Search for MSSM Higgs at LEP. Haijun Yang. University of Michigan, Ann Arbor

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1 Search for MSSM Higgs at LEP Haijun Yang University of Michigan, Ann Arbor Physics Seminar at Univ. of Michigan February 4, 2002

2 Introduction of MSSM UTLINE L Main Backgrounds L Analysis Procedure LEP Combined Results Conclusions Haijun Yang Search for MSSM Higgs at LEP

3 Introduction Minimal Supersymmetric Standard Model L Two Higgs doublets 5 Higgs bosons neutral (h & H CP-even, A CP-odd), 2 charged Higgs. Neutral Higgs - Two Complementary Processes Higgsstrahlung Pair Production - e γ / Z * Z q, l, ν q, l -, ν - e γ / Z * A b, τ b, τ - e h b, τ b, τ - e h b, τ b, τ -!#" %$'& ( *) -,. /!#" 2 $4& Haijun Yang Search for MSSM Higgs at LEP 2

4 Introduction L 576 hz production is dominant at low 8:9;=< tanβ s = 206 GeV σ (hz) pb - 0 σ (ha) pb M A (GeV) 576 ha is dominant at large 8>9;?<. Haijun Yang Search for MSSM Higgs at LEP

5 K Introduction Parameters of the MSSM. Ratio of two Higgs vacuum expectation 2. Mass of A boson: B ). Gaugino mass parameter: C 4. Scalar fermion mass: B D 5. Higgsino mass parameter: E L 6. Higgs-sfermion trilinear coupling: F Three Benchmark Scenarios B Maximal G H F E -,:@ I J TeV Minimal Mixing: No mixing in stop sector G H large E F E -,:@ Haijun Yang Search for MSSM Higgs at LEP 4

6 Introduction Higgs decay into LNML and QPR is dominant. mh= 95 GeV a) L Br(h) Br(A) h bb h τ τ - h cc h gg tanβ ma= 80 GeV A bb A τ A τ - cc A gg tanβ b) 576 focused on SUT V L MLWL ML and SUT V L MLXQPY. Haijun Yang Search for MSSM Higgs at LEP 5

7 Main Backgrounds L e - W q q e W q,ν q,l e - Z q q e Z q,l,ν q,l, ν e - q e q \^] Main backgrounds come from [[ and Z \^\ etc., Z Z, [ [ M, Haijun Yang Search for MSSM Higgs at LEP 6

8 Data Taking in Y2k L Haijun Yang Search for MSSM Higgs at LEP 7

9 a a Analysis Procedure L _ 4-jet channel: ha V L MLWL ML Preselection ` Neural Network ` Final Discriminant Step. Preselection: To reject low multiplicity backgrounds while keeping high signal efficiencies(b 90%). Step 2. Neural Network: Discriminant distributions are combined in a neural network. Step. Final Discriminant: Neural network outputs are used to construct final discriminant variable. Haijun Yang Search for MSSM Higgs at LEP 8

10 Preselection Cuts Preselection Cuts L _. Number of tracks c dfe 2. Number of calorimetric clusters c gh. Visible energy: ejilk m n oqp*rts u m vwix 4. Perpendicular imbalance energy y ejilgh 5. Lepton energy m kh GeV n oqp*r 6. Longitudinal component of the missing momentum: z { B p r'r s~} o p r ƒ m ejix Event 6 4-jet using DURHAM algorithm Kinematic fit: 4-momentum conservation(4c) fit Haijun Yang Search for MSSM Higgs at LEP 9

11 P Ÿ Neural Network Inputs:. Event * tˆ 2. Event Sphericity. Event Thrust Neural Network 4. z { B p*r'r 5. Polar angle of Higgs boson: Š p ˆŒˆ r 6. DURHAM jet resolution parameter: > Ž 7. mass B )% B " f B B ) " š œ B B ) ž" L Neural Network utputs: Three outputs,? F, and 7 Haijun Yang Search for MSSM Higgs at LEP

