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The Btev Experiment The BTeV Experiment Jianchun Wang Syracuse University Representing the BTeV Collaboration 05/17/2002, FPCP Conference, Philadelphia, PA Outline • Physics Goal • The one-arm spectrometer • Physics sensitivities • Status BTeV—as of March 2002 Belarussian State- D .Drobychev, Univ. of Illinois- M. Haney, D. Morozov, L. Nogach, K. Southern Methodist A. Lobko, A. Lopatrik, R. Zouversky D. Kim, M. Selen, J. Wiss Shestermanov, L. Soloviev, A. University - T. Coan Uzunian, A. Vasiliev UC Davis - P. Yager Univ. of Insubria in Como- SUNY Albany - M. Alam P. Ratcliffe, M. Rovere University of Iowa Univ. of Colorado-J. Cumalat C. Newsom, & R. Braunger Syracuse University INFN - Frascati- M. Bertani, Fermi National Lab University of Minnesota M. Artuso, S. Blusk, C. L. Benussi, S. Bianco, M. Caponero, Boulahouache, O. Dorjkhaidav, K. J. Appel, E. Barsotti, C. N. Brown , V. V. Frolov, Y. Kubota, R. Poling, F. Fabbri, F. Felli, M. Giardoni, Khroustalev, R.Mountain, N. Raja, T. & A. Smith J. Butler, H. Cheung, G. Chiodini, A. La Monaca, E. Pace, M. Pallotta, Skwarnicki, S. Stone, J. C. Wang Nanjing Univ. (China) D. Christian, S. Cihangir, R. Coluucia, A. Paolozzi Univ. of Tennessee I. Gaines, P. Garbincius, L. Garren, T. Y. Chen, D. Gao, S. Du, M. Qi, INFN - Milano - G. Alimonti, P. B. P. Zhang, Z. Xi Zhang, J. W. T. Handler, R. Mitchell E. Gottschalk, A. Hahn, P. Kasper, D’Angelo, L. Edera , S. Magni, D. Zhao Vanderbilt University P. Kasper, R. Kutschke, S. Kwan, Menasce, L. Moroni, D. Pedrini, Ohio State University W. Johns, P. Sheldon, K. Stenson, E. P. Lebrun, P. McBride, M. Votava, S.Sala, L. Uplegger K. Honscheid, & H. Kagan Vaandering, & M. Webster M. Wang, J. Yarba INFN - Pavia - G. Boca, Univ. of Pennsylvania Univ. of Virginia: Univ. of Florida at Gainesville G. Liguori, & P. Torre M. Arenton, S. Conetti, B. Cox, W. Selove INFN - Torino – P. Avery Univ. of Puerto Rico A. Ledovskoy R. Arcidiacono, S. Argiro, University of Houston A. Lopez, & W. Xiong Wayne State University S. Bagnasco, N. Cartiglia, R. Cester, M. Bukhari, K. Lau, B. W. Mayes, G. Bonvicini, & D. Cinabro, F. Marchetto, E. Menichetti, Univ. of Science & Tech. of V. Rodriguez, S. Subramania A. Shreiner R. Mussa, N. Pastrone China - G. Datao, L. Hao, Ge Jin, Illinois Institute of Technology T. Yang, & X. Q. Yu University of Wisconsin IHEP Protvino, Russia Shandong Univ. (China)- C. R. A. Burnstein, D. M. Kaplan, M. Sheaff A. Derevschikov, Y. Goncharenko, F. Feng, Yu Fu, Mao He, J. Y. Li, L. M. Lederman, H. A. Rubin, V. Khodyrev, V. Kravtsov, A. L. Xue, N. Zhang, & X. Y. Zhang York University C. White Meschanin, V. Mochalov, S. Menary 2 Physics Goals ²BTeV is designed to search for physics beyond Standard Model and make precise measurements of SM parameters. ²The important measurements to make involve mixing, CP violation and rare decays of hadrons containing b or c quarks, especially: o o ® CP violation in B , Bs and D mesons. ® Bs