[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-150249-en":3,"doc-seo-150249-105":30,"detail-sidebar-cat-0-en-105":92},{"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":20,"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},150249,549768702563,"Fahsai","https://ap-avatar.wpscdn.com/avatar/8000c4aa63b76e948b?x-image-process=image/resize,m_fixed,w_180,h_180&k=1786536092046926083",8,"Research & Report","LHC Phenomenology of SUSY multi-step GUTs - PHENO 09","Talk presenting phenomenological aspects of supersymmetry within multi-step grand unified theories relevant for LHC tests. It motivates the need for consistent SUSY extrapolation to high scales and discusses mechanisms such as doublet-triplet splitting, proton-decay constraints, and the origin of Higgs-sector problems. The work further outlines running-coupling behavior in Pati-Salam intermediate stages toward E6 breaking, and addresses flavor-symmetry options that suppress dangerous baryon-violating operators while preserving viable leptoquark interactions.","LHC Phenomenology of SUSY multi-step GUTs  \nJürgen Reuter  \nAlbert-Ludwigs-Universität Freiburg  \nW. Kilian, JR, PL B642 (2006), 81; arXiv:0709.4202; work in progress (with F. Braam, K. Mallot, D. Wiesler)  \nPHENO 09, Madison, May 12, 2009  \n1/14 J. Reuter LHC Phenomenology of SUSY multi-step GUTs PHENO 09, Madison, 12.5.2009  \nMotivation for (SUSY) Unification  \nIncompleteness/Theoretical Dissatisfaction  \nEWSB, H , m􀀗 , DM, hierarchy, . . . . . . . . . , reducible representation:  \nq (3; 2) ~~13~~ 􀀈` (1; 2)􀀀1 􀀈 uc (3 ; 1) 􀀀 ~~43~~ 􀀈dc (3 ; 1) ~~23~~ 􀀈 ec (1; 1) 􀀈H (1; 2)1 Supersymmetry: consistent extrapolation to high scales  \n) unification quantitatively testable) two Higgs doublets Hu ; Hd) TeV-scale SM-superpartners Bottom-Up Approach: just MSSM  \nRunning of 1/α , MSSM, i.e. with 1 × [Hu ⊕ Hd]  \n\n| 1/α1 |\n| --- |\n| 1/α2 ~~  ~~1/α3 |\n|  |\n| |\n|  |\n|  |\n\n60  \n50  \n40  \n30  \n20  \n10  \n0  \n103 106 109 1012 1015 1018  \nµ [GeV]  \nUnification verification only with megatons? What about colliders? I SPA: super precision accurately  \nI Look for chiral exotics  \nI Physics beyond MSSM provides handle to GUT scale  \n2/14 J. Reuter LHC Phenomenology of SUSY multi-step GUTs PHENO 09, Madison, 12.5.2009  \nThe Doublet-Triplet Splitting Problem  \nMSSM Higgses included in 5H 􀀈 5H  \n5H = (3; 1) 􀀀 ~~23~~ 􀀈 (1; 2)1 : 􀀒DHu 􀀓  5H = (3 ; 1) ~~23~~ 􀀈 (1; 2)􀀀1 : 􀀒 􀀏DHcd 􀀓  \nD; Dc colored triplet Hi~ggses with charges 􀀆 ~~1~~3 (EW singlet)  \ncolored Dirac fermion D with charge 􀀀1=3 (EW singlet)  \nUnification requires omitting colored part of SU(5) Higgs 5H ; H  \n1) Doublet-triplet splitting problem (mH 􀀘 100 GeV; mD 􀀘 1016 GeV) Welcome, since SU (5)-symmetric Higgs interactions would read  \n 10 H = `Hdec + q􀀏Hd dc + q􀀏`Dc + dc uc Dc 10 5H 10 = q􀀏Hu uc + Duc ec + Dq􀀏q  \nGenerating SM masses ) leptoquark and diquark coupl. for D; Dc) triggers rapid proton decay  \n3/14 J. Reuter LHC Phenomenology of SUSY multi-step GUTs PHENO 09, Madison, 12.5.2009  \nDoublet-Triplet Splitting  \nPossible scenarios:  \n1. Colored singlets are heavy (GUT scale) = doublet-triplet splitting I enables exact unification near 1016 GeV, excludes rapid proton decay I Proton decay may still be too fast (depends on superpotential)  \nI Doublet-triplet splitting is not trivially available  \n2. Colored singlets are light (TeV scale)  \nI Simple unification no longer happens near 1016 GeV, nor elsewhere  \nRunning of 1/α , MSSM with 1 × [(Hu , D) ⊕ (Hd, Dc )]  \nµ [GeV]  \nI Proton-decay coupl. must be excluded: consistent with GUT symmetry?  \n4/14 J. Reuter LHC Phenomenology of SUSY multi-step GUTs PHENO 09, Madison, 12.5.2009  \nFurther MSSM Issues  \n2) 􀀖 problem: SUSY 􀀖-term 􀀖Hu Hd , not related to soft breaking Why 􀀖 􀀘 O(100 GeV), not O (10 16 GeV)?  \n) Possible extension as a solution: singlet Higgs S with superpotential  \n􀀕SHu Hd ! 􀀕hSiHu Hd = 􀀖Hu Hd  \n) NMSSM: hSi should be somehow related to soft-breaking  \nLarge top Yukawa coupl. drives effective Hu mass squared negative:  \nThis mechanism may also be responsible for hSi in the NMSSMI requires existence of vectorlike pair of chiral superfields  \nI for instance, D and Dc (colored) with SDDc  \n[I](I . . . as)[ . . . as](I . . . as) required by SU(5), if SHuH d is present, gives Dirac mass to DI Without tree-level quartic coupl., the CW mechanism implies  \nhSi 􀀘 4􀀙msoft , so hSi 􀀝 hHi.  \n3) Higgs-matter unification: Why only one family of Higgs matter? E6  \nunifies Higgs fields with SM matter... Possible scenarios: 1. Omit one bi-triplet D; Dc family ) doublet-triplet splitting 2. Add one extra MSSM Higgs family ) ESSM S.King et al., 2005/6  \n3. Different unification pattern     \n5/14 J. Reuter LHC Phenomenology of SUSY multi-step GUTs PHENO 09, Madison, 12.5.2009  \nRunning Couplings: PSSSM [Braam/JR/W. Kilian, 2006/2009]  \nI Additional particles spoil simple unification  \nI Gauge couling unification below 􀀃Planck due to intermediate Pati-Salam SU(4) 􀀂 SU(2)L 􀀂 SU(2)R [􀀂U(1) ]  \nsymmetry at 􀀘 1016 GeV  \n60  \n50  \n40  \n30  \n20  \n10  \n0  \n5/14 J. Re","cbCaibG45bhCCWUx","https://ap.wps.com/l/cbCaibG45bhCCWUx","pdf",941446,1,24,"English","en",105,"# Motivation for (SUSY) Unification\n## Incompleteness and theoretical dissatisfaction\n## Consistent extrapolation to high scales\n# Doublet-Triplet Splitting Problem\n## Proton decay constraints\n## Possible scenarios\n# Further MSSM Issues\n## The μ problem\n## NMSSM and singlet Higgs\n## Higgs-matter unification\n# Running Couplings: PSSSM\n## Intermediate Pati-Salam symmetry and E6 breaking\n# E6 unification with intermediate Pati-Salam symmetry\n# Flavor Symmetry and Proton Decay Suppression","[{\"question\":\"What motivation is given for SUSY unification in this talk?\",\"answer\":\"The talk highlights theoretical dissatisfaction with incomplete unification and emphasizes the consistency of extrapolating SUSY to high scales in a way that remains quantitatively testable.\"},{\"question\":\"How does the doublet-triplet splitting problem connect to proton decay?\",\"answer\":\"The discussion shows that achieving near-GUT-scale unification typically requires omitting colored triplet components, which helps control rapid proton decay, while alternative scenarios can spoil unification or still leave proton decay too fast depending on details.\"},{\"question\":\"What role does intermediate Pati-Salam symmetry play in the running of couplings?\",\"answer\":\"It introduces additional structure in the gauge running, allowing unification behavior below the Planck scale and determining the E6 breaking scale through the crossing of SU(4) and SU(2)L=R couplings.