Download presentation

Presentation is loading. Please wait.

Published byAbner Newton Modified about 1 year ago

1
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 1 Towards to the TeV Scale Saleh Sultansoy TOBB ETÜ, Ankara & Fizika İnstitutu, Baku Introduction Periodic Table of the Elementary Particles The Fourth SM Family Higgs at the Tevatron and LHC RS-LSP Scenario Conclusion

2
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 2 Introduction →1930’s: e, p, n + + (Pauli) + (Yukawa) EM interactions mediated by Strong int-ns mediated by ± and Weak int-ns - Fermi (four-fermion contact) Leptons: e and Mesons: ± and Barions: p and n. Whole (visible) Universe is formed from a few particles: Nuclei are bound states of p’s and n’s, Atoms are bound states of nuclei and e’s etc. Chemistry became the Science… Whole technology of 20 th century is based on this picture.

3
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 3 This nice picture was destroyed in 1937 by the discovery of ! We were looked for –mesons but found something different. This new particle seems to be produced by strong interactions, but interacts with matter by EM interactions. Real –mesons were discovered 10 years later in emulsion experiments: e μ – e puzzle: why the Nature needs the second “heavy” electron … → 1960’s : hadron (meson and barion) inflation Quarks

4
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 4

5
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 5 ← First SM family ← three “massless” neutrinos ← three (or more) SM families

6
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 6 Black holes, Un-particles ?? Un-physics ???

7
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 7

8
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 8 TOBB ETÜ-

9
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 9 THERA projesi DESY’nin kapılarını açtı (1996 DESY-AÜ işbirliği anlaşması) QCD Explorer projesi CERN AB ve AT bölümlerinin kapılarını açtı ( TAEK projesi, TAEK projeleri) EPAC ve PAC ta tüm Türkiye çıkışlı makaleler linak-halka tipli lepton-hadron çarpıştırıcıları ve TAC projesi ile ilgilidir Kritik aşama: 1-3 Eylül 2008 de yapılacak ECFA-CERN çalıştayı

10
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 10 ↑ TAC

11
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 11 → 2000’s : Periodic Table of the Elementary * Particles family lud 1 < 3 eV (4) keV 1.5 to 4 MeV 4 to 8 MeV 2 < 190 keV (9) MeV 1.15 to 1.35 GeV 80 to 130 MeV 3 < 18.2 MeV (+29-26) GeV 174.3(5.1) GeV 4.1 to 4.4 GeV 4 > 45 GeV > 100 GeV > 200 GeV > 130 GeV * Elementary in the SM framework. At least one more level (preons) should exist. m = 0 (< 6 eV) m g = 0 (< few MeV) m W = (38) GeVm Z = (21) GeV m H > GeV Scale: 247 GeV

12
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep yüzyılın sonu: Kimyasal Elementlerin Mendeleyev Tablosu Anlaşılması: Rutherford deneyi → Atom modeli Enerji skalası MeV düzeyinde 1960’lar: Hadronların “Mendeleyev Tablosu” Anlaşılması: SLAC deneyleri → kuerk-parton modeli Enerji skalası GeV düzeyinde 20.yüzyılın sonu: Kuark, lepton ve ara bozonların “Mendeleyev Tablosu” Anlaşılması: LHC deneyleri → preon modeli? Enerji Skalası TeV ?? Düzeyinde Kuark ve leptonların karışımı yeni yapı düzeyinin en önemli belirtisidir !

13
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 13 Yukawa couplings In standard approach:m f = g f ( 245 GeV)g t / g e = 0 ( m t / m e ) Moreover, g t / g e 1.75 (if m e = 1 eV)compare with m GUT /m W ~ However, see-saw mechanism … For same type fermions:g t / g u , g b / g d 300 1500, g / g e 3500 Within third family: g t / g b 40,g t / g 100, g t / g et cetera Therefore, 3 family case is unnatural Hierarchy: m u m c m t m d m s m b m e m m

14
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 14 i) LEP data Three SM families with m (L) < m Z / 2 ii) Precision EW data 2000:the 4 th family excluded at 99% CL 2002:3 and 4 families have the same status 5 and even 6 families are allowed if m N 50 GeV 2004:6`th SM family is excluded at 3σ : ??? H.J. Su, N. Polonsky and S. Su, Phys. Rev. D 64 (2001) V.A. Novikov, L.B. Okun, A.N. Rosanov and M.I. Vysotsky, Phys. Lett. B 529 (2002)

15
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 15 Why the four SM families (S. Sultansoy, hep-ph/ ) Today, the mass and mixing patterns of the fundamental fermions are the most mysterious aspects of the particle physics. Even the number of fermion generations is not fixed by the Standard Model (N ≥ 3 from LEP, N ≤ 8 from Asymptotic Freedom). The statement of the Flavor Democracy (or, in other words, the Democratic Mass Matrix approach) H. Harari, H. Haut and J. Weyers, Phys. Lett. B 78 (1978) 459; H. Fritzch, Nucl. Phys. B 155 (1979) 189; B 184 (1987) 391; P. Kaus and S. Meshkov, Mod. Phys. Lett. A 3 (1988) 1251; H. Fritzch and J. Plankl, Phys. Lett. B 237 (1990) 451. which is quite natural in the SM framework, may be considered as the interesting step in true direction.