mixing and DGs. ® Rare b decays. A window to new physics 3 The CKM Matrix and Phases ² The CP violation in the SM originates from quark mixing. ² The Unitarity of the CKM matrix allows us to construct 6 c¢ triangles, the most common beauty triangle is the bd triangle. ² The primary goal is to measure c CKM phases: a, b, g, c. ² It is also important to measure the lengths of the sides g (magnitudes). b a ² It is important to remove the 4- fold ambiguity generated by Constraint: a+b+g=p sin(2f)®f. 4 Required Measurements for CKM Tests Physics Decay Mode Vertex K/p g det Decay Quantity Trigger sep time s sin(2a) Bo®rp®p+p-po ü ü ü o + - + - sin(2a) B ®p p & Bs®K K ü ü ü cos(2a) Bo®rp®p+p-po ü ü ü sign(sin(2a)) Bo®rp & Bo®p+p- ü ü ü - sin(g) Bs®Ds K ü ü ü sin(g) Bo®Do K- ü ü sin(g) B®K p ü ü ü sin(2c) Bs®J/yh¢, J/yh ü ü ü o sin(2b) B ®J/yKs o cos(2b) B ®J/yK* & Bs®J/yf ü - xs Bs®Dsp ü ü ü + - - DG for Bs Bs®J/yh¢, K K , Dsp ü ü ü ü The BTeV detector is unique that satisfies all these requirements. 5 A Forward Detector at pp Collider Forward region, 10 - 300 mrad, 1.5 <| h |<3.5 The higher momentum b b production peaks at large are at larger h angles with large bb correlation BTeV bg b production Pseudo-rapidity h angle b production angle 6 The Tevatron as b & c Source Luminosity 2´1032 cm-2s-1 b cross-section 100 µb # of b-pairs per 107 sec 2´1011 b fraction 1/500 c cross-section >500 µb Bunch Spacing 132 ns Luminous region length sz = 30 cm Luminous region width sx ~ sy ~ 50 µm Interactions/crossing <2> 7 The BTeV Spectrometer 8 The BTeV Pixel Detector ³ Provides extremely high quality precision space points for vertex reconstruction, which are also used in 30 2-plane pixel the detached vertex trigger. stations ³ Reasons for pixel detector: ® Superior signal to noise. ® Excellent spatial resolution (5-10 mm). ® Very low occupancy. ® Radiation hard. 0.5 cm ® Very fast. ³ Special features: ® Directly used in the level 1 trigger. ® Pulse height is measured on every channel with a 3-bit FADC. Pixels size: 50 mm ´ 400 mm ® It is inside a dipole and gives a standalone momentum. 9 Performance of the Pixel Detector Spatial Resolution from B°® p+p- Beam Test 1999 <L>/sL=36 at pB=30GeV PB distribution (cm) L s Decay length error pB (GeV) Large Ldecay / sL is critical for b experiment 10 Ring Imaging Cherenkov Detector Cherenkov angle vs P Liquid C5F12 (n=1.24) Gas C4F10 (n=1.00138) The RICH provides identification of kaons and pions. It is essential to CP violation study 11 Lepton Identification Using RICH ²While the full detector aperture is 300 mr, the acceptance of the electromagnetic calorimeter and muon detector is only ~200 mr. ²The RICH, however, has both e/p and m/p discrimination at low momentum. The wide angle particles are mostly at low momentum! B®J/yX 4s 12 Electromagnetic Calorimeter ²EM calorimeter for g/p° reconstruction and electron ID. ²10,000 PbWO4 crystal (rad hard) with PMT readout 2 2 ²Lateral size: 27.2´27.2mm (front), 28´28mm (back), Length 22cm (25 X0) ²Resolution: sE/E = 0.8% for g in B®K*g, sM = 2.6 MeV for 10 GeV p°. ²Sample crystals tested in a beam at Protvino. 