\"}]","LHC Phenomenology of SUSY multi-step GUTs - PHENO 09 | PDF",1787816800,60,{"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":87,"head_meta":89,"extra_data":91,"updated_unix":28},"lhc-phenomenology-of-susy-multi-step-guts-pheno-09","",{"@graph":36,"@context":86},[37,54,69],{"@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/lhc-phenomenology-of-susy-multi-step-guts-pheno-09/150249/",4,{"url":52,"name":13,"@type":55,"author":56,"headline":13,"publisher":58,"fileFormat":61,"inLanguage":23,"description":14,"dateModified":62,"datePublished":63,"encodingFormat":61,"isAccessibleForFree":64,"interactionStatistic":65},"DigitalDocument",{"name":9,"@type":57},"Person",{"url":41,"name":59,"@type":60},"DocShare","Organization","application/pdf","2026-09-04","2026-08-27",true,{"@type":66,"interactionType":67,"userInteractionCount":20},"InteractionCounter",{"@type":68},"ViewAction",{"@type":70,"mainEntity":71},"FAQPage",[72,78,82],{"name":73,"@type":74,"acceptedAnswer":75},"What motivation is given for SUSY unification in this talk?","Question",{"text":76,"@type":77},"The talk highlights theoretical dissatisfaction with incomplete unification and emphasizes the consistency of extrapolating SUSY to high scales in a way that remains quantitatively testable.","Answer",{"name":79,"@type":74,"acceptedAnswer":80},"How does the doublet-triplet splitting problem connect to proton decay?",{"text":81,"@type":77},"The discussion shows that achieving near-GUT-scale unification typically requires omitting colored triplet components, which helps control rapid proton decay, while alternative scenarios can spoil unification or still leave proton decay too fast depending on details.",{"name":83,"@type":74,"acceptedAnswer":84},"What role does intermediate Pati-Salam symmetry play in the running of couplings?",{"text":85,"@type":77},"It introduces additional structure in the gauge running, allowing unification behavior below the Planck scale and determining the E6 breaking scale through the crossing of SU(4) and SU(2)L=R couplings.","https://schema.org",{"og:url":52,"og:type":88,"og:title":13,"og:site_name":59,"og:description":14},"article",{"robots":90,"canonical":52},"index,follow",{"doc_id":7,"site_id":24},{"code":4,"msg":5,"data":93},[94,98,102,106,110,115,120,123,128,131,135],{"id":20,"doc_module":4,"doc_module_name":46,"category_name":95,"show_sort_weight":96,"slug":97},"Story & Novel",90,"story-novel",{"id":47,"doc_module":4,"doc_module_name":46,"category_name":99,"show_sort_weight":100,"slug":101},"Literature",80,"literature",{"id":53,"doc_module":4,"doc_module_name":46,"category_name":103,"show_sort_weight":104,"slug":105},"Exam",70,"exam",{"id":107,"doc_module":4,"doc_module_name":46,"category_name":108,"show_sort_weight":29,"slug":109},5,"Comic","comic",{"id":111,"doc_module":4,"doc_module_name":46,"category_name":112,"show_sort_weight":113,"slug":114},6,"Technology",50,"technology",{"id":116,"doc_module":4,"doc_module_name":46,"category_name":117,"show_sort_weight":118,"slug":119},7,"Healthcare",40,"healthcare",{"id":11,"doc_module":4,"doc_module_name":46,"category_name":12,"show_sort_weight":121,"slug":122},30,"research-report",{"id":124,"doc_module":4,"doc_module_name":46,"category_name":125,"show_sort_weight":126,"slug":127},9,"Religion & Spirituality",20,"religion-spirituality",{"id":126,"doc_module":4,"doc_module_name":46,"category_name":129,"show_sort_weight":126,"slug":130},"World Cup","world-cup",{"id":132,"doc_module":4,"doc_module_name":46,"category_name":133,"show_sort_weight":132,"slug":134},10,"Lifestyle","lifestyle",{"id":136,"doc_module":4,"doc_module_name":46,"category_name":137,"show_sort_weight":107,"slug":138},19,"General","general"]