1. BTeV forever1 BTeV The final aim of BTeV experiment is to search for New Physics in the Heavy Flavor sector, b and c We could either discover it or contribute to individuate the New Model generating it, if discovered elsewhere (LHC) –Each New Model impacts the HF measurements with different patterns –and these could be the only way to distinguish among them To succeed in this, BTeV exploits the huge potential of the Tevatron collider in terms of produced b –  4  10 11 b-hadrons per 10 7 s at L = 2  10 32 cm -2 s -1 –All the b-hadron species are produced: B, B s, B c,  b, …

2. 2 BTeV Collaboration Belarussian State- D.Drobychev, A. Lobko, A. Lopatrik, R. Zouversky UC Davis - P. Yager Univ. of Colorado at Boulder J. Cumalat, P. Rankin, K. Stenson Fermi National Lab J. Appel, E. Barsotti, C. Brown, J. Butler, H. Cheung, D. Christian, S. Cihangir, M. Fischler, I. Gaines, P. Garbincius, L. Garren, E. Gottschalk, A. Hahn, G. Jackson, P. Kasper, P. Kasper, R. Kutschke, S. W. Kwan, P. Lebrun, P. McBride, J. Slaughter, M. Votava, M. Wang, J. Yarba Univ. of Florida at Gainesville P. Avery University of Houston – A. Daniel, K. Lau, M. Ispiryan, B. W. Mayes, V. Rodriguez, S. Subramania, G. Xu Illinois Institute of Technology R. Burnstein, D. Kaplan, L. Lederman, H. Rubin, C. White Univ. of Illinois- M. Haney, D. Kim, M. Selen, V. Simatis, J. Wiss Univ. of Insubria in Como- P. Ratcliffe, M. Rovere INFN - Frascati- M. Bertani, L. Benussi, S. Bianco, M. Caponero, D. Collona, F. Fabri, F. Di Falco, F. Felli, M. Giardoni, A. La Monaca, E. Pace, M. Pallota, A. Paolozzi, S. Tomassini INFN - Milano – G. Alimonti, P’Dangelo, M. Dinardo, L. Edera, S. Erba, D. Lunesu, S. Magni, D. Menasce, L. Moroni, D. Pedrini, S. Sala, L. Uplegger INFN - Pavia - G. Boca, G. Cossali, G. Liguori, F. Manfredi, M. Maghisoni, L. Ratti, V. Re, M. Santini, V. Speviali, P. Torre, G. Traversi IHEP Protvino, Russia - A. Derevschikov, Y. Goncharenko, V. Khodyrev, V. Kravtsov, A. Meschanin, V. Mochalov, D. Morozov, L. Nogach, P. Semenov K. Shestermanov, L. Soloviev, A. Uzunian, A. Vasiliev University of Iowa C. Newsom, & R. Braunger University of Minnesota J. Hietala, Y. Kubota, B. Lang, R. Poling, A. Smith Nanjing Univ. (China) - T. Y. Chen, D. Gao, S. Du, M. Qi, B. P. Zhang, Z. Xi Xang, J. W. Zhao New Mexico State - V. Papavassiliou Northwestern Univ. - J. Rosen Ohio State University- K. Honscheid, & H. Kagan Univ. of Pennsylvania W. Selove Univ. of Puerto Rico A. Lopez, H. Mendez, J. Ramierez, W. Xiong Univ. of Science & Tech. of China - G. Datao, L. Hao, Ge Jin, L. Tiankuan, T. Yang, & X. Q. Yu Shandong Univ. (China) - C. F. Feng, Yu Fu, Mao He, J. Y. Li, L. Xue, N. Zhang, & X. Y. Zhang Southern Methodist – T. Coan, M. Hosack Syracuse University- M. Artuso, C. Boulahouache, S. Blusk, J. Butt, O. Dorjkhaidav, J. Haynes, N. Menaa, R. Mountain, H. Muramatsu, R. Nandakumar, L. Redjimi, R. Sia, T. Skwarnicki, S. Stone, J. C. Wang, K. Zhang Univ. of Tennessee T. Handler, R. Mitchell Vanderbilt University W. Johns, P. Sheldon, E. Vaandering, & M. Webster University of Virginia M. Arenton, S. Conetti, B. Cox, A. Ledovskoy, H. Powell, M. Ronquest, D. Smith, B. Stephens, Z. Zhe Wayne State University G. Bonvicini, D. Cinabro, A. Schreiner University of Wisconsin M. Sheaff York University - S. Menary

