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Status of Btev Experiment at the Fermilab Tevatron

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Status of Btev Experiment at the Fermilab Tevatron StatusStatus ofof BTeVBTeV experimentexperiment atat thethe FermilabFermilab TevatronTevatron Stefano Bianco Laboratori Nazionali di Frascati dell’INFN For the BTeV Collaboration S.B. - Status of BTeV@Tevatron - Physics at LHC, June 15th 2004, Vienna 1 OutlineOutline 1.Physics 2.Detector 3.Status and Schedule Due to limited time I shall only provide overview of the main features. Lots more details in recent talks by Sheldon Stone (DOE CD-1 Review April 2004), Joel Butler (Fermilab PAC June 2004), Penny Kasper (BEACH04, Chicago), Harry Cheung (WIN 2003), Rob Kutschke (Aspen Winter 2004). S.B. - Status of BTeV@Tevatron - Physics at LHC, June 15th 2004, Vienna 2 BTeVBTeV CollaborationCollaboration University of Minnesota Syracuse University- J. Hietala, Y. Kubota, B. M. Artuso, C. Boulahouache, Univ. of Illinois- M. Haney, D. Lang, R. Poling, A. Smith Belarussian State- D .Drobychev, Kim, M. Selen, V. Simatis, J. Wiss Nanjing Univ. (China)- S. Blusk, J. Butt, O. A. Lobko, A. Lopatrik, R. Zouversky Univ. of Insubria in Como- T. Y. Chen, D. Gao, S. Du, Dorjkhaidav, J. Haynes, N. UC Davis - P. Yager P. Ratcliffe, M. Rovere M. Qi, B. P. Zhang, Z. Xi Menaa, R. Mountain, Univ. of Colorado at Boulder INFN - Frascati-M.Bertani,L. Xang, J. W. Zhao H. Muramatsu, R. J. Cumalat, P. Rankin, K. Stenson Benussi, S. Bianco, M. Caponero, New Mexico State - Nandakumar, L. Redjimi, R. Fermi National Lab D. Collona, F. Fabri, F. Di Falco, V. Papavassiliou Sia, F. Felli, M. Giardoni, A. La J. Appel, E. Barsotti, C. Brown, Northwestern Univ. - T. Skwarnicki, S. Stone, J. C. Monaca, E. Pace, M. Pallota, A. J. Rosen J. Butler, H. Cheung, D. Christian, Wang, K. Zhang Paolozzi , S. Tomassini Ohio State University- S. Cihangir, M. Fischler, INFN - Milano – G. Alimonti, K. Honscheid, & H. Kagan Univ. of Tennessee I. Gaines, P. Garbincius, L. Garren, P’Dangelo, M. Dinardo, L. Edera, Univ. of Pennsylvania T. Handler, R. Mitchell E. Gottschalk, A. Hahn, G. Jackson, S. Erba, D. Lunesu, S. Magni, D. W. Selove Vanderbilt University Menasce, L. Moroni, D. Pedrini, P. Kasper, P. Kasper, R. Kutschke, Univ. of Puerto Rico W. Johns, P. Sheldon, S. Sala , L. Uplegger A. Lopez, H. Mendez, J. S. W. Kwan, P. Lebrun, P. McBride, E. Vaandering, & M. Webster INFN - Pavia - G. Boca, G. Ramierez, W. Xiong J. Slaughter, M. Votava, M. Wang, Cossali, G. Liguori, F. Manfredi, Univ. of Science & Tech. University of Virginia M. J. Yarba M. Maghisoni, L. Ratti, V. Re, M. of China - G. Datao, L. Hao, Arenton, S. Conetti, B. Cox, Univ. of Florida at Gainesville Santini, V. Speviali, P. Torre, G. Ge Jin, L. Tiankuan, T. A. Ledovskoy, H. Powell, M. P. Avery Traversi Yang, & X. Q. Yu Ronquest, D. Smith, B. University of Houston – IHEP Protvino, Russia - A. Shandong Univ. (China)- Stephens, Z. Zhe Derevschikov, Y. Goncharenko, A. Daniel, K. Lau, M. Ispiryan, C. F. Feng, Yu Fu, Mao He, Wayne State University V. Khodyrev, V. Kravtsov, A. J. Y. Li, L. Xue, N. Zhang, & G. Bonvicini, D. Cinabro, B. W. Mayes, V. Rodriguez, Meschanin, V. Mochalov, X. Y. Zhang S. Subramania, G. Xu D. Morozov, L. Nogach, P. Southern Methodist – A. Schreiner