creatorcontrib>Murray, M.</creatorcontrib><creatorcontrib>Lu, Y.</creatorcontrib><creatorcontrib>Bose, S.</creatorcontrib><creatorcontrib>Kravchenko, I.</creatorcontrib><creatorcontrib>Kumar, A.</creatorcontrib><creatorcontrib>Schmitt, M.</creatorcontrib><creatorcontrib>Vuosalo, C.</creatorcontrib><creatorcontrib>Hegeman, J.</creatorcontrib><creatorcontrib>Piroué, P.</creatorcontrib><creatorcontrib>Koybasi, O.</creatorcontrib><creatorcontrib>Boulahouache, C.</creatorcontrib><creatorcontrib>Rose, K.</creatorcontrib><creatorcontrib>Perloff, A.</creatorcontrib><creatorcontrib>Kovitanggoon, K.</creatorcontrib><creatorcontrib>Libeiro, T.</creatorcontrib><creatorcontrib>Florez, C.</creatorcontrib><creatorcontrib>Goodell, J.</creatorcontrib><creatorcontrib>Hirosky, R.</creatorcontrib><creatorcontrib>Loveless, R.</creatorcontrib><creatorcontrib>The CMS collaboration</creatorcontrib><creatorcontrib>Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)</creatorcontrib><creatorcontrib>Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)</creatorcontrib><creatorcontrib>Argonne National Lab. (ANL), Argonne, IL (United States)</creatorcontrib><collection>Springer Nature OA Free Journals</collection><collection>CrossRef</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>Advanced Technologies & Aerospace Collection</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>Advanced Technologies & Aerospace Database</collection><collection>ProQuest Advanced Technologies & Aerospace Collection</collection><collection>Publicly Available Content Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>Hyper Article en Ligne (HAL)</collection><collection>OSTI.GOV - Hybrid</collection><collection>OSTI.GOV</collection><jtitle>The journal of high energy physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Suarez, R. Gonzalez</au><au>Dero, V.</au><au>Klein, B.</au><au>Tytgat, M.</au><au>Pagano, D.</au><au>Genchev, V.</au><au>Iaydjiev, P.</au><au>Chen, H. S.</au><au>Jiang, C. H.</au><au>Ptochos, F.</au><au>Radi, A.</au><au>Lassila-Perini, K.</au><au>Lehti, S.</au><au>Tuuva, T.</au><au>Heracleous, N.</au><au>Cherepanov, V.</au><au>Steinbrück, G.</au><au>Barth, C.</au><au>Hauth, T.</au><au>Simonis, H. J.</au><au>Bhatnagar, V.</au><au>Fiore, L.</au><au>Iaselli, G.</au><au>Dallavalle, G. M.</au><au>Fanfani, A.</au><au>Gonzi, S.</au><au>Colafranceschi, S.</au><au>De Guio, F.</au><au>Malvezzi, S.</au><au>De Cosa, A.</au><au>Giassi, A.</au><au>Park, C.</au><au>Choi, Y. K.</au><au>Villasenor-Cendejas, L. M.</au><au>Shoaib, M.</au><au>Korablev, A.</au><au>Ryutin, R.</au><au>Uzunian, A.</au><au>Flix, J.</au><au>Cifuentes, J. A. Brochero</au><au>Matorras, F.</au><au>Rodrigo, T.</au><au>Ruiz-Jimeno, A.</au><au>Abbaneo, D.</au><au>Funk, W.</au><au>Karavakis, E.</au><au>Mozer, M. U.</au><au>Quertenmont, L.</au><au>Antunes, J. Rodrigues</au><au>Schäfer, C.</au><au>Spiga, D.</au><au>Lecomte, P.</au><au>Pandolfi, F.</au><au>Pauss, F.</au><au>Chao, Y.</au><au>Gokbulut, G.</au><au>Kangal, E. E.</au><au>Aliev, T.</au><au>Deniz, M.</au><au>Kreczko, L.</au><au>Brown, R. M.</au><au>Cutajar, M.</au><au>Hatherell, Z.</au><au>Wakefield, S.</au><au>Scarborough, T.</au><au>Cox, P. T.</au><au>Gardner, M.</au><au>Pellett, D.</au><au>Rutherford, B.</au><au>West, C.</au><au>Bornheim, A.</au><au>Wagner, S. R.</au><au>Tan, P.</au><au>Drozdetskiy, A.</au><au>Fu, Y.</au><au>Snowball, M.</au><au>Weinberg, M.</au><au>Kalakhety, H.</au><au>Evdokimov, O.</au><au>Norbeck, E.</au><au>Yetkin, T.</au><au>Murray, M.</au><au>Lu, Y.</au><au>Bose, S.</au><au>Kravchenko, I.</au><au>Kumar, A.</au><au>Schmitt, M.</au><au>Vuosalo, C.</au><au>Hegeman, J.</au><au>Piroué, P.