13 Detached Vertex Trigger ¯ Idea: finds the primary vertex, selects events that have additional tracks miss it ¯ Requirement: at least 2 tracks detached by more than 6s Þ 1% minimum bias at level 1 trigger. ¯ Refined reconstruction at level 2 and 3. ¯ With 3-level trigger scheme, the event rate: 7.6 MHz Þ 3 kHz ¯ Efficiency: (after the other analyses cuts) State efficiency(%) State efficiency(%) B ® p+p- 63 Bo ® K+p- 63 o Bs ® DsK 71 B ® J/y Ks 50 - o - * B ® D K 70 Bs ® J/yK 68 - - o o o B ® Ksp 27 B ® r p 56 14 Physics Reach (CKM) in 107 s Reaction B (B)(x10-6) # of Events S/B Parameter Error or (Value) Bo®p+p- 4.5 14,600 3 Asymmetry 0.030 - o Bs® Ds K 300 7500 7 g 8 o + - B ®J/y KS J/y ®l l 445 168,000 10 sin(2b) 0.017 - Bs® Ds p 3000 59,000 3 xs (75) B-®Do (K+p-) K- 0.17 170 1 o B-®Do (K+K-) K- 1.1 1,000 >10 g 13 - - o B ®KS p 12.1 4,600 1 <4 + Bo® K+p- 18.8 62,100 20 g theory errors Bo®r+p- 28 5,400 4.1 Bo®ropo 5 780 0.3 a ~4o B ®J/y h, 330 2,800 15 s J/y ®l+l- Bs®J/y h¢ 670 9,800 30 sin(2c) 0.024 Critical check to the SM 15 Critical Checks Using c ²Silva & Wolfenstein (hep-ph/9610208), (Aleksan, Kayser & London), propose a test of the SM, that can reveal new physics; it relies on measuring the angle c. ® BTeV can use CP eigenstates in Bs decay to measure c, for ( ) example Bs®J/yh ¢ , h®gg, h¢®rg ® Can also use J/yf, but need a complicated angular analysis ® The critical check is sinbgsin sin ? = l 2 sin()bg+ ® Very sensitive since l =0.2205±0.0018 ® Since c ~ 0.03, need lots of data 16 Rare b Decays ²Sensitive to high mass gauge bosons and fermions. It is a good place to find new physics. ²Exclusive Rare Decays such as B®rg, B®K*l+l-: Dalitz plot & polarization ²Inclusive Rare Decays such as inclusive b®sg, b®dg, b®sl+l- Reaction B (10-6) Signal S/B Physics /Year Bo®K*om+m- 1.5 2530 11 polarization & rate B-®K-m+m- 0.4 1470 3.2 rate g, + - l l b®sm+m- 5.7 4140 0.13 rate: Wilson coefficents 17 MSSM Measurements (from Hinchcliff & Kersting hep-ph/0003090) ²Contributions to Bs mixing Bs®J/yh CP asymmetry » 0.1sinfmcosfAsin(Dmst), ~10 x SM uContributions to direct CP violating decay B-®fK- 2 Asym=(MW/msquark) sin(fm), ~0 in SM 18 Reconstructed Events in New Physics Modes: Comparison of BTeV with B-factories Mode BTeV (107s) B-fact (500 fb-1) Yield Tagged S/B Yield Tagged S/B ( ) Bs®J/yh¢ 12650 1645 >15 - - B-®fK- 6325 6325 >10 700 700 4 o B ®fKs 1150 115 5.2 250 75 4 Bo®K*m+m- 2530 2530 11 ~50 ~50 3 + - Bs® m m 6 0.7 >15 0 Bo®m+m- 1 0.1 >10 0 D*+®p+Do, Do®Kp+ ~108 ~108 large 8x105 8x105 large 19 Specific Comparisons with LHC-b Yields in two final states Mode BR BTeV LHC-b Yield S/B Yield S/B - -4 Bs® Ds K 3.0x10 7530 7 7660 7 Bo®r+p- 2.8x10-5 5400 4.1 2140 0.8 Bo®ropo 0.5x10-5 776 0.3 880 not known 20 Status ²BTeV received a second unanimous approval by the Fermilab PAC (4/2002).
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