Illinois Institute of Technology Semenov K. Shestermanov, T. Coan, M. Hosack University of Wisconsin R. Burnstein, D. Kaplan, L. Soloviev, A. Uzunian, A. M. Sheaff Vasiliev University of Iowa L. Lederman, H. Rubin, C. White York University - S. Menary C. Newsom, & R. Braunger S.B. - Status of BTeV@Tevatron - Physics at LHC, June 15th 2004, Vienna 3 WhatWhat isis BTeV?BTeV? Tevatron p-p collider experiment, at Fermilab: ¾ Forward spectrometer @ C0 interaction region ¾ Beauty and charm physics: • Precision measurements of SM parameters • Exhaustive search for new physics. BTeV is a part of broad program to address fundamental questions in flavor physics. Details at: http://www-btev.fnal.gov. S.B. - Status of BTeV@Tevatron - Physics at LHC, June 15th 2004, Vienna 4 ProjectProject ScopeScope BTeV Detector C0 Hall BTeV Outfitting Detector BTeV Project C0 Interaction Region S.B. - Status of BTeV@Tevatron - Physics at LHC, June 15th 2004, Vienna 5 AA BriefBrief HistoryHistory ofof BTeVBTeV June 2000: Stage I approval from lab. Concerns raise about budget. May 2002: Stage I approval for descoped (2 armsÆ 1 arm) detector. October 2003: “P5 supports the construction of BTeV as an important project in the world-wide quark flavor physics area.” Office of Science – “Facilities for the Future of Science, a 20 year Outlook” – BTeV given priority 1 among HEP med-term projects 2004: DOE – approval process ¾ Completed reviews for first 2 stages with positive recommendations ¾ Final schedule and budget profile in the fall. ¾ DOE requires very conservative schedule – BTeV is still competitive in decay modes with all charged tracks and dominant in modes with neutrals. (PAC June 2004, P5 July 2004) June 2004: Italy’s INFN approves participation to BTeV(~5M Euro for M&S) Get CD-2/3 (~Jan 2005) and Start Construction (in President’s FY05 budget) Start data taking 2009 S.B. - Status of BTeV@Tevatron - Physics at LHC, June 15th 2004, Vienna 6 PhysicsPhysics GoalsGoals CP violation in SM is unique, predictive and testable Almost any extension of SM has new sources of CPV Measure ¾ CP violation in B(uds) , Bs mixing, rare b decay rates; ¾ CP violation and rare decays in the charm sector. § ÆRecent review on charm physics incl.CPV SB,F.L.Fabbri,D.Benson,I.Bigi, Riv.Nuovo Cim. 26 n.7-8 (2003) Precise measurement of SM parameters Make an exhaustive search for physics beyond SM ¾ Look for rare/forbidden decays ¾ Test for inconsistencies in the Standard Model: If found, go beyond the SM and elucidate the new physics. If/when new physics is found elsewhere, at the Tevatron or LHC, BTeV can contribute to its interpretation by looking for impact in B physics. BTeV is sensitive to phases of amplitudes. S.B. - Status of BTeV@Tevatron - Physics at LHC, June 15th 2004, Vienna 7 Key Measurements of the CKM matrix in B Decays ⎛ V *V ⎞ χ = arg⎜− cs cb ⎟ ⎜ * ⎟ ⎝ VtsVtb ⎠ About 1/2 of the key measurements are in Bs decays. About 1/2 of the key measurements have πo’s or γ’s in the final state! BTeV addresses these issues. S.B. - Status of BTeV@Tevatron - Physics at LHC, June 15th 2004, Vienna 8 Why do b and c Physics at Tevatron? Large samples of b quarks •Get ∼ 4×1011 b hadrons per 107s at L = 2×1032 cm-2s-1 •e+e- ϒ(4S) get 2×108 B hadrons per 107s at 1034 cm-2s-1 Λ Bs, b and other b-flavored hadrons are accessible for