12 ««² «µ Neural Network Inputs of 4-jet Channel L _ Data ª ha(90gev/c 2 ) bbbb x50 WW,qq,ZZ events Y4 4 2 Data ª ha(90gev/c 2 ) bbbb WW,qq,ZZ events Event B-Tag Data ª ha(90gev/c 2 ) bbbb x50 WW,qq,ZZ events Higgs Production Angle ± Data ha(90gev/c 2 ) bbbb WW,qq,ZZ events ³ mass CHI2 Haijun Yang Search for MSSM Higgs at LEP

13 Ó Ó Ë Í Î É È Ê Ê Ç Å Ò Ð Final Discriminant of 4-jet Channel The º¹ Final» Discriminant ¼ º¹ ½ ¾ ¼ À is À " defined ½ ¾ ¼ as: Á. Á " L _ à 4 Data Å Æ ha(90gev/c 2 ) bbbb x50 WW,qq,ZZ events 2 - N Ì40 Ì ËÊ5-2 Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä ha Discriminant Background Data 0Ê Ê Ê Ê Ê Ê Ê Ê ha Efficiency(mh=mA=90GeV) 0.9 Ê 0.8 Ê 0.7 Ê 0.6 Ê 0.5 Ê 0.4 Ê 0. Ê 0.2 Ê 0. Ê ÑEfficiency F(hA) > 0. > 0.6 > 0.9 0Ï Ï Ð Higgs Mass (GeV) Data agree with MC backgrounds. Efficiency is insensitive to Higgs Mass. Haijun Yang Search for MSSM Higgs at LEP 2

14 à à Candidate of ha Ô ÕtÖÕWÕtÖÕ ÚÙ Ø L ßÞÝÜÛ High Discriminant = 0.98 High B-tag = 0.6 à á â ã á ä å æœçœèjélè GeV Haijun Yang Search for MSSM Higgs at LEP

15 à ù ñ û Selection Results ÚÙ Ø L ÞÝÜê ALEPH DELPHI L PAL Inte. Lumi. (ëìîí^ï ) ha ð ì-ñìòìòñì ó â^ôœõöõ 4ø ù Data 5 2 Total Background fermion Bkgd Bkgd Efficiency 47% 47% 42% 48% Expected Signal The signal efficiency and rate are shown for á â å á ä å úwû ü ýþ ÿ, with. Haijun Yang Search for MSSM Higgs at LEP 4

16 à Analysis Procedure Tau channel: ha Ô Õ ÖÕ Preselection ÚÙØ L ÞßÝÜÛ Particle based Jet based selection Final Discriminant Step. Preselection: To reject low multiplicity backgrounds while keeping high signal efficiencies( 80%). Step 2. Final Selection: Two inclusive selections are performed. ne based on tau identification(particle based selection) and the other relying on event kinematics(jet based selection). Step. Final Discriminant: B-tag of jets, dijet masses are used to construct final discriminant. Haijun Yang Search for MSSM Higgs at LEP 5

17 à à E j X e E Preselection Cuts: Analysis Procedure $ ;? E! #" % &' ()$ *-,.0/ :9 effective energy Final Selection Cuts: (F4G4 GeV ÚÙØ L ÞßÝÜÛ particle-based jet-based 8:9 ; C 8:9 ; C *IKJMLNJM P 4 H *QIRJSLNJT P 4 H GeV GeV *-,.0/2 P 465VUG$ *-,.0/2 P 465WUG4 X YZY\[]X ^_^ 4a` X YZY\[bX ^c^ 4a` $ P d Y&Y [ d ^_^ P ( $ GeV $ P d YZY [ d ^_^ P ( $ no - prong decay no - prong decay ^ Xfe,g hih $ `,.i j P 465VU ólknm GeV Haijun Yang Search for MSSM Higgs at LEP 6

18 à t t { N- plots of Tau channel Selection Cuts ÚÙØ L ÞÝÜÛ Number of Events / q6 p4 udata Background v w ha bbx ττ( ),90 GeV Cut L Number of Events / z 7 q 6 y 5 p4 2 tcut udata Background v w ha bbx ττ( ),90 GeV L Number of Events / 5.0 GeV 2 o0o o o o o o rs E vis / s udata L Background v w ha bbx ττ( ),90 GeV Cut - o p q E e (GeV) Number of Events / GeV o0 2 8 q6 4 2 o tcut ln(y 4 ) udata Background v w ha bbx ττ( ),90 GeV tcut o p q M qq (GeV) L Haijun Yang Search for MSSM Higgs at LEP 7