3. BTeV forever3 b-physics in the forward region BTeV covers the p-bar forward region, where the b production peaks –1.9<  <4.5 The higher b momenta limit MCS effects & boost the b/  b values The strong b b-bar angular correlation makes the flavor tagging much easier b production angle  -ln(tan )  2

4. BTeV forever4 Pixel detector inside magnet, allows for first level triggering, on detached vertices, since low p t tracks with large multiple scattering can be eliminated beam line p

5. BTeV forever5 Pixel Vertex Detector Low occupancy Excellent signal/noise Fast readout Excellent resolution (5-10  m in 1999 FNAL test beam run) radiation hard sensors and readout chips (demonstrated in exposures at IUCF) Allows for Vertex Trigger at the lowest level 4.25 cm 30 stations, 130cm

6. BTeV forever6 BTeV L1 Vertex Trigger Performs a real-time full reconstruction of tracks and vertices of each collision to look for secondary vertices Trigger decision –based on the number of tracks having an impact parameter significance b/  b > n For a requirement of at least 2 tracks detached by more than 4 , we trigger on only 1% of the beam crossings and achieve the following efficiencies for these states at Level 1: b,b/  b State efficiency(%) state efficiency(%) B   +  - 55 B o  K +  - 54 B s  D s K 70 B o  J/  K s 50 B -  D o K - 60 B s  J/  K * 69 B -  K s  - 40 B o  K * 

7. BTeV forever7 Forward Tracker Very solid and redundant system with Straws at large angles and Micro-strip in the inner region around the beam pipe –7 stations with 3 views, X, U and V –Achieves a momentum resolution < 1% Here is where the Italian construction effort is concentrated

8. BTeV forever8 RICH: Two systems Gas + Mirror + MAPMT to identify b decay products Liquid + PMT’s to help with flavor tagging of b’s (p/K separation for p < 9 GeV/c) Excellent particle id. distinguishes BTeV from “Central pp Detectors”

9. BTeV forever9 PbWO 4 EM Calorimeter Use CMS development of crystal technology. Now used for CMS, ALICE, JLAB, etc… Use Photomultiplier tubes instead of APD’s Excellent performance in energy resolution Together with the pixel vertex trigger, one of the unique feature of BTeV Allows BTeV to make precision measurement of modes involving  and  0

10. 10 Some of BTeV’s Physics Reach in 2 fb -1 (CKM) Reaction B (B)(x10 -6 ) # of EventsS/B Parameter Error or (Value) Bo+-Bo+- 4.5 14,600 3 Asymmetry 0.030 B s  D s K - 300 7500 7  8 o B o  J/  K S J/  l + l  - 445 168,000 10 sin(2  ) 0.017 B s  D s  - 3000 59,000 3 x s (75) B -  D o (K +  - ) K - 0.17 170 1 B -  D o (K + K - ) K - 1.1 1,000>10  13 o B-KS -B-KS - 12.1 4,600 1 <4 o + B o  K +  - 18.8 62,100 20  theory errors Bo+-Bo+- 28 5,400 4.1 BoooBooo 5 780 0.3  ~4 o B s  J/  330 2,800 15 B s  J/  670 9,800 30 sin(2  0.024 Just because a mode isn’t listed, doesn’t mean we can’t do it!