study at the Tevatron Charm rates are ∼ 10× larger than b rates Nominal Tevatron parameters : • CMS energy = 2 TeV • Peak Luminosity L = 2×1032 cm-2s-1 • Integrated luminosity 1.6 fb-1/year • Time/crossing = 396 ns σ σ µ • Interaction region z= 30cm and x,y= 50 m • bb cross section = 100 µb S.B. - Status of BTeV@Tevatron - Physics at LHC, June 15th 2004, Vienna 9 CharacteristicsCharacteristics ofof hadronichadronic bb productionproduction pp→bb+X The higher momentum b production peaks at large b’s are at larger η’s angles with large bb correlation βγ b pr od uc ti θ on angle η= -ln(tan ) a ction ng produ 2 le b S.B. - Status of BTeV@Tevatron - Physics at LHC, June 15th 2004, Vienna 10 Requirements:Requirements: GeneralGeneral Intimately tied to Physics Goals In general, within the acceptance of the spectrometer (10 – 300 mr with respect to beam) we need to: ¾ Detect charged tracks & measure their 3-momenta ¾ Measure the point of origin of the charged tracks (vertices) ¾ Detect neutrals & measure their 3-momenta ¾ Reveal the identity of charged tracks (e, µ, π, K, p) ¾ Trigger & acquire the data (DAQ) Detector we designed meets the requirements S.B. - Status of BTeV@Tevatron - Physics at LHC, June 15th 2004, Vienna 11 BasicsBasics ReasonsReasons forfor thethe RequirementsRequirements B’s (& D’s) are long lived, ~1.5 ps, so if they are moving with reasonable velocity they go ~3 mm before they decay. This allows us to Trigger on the the presence of a B decay (detached vertex). B’s are produced in pairs pp→bb+X, and for many crucial measurements we must detect one b fully and some parts of the other: “flavor tagging” Physics states of great interest now are varied and contain both charged modes and neutrals, Bd & Bs S.B. - Status of BTeV@Tevatron - Physics at LHC, June 15th 2004, Vienna 12 MoreMore BasicBasic ReasonsReasons Many modes contain γ, πo & η, so need excellent electromagnetic calorimetery Bs oscillations are fast, so need excellent time resolution ~<50 fs, compared to ~1500 fs lifetime. Also very useful to reduce backgrounds in reconstructed states Physics Backgrounds from π⇔K can be lethal → π− → − ¾ Bs Ds is 15X Bs Ds K + − ¾ Bo→K∗π→Kmπ±πo is 2X Bo→ρπ→π π πo ¾ Bs →KX coincides with Bd →πXif K ⇔ π ¾ Bd → Kπ overlaps Bd →ππ ¾ So excellent charged hadron identification is a must S.B. - Status of BTeV@Tevatron - Physics at LHC, June 15th 2004, Vienna 13 TheThe BTeVBTeV detectordetector inin thethe C0C0 collisioncollision hallhall S.B. - Status of BTeV@Tevatron - Physics at LHC, June 15th 2004, Vienna 14 TheThe BTeVBTeV DetectorDetector beam line p Pixel detector inside magnet, allows first level triggering, on detached vertices, since low pt tracks with large multiple scattering can be eliminated S.B. - Status of BTeV@Tevatron - Physics at LHC, June 15th 2004, Vienna 15 Summary of Required Measurements for CKM Tests Physics Decay Mode Vertex K/π γ det Decay Quantity Trigger sep time σ sin(2α) Bo→ρπ→π+π−πο 9 9 9 o + − + − sin(2α) B →π π & Bs→K K 9 9 9 cos(2α) Bo→ρπ→π+π−πο 9 9 9 sign(sin(2α)) Bo→ρπ & Bo→π+π− 9 9 9 − sin(γ) Bs→Ds K 9 9 9 sin(γ) Bo→Do K− 9 9 sin(γ) B→K π 9 9 9 sin(2χ) Bs→J/ψη′, J/ψη 9 9 9 o sin(2β) B →J/ψKs o cos(2β) B →J/ψK* & Bs→J/ψφ 9 − xs Bs→Dsπ 9 9 9 + − − ∆Γ for Bs Bs→J/ψη′, K K , Dsπ 9 9 9 9 S.B.
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