</au><au>Koybasi, O.</au><au>Boulahouache, C.</au><au>Rose, K.</au><au>Perloff, A.</au><au>Kovitanggoon, K.</au><au>Libeiro, T.</au><au>Florez, C.</au><au>Goodell, J.</au><au>Hirosky, R.</au><au>Loveless, R.</au><aucorp>The CMS collaboration</aucorp><aucorp>Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)</aucorp><aucorp>Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)</aucorp><aucorp>Argonne National Lab. (ANL), Argonne, IL (United States)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Observation of Z decays to four leptons with the CMS detector at the LHC</atitle><jtitle>The journal of high energy physics</jtitle><stitle>J. High Energ. Phys</stitle><date>2012-12-01</date><risdate>2012</risdate><volume>2012</volume><issue>12</issue><artnum>34</artnum><issn>1029-8479</issn><issn>1126-6708</issn><eissn>1029-8479</eissn><abstract>A
bstract
The first observation of the Z boson decaying to four leptons in proton-proton collisions is presented. The analyzed data set corresponds to an integrated luminosity of 5.02 fb
−1
at
TeV collected by the CMS detector at the Large Hadron Collider. A pronounced resonance peak, with a statistical significance of 9.7
σ
, is observed in the distribution of the invariant mass of four leptons (electrons and/or muons) with mass and width consistent with expectations for Z boson decays. The branching fraction and cross section reported here are defined by phase space restrictions on the leptons, namely, 80 <
m
4ℓ
< 100 GeV, where
m
4ℓ
is the invariant mass of the four leptons, and
m
ℓℓ
> 4 GeV for all pairs of leptons, where
m
ℓℓ
is the two-lepton invariant mass. The measured branching fraction is
and agrees with the standard model prediction of 4.45 × 10
−6
. The measured cross section times branching fraction is
fb, also consistent with the standard model prediction of 120 fb. The four-lepton mass peak arising from
Z
→ 4
ℓ
decays provides a calibration channel for the Higgs boson search in the
H
→
ZZ
→ 4
ℓ
decay mode.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer-Verlag</pub><doi>10.1007/JHEP12(2012)034</doi><orcidid>https://orcid.org/0000-0003-0885-824X</orcidid><orcidid>https://orcid.org/0000-0001-7476-0158</orcidid><orcidid>https://orcid.org/0000-0002-5230-8387</orcidid><orcidid>https://orcid.org/0000-0003-3154-3123</orcidid><orcidid>https://orcid.org/0000-0002-5524-880X</orcidid><orcidid>https://orcid.org/0000-0001-6185-2045</orcidid><orcidid>https://orcid.org/0000-0003-1027-3400</orcidid><orcidid>https://orcid.org/0000-0001-9580-683X</orcidid><orcidid>https://orcid.org/0000-0002-2431-3381</orcidid><orcidid>https://orcid.org/0000-0002-1275-7292</orcidid><orcidid>https://orcid.org/0000-0003-3090-2948</orcidid><oa>free_for_read</oa></addata></record> |
fulltext | fulltext |
identifier | ISSN: 1029-8479 |
ispartof | The journal of high energy physics, 2012-12, Vol.2012 (12), Article 34 |
issn | 1029-8479 1126-6708 1029-8479 |
language | eng |
recordid | cdi_osti_scitechconnect_1406503 |
source | Springer Nature OA Free Journals; Alma/SFX Local Collection; SpringerLink Journals - AutoHoldings |
subjects | Classical and Quantum Gravitation Cross-sections Decay Elementary Particles Higgs bosons High energy physics High Energy Physics - Experiment Invariants Large Hadron Collider Leptons Luminosity Muons Particle collisions Physics Physics and Astronomy PHYSICS OF ELEMENTARY PARTICLES AND FIELDS Protons Quantum Field Theories Quantum Field Theory Quantum Physics Quarks Relativity Theory Solenoids String Theory |
title | Observation of Z decays to four leptons with the CMS detector at the LHC |
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