[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-151780-en":3,"doc-seo-151780-105":30,"detail-sidebar-cat-0-en-105":91},{"code":4,"msg":5,"data":6},0,"success",{"doc_id":7,"user_id":8,"nickname":9,"user_avatar":10,"doc_module":4,"category_id":11,"category_name":12,"doc_title":13,"doc_description":14,"doc_content":15,"file_id":16,"file_url":17,"file_type":18,"file_size":19,"view_count":4,"is_deleted":4,"is_public":20,"is_downloadable":20,"audit_status":20,"page_count":21,"language":22,"language_code":23,"site_id":24,"html_lang":23,"table_of_contents":25,"faqs":26,"seo_title":27,"seo_description":14,"update_tm":28,"read_time":29},151780,8796095461610,"Oliver","https://ap-avatar.wpscdn.com/davatar_276721f389ce27ea32af1340a28f341c",8,"Research & Report","Measurement of the B→m+m− branching fraction and search for B0→m+m− with the CMS experiment","Results are presented from a search for rare decays B→μ+μ− and B0→μ+μ− in pp collisions at √s = 7 and 8 TeV, using CMS data samples with integrated luminosities of 5 and 20 fb−1. An unbinned maximum-likelihood fit to the dimuon invariant-mass distribution yields a branching fraction B(B→μ+μ−)=(3.010..09)×10−9, with uncertainties including statistical and systematic contributions. An excess of B→μ+μ− events over background is observed with a 4.3 standard-deviation significance. For B0→μ+μ−, an upper limit B(B0→μ+μ−)\u003C1.1×10−9 at 95% confidence level is set. Both results are consistent with Standard Model expectations.","arXiv : 1307 .5025v3 [hep-ex] 4 Oct 2013  \nEUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH (CERN)  \nCERN-PH-EP/2013-129 2013/10/08  \nCMS-BPH-13-004  \nMeasurement of the B ! m + m 􀀀 branching fraction and search for B0 ! m + m 􀀀 with the CMS experiment  \nThe CMS Collaboration 􀀃  \nAbstract  \nResults are presented from a search for the rare decays B ! m+ m 􀀀 and B0 ! m+ m 􀀀 in pp collisions at ps = 7 and 8 TeV, with data samples corresponding to integrated luminosities of 5 and 20 fb 􀀀1, respectively, collected by the CMS experiment at the LHC. An unbinned maximum-likelihood fit to the dimuon invariant mass distribution gives a branching fraction B (B ! m+ m 􀀀 ) = (3.010..09) 􀀂 10 􀀀9, where the uncertainty includes both statistical and systematic contributions. An excess of B ! m+ m 􀀀 events with respect to background is observed with a significance of 4.3 standard deviations. For the decay B0 ! m+ m 􀀀 an upper limit of B (B0 ! m+ m 􀀀 ) \u003C 1.1 􀀂 10 􀀀9 at the 95% confidence level is determined. Both results are in agreement with the expectations from the standard model.  \nPublished in Physical Review Letters as doi:10 . 1103/PhysRevLett .111 .101804 .  \n􀀍c 2013 CERN for the benefit of the CMS Collaboration. CC-BY-3.0 license  \n􀀃 See Appendix B for the list of collaboration members  \nIn the standard model (SM) of particle physics, tree-level diagrams do not contribute to flavorchanging neutral-current (FCNC) decays. However, FCNC decays may proceed through higherorder loop diagrams, and this opens up the possibility for contributions from non-SM particles. In the SM, the rare FCNC decays B (B0 ) ! m+ m 􀀀 have small branching fractions of B (B ! m+ m 􀀀 ) = (3.57 􀀆 0.30) 􀀂 10 􀀀9, corresponding to the decay-time integrated branching fraction, and B (B0 ! m+ m 􀀀 ) = (1.07 􀀆 0.10) 􀀂 10 􀀀10 [1, 2] . Charge conjugation is implied throughout this Letter. Several extensions of the SM, such as supersymmetric models with nonuniversal Higgs boson masses [3], specific models containing leptoquarks [4], and the minimal supersymmetric standard model with large tan b [5, 6], predict enhancements to the branching fractions for these rare decays. The decay rates can also be suppressed for specific choices of model parameters [7] . Over the past 30 years, significant progress in sensitivity has been made, with exclusion limits on the branching fractions improving by five orders of magnitude. The ARGUS [8], UA1 [9], CLEO [10], Belle [11], BaBar [12], CDF [13], D0 [14], ATLAS [15], CMS [16], and LHCb [17] experiments have all published limits on these decays. The LHCb experiment has subsequently shown evidence, with 3.5 standard deviation significance, for the decay B ! m+ m 􀀀 with B (B ! m+ m 􀀀 ) = (3.211..52) 􀀂 10 􀀀9 [18] .  \nThis Letter reports a measurement of B (B ! m+ m 􀀀 ) based on a simultaneous search for B ! m+ m 􀀀 and B0 ! m+ m 􀀀 decays using a data sample of pp collisions corresponding to integrated luminosities of 5 fb 􀀀1 at p s = 7 TeV and 20 fb 􀀀1 at 8 TeV collected by the Compact Muon Solenoid (CMS) experiment atthe Large Hadron Collider (LHC). For these data, the peak luminosity varied from 3.5 􀀂 1030 to 7.7 􀀂 1033cm 􀀀2s 􀀀1 . The average number of interactions per bunch crossing (pileup) was 9 (21) at p s = 7 (8)TeV.  \nThe search for the B ! m+ m 􀀀 signal, where B denotes B or B0, is performed in the dimuon invariant mass regions around the B and B0 masses. To avoid possible biases, the signal region 5.20 \u003C mmm \u003C 5.45 GeV was kept blind until all selection criteria were established. For the 7 TeV data, this Letter reports a re-analysis of the data used in the previous result [16], where the data were re-blinded. The combinatorial dimuon background, mainly from semileptonic decays of separate B mesons, is evaluated by extrapolating the data in nearby mass sidebands into the signal region. Monte Carlo (MC) simulations are used to account for backgrounds from B and Lb decays. These background samples consist of B ! hmn, B ! hmm, and Lb ! pmn decays, as w","cbCain1htifzFhjf","https://ap.wps.com/l/cbCain1htifzFhjf","pdf",693491,1,31,"English","en",105,"# Abstract\n# Introduction and Standard Model context\n# Data samples and analysis strategy\n# Signal region and background modeling\n## Monte Carlo simulation and normalization/control samples\n# Detector description and event reconstruction\n## Coordinate system and subdetectors\n# Trigger and event selection","[{\"question\":\"What decays are investigated in this study?\",\"answer\":\"The analysis searches for the rare decays B→μ+μ− and B0→μ+μ− using CMS data from pp collisions at √s = 7 and 8 TeV.\"},{\"question\":\"How is the branching fraction for B→μ+μ− extracted?\",\"answer\":\"An unbinned maximum-likelihood fit to the dimuon invariant-mass distribution is used to determine B(B→μ+μ−), including statistical and systematic uncertainties.\"},{\"question\":\"What limits or evidence are reported for B0→μ+μ−?\",\"answer\":\"For B0→μ+μ−, the study sets an upper limit B(B0→μ+μ−) \\u003c 1.1×10−9 at the 95% confidence level, while B→μ+μ− shows an excess with 4.3σ significance.\"}]","Measurement of the B→m+m− branching fraction and search for B0→m+m− with the CMS experiment | PDF",1787849248,78,{"code":4,"msg":31,"data":32},"ok",{"site_id":24,"language":23,"slug":33,"title":13,"keywords":34,"description":14,"schema_data":35,"social_meta":86,"head_meta":88,"extra_data":90,"updated_unix":28},"measurement-of-the-bmm-branching-fraction-and-search-for-b0mm-with-the-cms-experiment","",{"@graph":36,"@context":85},[37,54,68],{"@type":38,"itemListElement":39},"BreadcrumbList",[40,44,48,51],{"item":41,"name":42,"@type":43,"position":20},"https://docshare.wps.com","Home","ListItem",{"item":45,"name":46,"@type":43,"position":47},"https://docshare.wps.com/document/","Document",2,{"item":49,"name":12,"@type":43,"position":50},"https://docshare.wps.com/document/research-report/",3,{"item":52,"name":13,"@type":43,"position":53},"https://docshare.wps.com/document/measurement-of-the-bmm-branching-fraction-and-search-for-b0mm-with-the-cms-experiment/151780/",4,{"url":52,"name":13,"@type":55,"author":56,"headline":13,"publisher":58,"fileFormat":61,"inLanguage":23,"description":14,"dateModified":62,"datePublished":62,"encodingFormat":61,"isAccessibleForFree":63,"interactionStatistic":64},"DigitalDocument",{"name":9,"@type":57},"Person",{"url":41,"name":59,"@type":60},"DocShare","Organization","application/pdf","2026-08-27",true,{"@type":65,"interactionType":66,"userInteractionCount":4},"InteractionCounter",{"@type":67},"ViewAction",{"@type":69,"mainEntity":70},"FAQPage",[71,77,81],{"name":72,"@type":73,"acceptedAnswer":74},"What decays are investigated in this study?","Question",{"text":75,"@type":76},"The analysis searches for the rare decays B→μ+μ− and B0→μ+μ− using CMS data from pp collisions at √s = 7 and 8 TeV.","Answer",{"name":78,"@type":73,"acceptedAnswer":79},"How is the branching fraction for B→μ+μ− extracted?",{"text":80,"@type":76},"An unbinned maximum-likelihood fit to the dimuon invariant-mass distribution is used to determine B(B→μ+μ−), including statistical and systematic uncertainties.",{"name":82,"@type":73,"acceptedAnswer":83},"What limits or evidence are reported for B0→μ+μ−?",{"text":84,"@type":76},"For B0→μ+μ−, the study sets an upper limit B(B0→μ+μ−) \u003C 1.1×10−9 at the 95% confidence level, while B→μ+μ− shows an excess with 4.3σ 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