16
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 16 It is intriguing, that Flavor Democracy favors the existence of the fourth SM family H. Fritzsch, Phys. Lett. B 289 (1992) 92. A. Datta, Pramana 40 (1993) L503. A. Celikel, A.K. Ciftci and S. Sultansoy, Phys. Lett. B 342 (1995) 257. Moreover, Democratic Mass Matrix approach provide, in principle the possibility to obtain the small masses for the first three neutrino species without see-saw mechanism J. L. Silva-Marcos, Phys Rev D 59 (1999) The fourth family quarks, if exist, will be copiously produced at the LHC. ATLAS Detector and Physics Performance TDR, CERN/LHCC/99-15 (1999), p Then, the fourth family leads to an essential increase of the Higgs boson production cross section via gluon fusion at hadron colliders and this effect may be observed soon at the Tevatron.

17
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 17 Flavor Democracy and the Standard Model It is useful to consider three different bases: - Standard Model basis {f 0 }, - Mass basis {f m } and - Weak basis {f w }. According to the three family SM, before the spontaneous symmetry breaking quarks are grouped into the following SU(2) U(1) multiplets:

18
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 18 In one family case all bases are equal and, for example, d-quark mass is obtained due to Yukawa interaction where m d = a d /√2, = 247 GeV. In the same manner m u = a u /√2, m e = a e /√2 and m e = a e /√2 (if neutrino is Dirac particle). In n family case where d 1 0 denotes d 0, d 2 0 denotes s 0 etc. /√2

19
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 19 Flavor Democracy assumptions Before the spontaneous symmetry breaking all quarks are massless and there are no differences between d 0, s 0 and b 0. In other words fermions with the same quantum numbers are indistinguishable. This leads us to the first assumption, namely, Yukawa couplings are equal within each type of fermions: The first assumption result in n-1 massless particles and one massive particle with m = n·a F · /√2 (F = u, d, l, ) for each type of the SM fermions.

20
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 20 Because there is only one Higgs doublet which gives Dirac masses to all four types of fermions (up quarks, down quarks, charged leptons and neutrinos), it seems natural to make the second assumption, namely, Yukawa constants for different types of fermions should be nearly equal: This means that the n-th family (Dirac) fermions are almost degenerate m ln m un m dn m νn n a η / √2 For the third family we have: Therefore, the second assumption leads to the statement that according to the flavor democracy the fourth SM family should exist.

21
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 21 Above arguments, in terms of the mass matrix, mean Now, let us make the third assumption, namely, a /√2 is between e g w sin W and g z = g w /cos W. Therefore, the fourth family fermions are almost degenerate, in good agreement with experimental value = , and their common mass lies between 320 GeV and 730 GeV. The last value is close to the upper limit on heavy quark masses, m Q 700 GeV, which follows from partial-wave unitarity at high energies M.S. Chanowitz, M.A. Furlan and I. Hinchliffe, Nucl. Phys. B 153 (1979) 402 It is interesting that with value of a /√2 g w flavor democracy predicts m 4 8m W 640 GeV.

22
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 22 The masses of the first three family fermions, as well as an observable interfamily mixings, are generated due to the small deviations from the full flavor democracy A. Datta and S. Rayachaudhiri, Phys. Rev. D 49 (1994) S. Atag et al., Phys. Rev. D 54 (1996) A.K. Ciftci, R. Ciftci and S. Sultansoy, Phys. Rev. D 72 (2005) Last parameterization, which gives correct values for fundamental fermion masses, at the same time, predicts quark and lepton CKM matrices in good agreement with experimental data. Arguments against the Fifth SM Family The first argument disfavoring the fifth SM family is the large value of m t 175 GeV. Indeed, partial-wave unitarity leads to m Q 700 GeV 4 m t and in general we expect that m t m 4 m 5. Second argument: neutrino counting at LEP results in fact that there are only three "light" (2m m Z ) non-sterile neutrinos, whereas in the case of five SM families four "light" neutrinos are expected.

23
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 23 gg → H enhancement factor as a function of Higgs mass : four SM family case with m 4 = 200; 320 and 640 GeV (upper, mid and lower curves, respectively) E. Arik et al., Eur Phys J C 26 (2002) 9E. Arik et al., Phys Rev D 66 (2002) ; 5 and 6 SM families with infinite masses (lower, mid and upper curves) The Fourth SM Family and the Higgs Boson

24
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 24 Higgs decay branching ratios E. Arık, O. Çakır, S. A. Çetin, S. Sultansoy, Phys. Rev. D 66, (2002).