19 u w w u w w Discriminant Variables of Tau Channel Distributions used to construct final discriminant. ~ } L ƒ 2 L Data Background ˆ w ha bbx ττ(ττ x bb),90 GeV 2 L Data Background ˆ w ha bbx ττ(ττ x bb),90 GeV Events/ Events/ B-tag B-tag2 2 L Data Background w x x ha bbττ(ττbb),90 GeV 2 L Data Background w x x ha bbττ(ττbb),90 GeV Events/5 GeV - Events/5 GeV y z Š M qq -4C (GeV) - y z Š MŒ -4C (GeV) ττ Haijun Yang Search for MSSM Higgs at LEP 8

20 ž Final Discriminant Calculation Compute the probability density function, } ~ L Ž ƒ j means event class(ha, WW, ZZ, qq etc.), i denotes certain variables(b-tag, 2-jet mass etc.). Derive figure of merit for event class j based only on variable i is defined as: Compute final event discriminant based on all variables and assume ha event class: šœ c ž _ () (2) Haijun Yang Search for MSSM Higgs at LEP 9

21 Final Discriminant of Tau Channel ~ } L ƒ 2 Data Background L ha bbττ(ττbb),90 GeV Events/ Final Discriminant Haijun Yang Search for MSSM Higgs at LEP 20

22 ² Candidate of ha Ÿ Q } ~ L Ž ƒ Run # 8652 Event # 280 Total Energy : 4.6 GeV P( muon) = 2.8 GeV/c E( jet2) = 52. GeV P( muon) =.7 GeV/c E( jet) = 60.0 GeV y z x Transverse Imbalance :.78 Longitudinal Imbalance : -.80 š c Thrust :.8667 Major :.4067 Minor :.25 = 0.9, ª «N = 0.965, ª.«N _ = 0.59, Event DAQ Time : i = GeV, ±_± = GeV. ² Ÿ ³µ ³ Ÿ Ÿ ( ¹ Ÿ º»»½¼ Haijun Yang Search for MSSM Higgs at LEP 2

23 Ò Ã Selection Results } ~ L ƒ Inte. Lumi. (¾À lá ALEPH DELPHI L PAL )  Á ha Äà ÆÅÈÇ Å ÉKÊ ËÍÌÎÌ ÏÑÐ Data Total Background Ò 4-fermion Bkgd Bkgd Efficiency 4% 25% % 4% Expected Signal The signal efficiency and rate are shown ²ÀÙ Ú Û Ü for Ó Ê Ô Ó Õ Ô Ö Ø, with Ý Þ ßà á â. Haijun Yang Search for MSSM Higgs at LEP 22

24 í í î î ó Confidence Level Calculation Likelihood Ratio test-statistic: ã ä åçæiè lé åçæ lé Monte Carlo experiments are based on Poisson statistics. Statistical Method: -2ln(Q) } ~ L Ž ƒ ic: observed s treated ent: Probability density signalbackground ê background : -CLë b CL sb ì í î ï ð ln(q) ïòñôó Haijun Yang Search for MSSM Higgs at LEP 2

25 A m L Result õö L ùø þ20 ÿbserved CL Median CL L tanβ ýü û4 2 ú ú0.9 ú0.8 ú ú 0.5 < GeV ú þ Excluded 95% C.L. Allowed Not allowed by theory û m h GeV ì ì Maximal Scenario obs / exp = 8.7 / 88. GeV obs / exp = 8.9 / 88. GeV Haijun Yang Search for MSSM Higgs at LEP 24

26 LEP Combined Results öõ L ùø -CL b LEP GeV Preliminary m h bserved Expected, Signal Expected, SM 5 σ m A (GeV/c 2 ) CL s LEP GeV Preliminary CL s = m h bserved Expected m A (GeV/c 2 ) maximal scenario, 20 Haijun Yang Search for MSSM Higgs at LEP 25

27 ì LEP Combined Results öõ L ùø tanβ LEP GeV Preliminary m h -max Excluded by LEP Theoretically Inaccessible m h (GeV/c 2 ) (GeV) ALEPH DELPHI L PAL obs. limit med. limit LEP Combined Results: 9.0 / 94.6 GeV. Haijun Yang Search for MSSM Higgs at LEP 26

