# Presentation: 297526

## QCD Physics with BTeV

-   The main physics motivation for BTeV
-  CP Violation using b & c decays
-  Physics Beyond the Standard Model
-   Detector description
-   Expectations for QCD studies at BTeV

## CP Violation: A Fertile Frontier

- How did we become a matter (dominated) universe?

- Andrei Sakharov’s conditions (1967):

- q

- 

- q

- q

- 

- q

- Early Universe

- Now

-   nB/n  10 -9

- Standard
-  Model

- ?

- ?

- Get nB/n  10 -20

- New Physics beyond SM(!)

- Where to look!

-  Additional sources of CP violation

- Electroweak Baryogenesis

## Measurements of the CKM Matrix

- Can also measure
-   via B-DoK-

- Don’t just look (measure) under one lamp post!

- From Peskin hep-ph/0002041

-  Compare to the comprehensive tests of EW: repeat for quark flavour physics!

## Flavour Violation in Models           which address the Hierarchy

- SupersoftSUSY breakingDirac gauginos

- SM-like *B* physics                                                                 New Physics in *B* data

- MSSMMFVlow tan

- Generic  Little Higgs

- Generic  extra dim w SM in bulk

- SUSY GUTs

- Effective SUSY

- MSSMMFVlarge tan

- G. Hiller
- hep-ph/0308180

- Extra dim wSM on brane

- Little Higgs wMFV UV fix

## Physics Beyond the SM: LHC?

**New Physics**
**Parameter Space**

**Mass**

****

**LHC**

**~ TeV**

**B-Physics**

- Complementary knowledge from LHC and B Decays!

- Pictorial Example from Hewett (WIN03):

## BTeV at the Fermilab Tevatron

**p**

**p**

## BTeV Collaboration

**Belarussian State: **D .Drobychev,
- A. Lobko, A. Lopatrik, R. Zouversky
**UC Davis:**** **P. Yager
**Univ. of Colorado:**** **
- J. Cumalat, P. Rankin, K. Stenson
**Fermilab:**** **J.Appel, E.Barsotti,
- C.N.Brown, J.Butler, H.Cheung,
- D.Christian, S. Cihangir, M.Fishler,
- I.Gaines, P.Garbincius, L.Garren,
- E Gottschalk, A.Hahn, G.Jackson,
- P.A.Kasper, P.H.Kasper, R.Kutschke,
- S.Kwan, P. Lebrun,  P.McBride,
- J.Slaughter, M.Votava, M.Wang, J.Yarba
**Univ. of Florida:  **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.A.Burnstein, D.Kaplan, L.M.Lederman,
- H.A.Rubin, C.White
**Univ. of Illinois:****  **M.Haney, D.Kim,
- M.Selen, V. Simaitis, J.Wiss

**INFN - Frascati:**
- M. Bertani, L. Benussi, S. Bianco,
- M. Caponero, F. Fabbri, F. Felli,
- M. Giardoni,  A. La Monaca,
- E. Pace, M. Pallotta, A. Paolozzi
**INFN - Milano:** G.Alimonti,
- 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. Cosssali, G.  Liguori, F.Manfredi,
- M.Manghisoni, M.Marengo, L.Ratti,
- V. Re, M.Santini, V.Speziali,
- 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.N.Vasiliev
**Univ. of Insubria in Como****:**
- P. Ratcliffe, M. Rovere
**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 Zhang, J W.Zhao
**New Mexico State Univ.:**
- V.Papavassiliou
**Northwestern University:**
- J.Rosen
**Ohio State University****:            **K. Honscheid, & H. Kagan
**Univ. of Pennsylvania:**
- W. Selove
**Univ. of Puerto Rico:**
- A.Lopez, H.Mendez, J.E.Ramirez
- W. Xiong
**Univ. of Science & Tech. of China:** G. Datao, L. Hao, Ge Jin,
- 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 Univ:**
- T. Coan, M. Hosack