25
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 25 The Fourth SM Family at the Tevatron The fourth SM family (quarks) manifestations at the upgraded Tevatron: a)Significant enhancement (~8 times) of the Higgs boson production cross section via gluon fusion b)Pair production of the fourth family quarks (if m d4 and/or m u4 < 300 GeV) c)Single resonant production of fourth family quarks via the process qg q 4 (if anomalous coupling has sufficient strength)

26
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 26 DØ presentations, for example, A. Kharchilava, hep-ex/ W.-M. Yao, hep-ex/ V. Buscher, hep-ex/ E. Arik et al., hep-ex/ * means extra SM families with m N 50 GeV Tevatron 2004

27
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 27 Another opportunity to observe the fourth SM family quarks at the Tevatron is their anomalous production via qg-fusion if anomalous coupling has sufficient strength (f.e. g + u → u 4 → W + + b) E. Arik. O. Cakir and S. Sultansoy, Phys Rev D 67 (2003) Eur Phys Lett 62 (2003) 332 Eur Phys J C 39 (2005) 499 L int 2 fb -1 8 fb -1 SM-4150 GeV < m H < 180 GeV140 GeV < m H < 200 GeV SM-5135 GeV < m H 125 GeV < m H SM-4* GeV < m H < 195 GeV SM-5*155 GeV < m H 150 GeV < m H SM-6*150 GeV < m H 145 GeV < m H Accessible mass range of the Higgs boson at the Tevatron E. Arik et al, hep-ph/ (Feb 2005)

28
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 28 Tevatron

29
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 29 SM only a factor 4 away We exclude 4 th generation models, for which m H = GeV Results for H WW* (ICHEP-2006) Expected/Observed # of events for m H = 160 GeV (L ~ 950 pb -1 ): G. Bernardi, ICHEP-2006

30
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 30 We exclude 4 th generation models, for which m H = GeV or We exclude m H = GeV, if the 4 th generation exists Both statements at 95% CL (~2σ) + discrepancy between “expected” and “observed” limits

31
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 31 Existence of the fourth SM family can give opportunity for Tevatron to observe the intermediate mass Higgs boson before the LHC. However, LHC will cover whole region via “golden” mode during the first year of operation. E. Arik et al., Phys. Rev. D 66 (2002) gg → ZZ ( * ) → l + l - l + l - (l=e,μ)

32
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 32 Link to

33
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 33 Pair production at the LHC, 100 fb -1 E. Arik et al., Phys. Rev. D 58 (1998)

34
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 34 Future Studies for the LHC Reconsider pair production of 4-th family quarks (previous study in 1998) Impact of 4-th family on the Higgs boson searches in all channels Anomalous production and decays of 4-th family quarks Identification: u 4 vs Little Higgs t’ Identification: d 4 vs isosinglet D 4-th family leptons ?...

35
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 35 Flavor Democracy and the MSSM S. Sultansoy, hep-ph/ (2000); A.T. Alan and S. Sultansoy, J. Phys. G 30 (2004) 937. Usually either neutralino or gravitino are treated as the Lightest Supersymmetric Particle. Flavor Democracy permits for superparner of the right-handed neutrino to be an LSP. Then, tanβ ~ 40 if there are three (MS)SM families; Otherwise, the fourth family is nesessary if tanβ ~ 1.

36
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 36 Parameter Inflation

37
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 37 If neutrinos have Majorana nature then the total number of observable free parameters (including gauge sector) in the three family MSSM exceeds 200 ! (Therefore,) SUSY should be realized at the most fundamental (pre-)preonic level.

38
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 38 Sneutrino as the LSP

39
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 39

40
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 40

41
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 41 Flavor Democracy and tanβ

42
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 42 CONCLUSION (ATLAS) LHC ile ilgili yaptıklarımız ve yapacaklarımız: 1. 4-cü SM ailesi 2. Higgs bozonu 3. Isosinglet kuarklar 4. RS-LSP senaryosu 5. Preonik modeller

43
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 43 CONCLUSION (devam) 6. TIER2 → TIER1 7. SLHC T/DAQ Hardware (semiconductor detectors?) 8. QCD Explorer Hızlandırıcı Fizik Detektör 9. DİĞER SPL …

44
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 44 Backup slides

45
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 45 H WW* l l H + u 4 + d 4 factor ~3 in M CDF 2005 2006 Left: D0 Coll., Phys.Rev. Lett. 96 (2006) Right: CDF Coll., Phys. Rev. Lett (to be published)

46
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 46 The Fourth SM Family and Particle Factories

47
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 47 Breaking of the DMM A.K. Ciftci, R. Ciftci and S. Sultansoy, Phys. Rev. D 72 (2005)

48
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 48 Eigenvalues of matrix (19) give as the masses of the corresponding fermions which are used to fix the values of parameters α, β and γ.

49
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 49

50
Saleh SultansoyTR-ATLAS Grid Workshop Gaziantep 50

Similar presentations

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google