28 ì LEP Combined Results öõ L ùø tanβ LEP GeV Preliminary m h -max M SUSY = TeV M 2 =200 GeV µ=-200 GeV m gluino =800 GeV Stop mix: X t =2M SUSY Excluded by LEP m A (GeV/c 2 ) (GeV) ALEPH DELPHI L PAL obs. limit med. limit LEP Combined Results: 9.9 / 95.0 GeV. Haijun Yang Search for MSSM Higgs at LEP 27

29 ì LEP Combined Results öõ L ùø tanβ LEP GeV Preliminary No Mixing Excluded by LEP Theoretically Inaccessible No Mixing Scenario ì ì m h (GeV/c 2 ) 9.5 / 95.0 GeV, for!" / 95. GeV, for #" $!" $ 9.6 is excluded Haijun Yang Search for MSSM Higgs at LEP 28

30 ' LEP Combined Results öõ L ùø Large % Scenario tanβ LEP GeV Preliminary Large Mu Scan Unexcluded M SUSY =400 GeV M 2 =400 GeV µ= TeV m gluino =200 GeV X( =-00 GeV t Excluded by LEP m A & (GeV/c 2 ) )* decays into,.-,0/"/ ñ 2 etc. Haijun Yang Search for MSSM Higgs at LEP 29

31 9 9 4 Charged Higgs Search Three final states: hadronic, semi-leptonic and leptonic decays. öõ L ùø 5 - e 5 e 6 γ / Z * H - H 8 τ 7 c, ν : s, τ - s :, τ 8 τ 7c, ν Haijun Yang Search for MSSM Higgs at LEP 0

32 4 Charged Higgs Search öõ L ùø ; < semi-leptonic decays. Haijun Yang Search for MSSM Higgs at LEP

33 4 Charged Higgs Search öõ L ùø ; < hadronic decays. Haijun Yang Search for MSSM Higgs at LEP 2

34 ì 4 Excess of Events at 68 GeV öõ L ùø % of ; < decay into =. Apparent excess at 68 GeV Haijun Yang Search for MSSM Higgs at LEP

35 ì 4 Excess of Events at 68 GeV öõ L ùø 4.2 > excess at 68 GeV from L. But... Haijun Yang Search for MSSM Higgs at LEP 4

36 ì ì ì ì 4 Exclusion Limits of Charged Higgs õö L ùø Br( ; <? =A@ = 0.0), B C 77.2 (77.) GeV. Br( ; <? =A@ = 0.), B C 66.9 (76.0) GeV. Br( ; <? =A@ = 0.5), B C 69.7 (75.7) GeV. Br( ; <? =D@ =.0), B C 82.7 (84.6) GeV. Haijun Yang Search for MSSM Higgs at LEP 5

37 ì H H LEP Combined Results öõ L ùø -CL b E - E -2 - E -4-5 E -6 bserved Expected background Expected signal LEP I Br(H τν)=0-7 F G m H (GeV/c 2 ) -CL b E - -2 E - -4 E -5 bserved Expected background Expected signal LEP I Br(H τν)= -6 E -7 F J G H m H (GeV/c 2 ) LEP Combined Data agree well with SM backgrounds Haijun Yang Search for MSSM Higgs at LEP 6

38 N P LEP Combined Results öõ L ùø Br(H τν) K0.8 K0.6 K0.4 Q LEP GeV K0.2 K0 L L M M N charged Higgs mass (GeV/c 2 ) R S T U 78.6 GeV at 95% C.L.. Haijun Yang Search for MSSM Higgs at LEP 7

39 ^ R R R Conclusions More than 200 _"`ba c data were collected per experiment in the Year In total d 700 _èa c were collected above f g pole by each experiment. No significant evidence of MSSM neutral and charged Higgs are observed up to h i 209 GeV. Neutral Higgs limits with 95% C.L. j k U lnmporq tvuxw y GeV, j s U lnmporl GeV is excluded from 0.5 to 2.4 Charged Higgs limits with 95% C.L. j S T U z {no~} GeV YXWV L ]\[ Z Haijun Yang Search for MSSM Higgs at LEP 8

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