**Syracuse University:**
- M.Artuso, S.Blusk, J Butt,
- C.Boulahouache,
- O.Dorjkhaidav, J.Haynes, N.Menaa,
- R.Mountain, M.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
**Univ. 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. Shreiner
**University of Wisconsin:**
- M. Sheaff
**York University:** S. Menary

## 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- (4S) get 2108 B hadrons per 107s at 1034 cm-2s-1

-   Bs, b and other b-flavored hadrons are accessible
-     for study at the Tevatron
-   Charm rates are  10 larger than b rates

- Some assumed parameters for the Tevatron for simulations:
-   CMS energy = 2 TeV and L = 21032 cm-2s-1
-   Time/crossing = 396 ns
-   Interaction region z= 30cm and x,y= 50m
-   bb cross section = 100 b

## Why look in the Forward Region?

- BTeV detects in the forward region ( from 1.9 to 4.5)

- b production angle

- b production angle

-   Better decay length separation
-   Less multiple scattering

-   More BB in the Detector
-   Better away side tagging

- (-ln(tan[/2])

## The BTeV Detector

-   Vertex pixel (50m  400m)
-     detector in dipole magnet
-   RICH for particle ID
-   PbWO4 crystal EM calorimeter
-   Vertex separation Trigger at L1
-     (primary vertex reconstructed)
-   Powerful high speed DAQ
-     (output up to 4KHz)

- Main/Unique Features

## Implications for QCD Physics

-  Important BTeV detector features:
-  Excellent tracking 10 - 300 mrad (  1.9 - 5.3) for single tracks
-  Good (flat) acceptance down to small angles and small pT

- pT

- Acceptances for single tracks (lack of statistics at high pT):

- 

- pT

- xF

## Implications for QCD Physics

-  Important BTeV detector features:
-  Excellent tracking 10 - 300 mrad (  1.9 - 5.3)
-  Good acceptance down to small angles
-  Good acceptance for low pT tracks
-  EM PbWO4 crystal calorimeter (250 and 1I)
-  Excellent (multiple) photon detection and resolution
-  No Hadronic calorimeter, no 4 coverage
-  No jet studies? (jets with poor energy resolution)
-  No missing ET measurement, No rapidity-gap detection
-  Trigger on displaced tracks/vertices or muons only
-  Excellent heavy quark production and decay studies
-  No trigger for e.g. direct photon studies, diffractive, jets

## QCD Physics at BTeV

- Heavy quark production in the forward region:
-  Study region of (pT,y) complementary to CDF, D0 central detectors
-  Test QCD higher orders and fragmentation

- pT

- pT

- y

- y

- Distribution of reconstructed B mesons

- Trigger efficiency for B mesons flat
- (statistics limited)

## QCD Physics at BTeV

**From M.Albrow, “GTEV”, DESY, Mar. 2004**

- Heavy quark production in the forward region:
-  Probe PDF’s at low and high xBj

- pT

- pT

- xF

- xF

- Distribution of reconstructed B mesons

- Trigger efficiency for B mesons flat
- (statistics limited)

## QCD Physics at BTeV

- Heavy quark production - bb correlations (, y, pT,...)
-  Sensitive to higher order QCD contributions & low x in PDF(?)
-  Less model dependence in QCD predictions(?)
- Our studies concentrated on rare decays and tagging, but...
-  Estimate ~107 fully reconstructed B mesons (in 2 fb-1)
-                 ~106 fully recon. B + opposite tagged B (not a jet)
-                 ~103 fully recon. BB + BB  (c.f. 105-106 di-b-jets CDF/D0)
-                 ~104-105 fully reconstructed DD (depends on trigger)
- Could also look at bb or bb events (besides from B mixing)
-  E.g. due to gluon splitting in fragmentation
-  SUSY g  bb (~c.f. done at Run I and Run II?)

## QCD Physics at BTeV

- Drell-Yan processes as probes of PDF (not direct photon)
-  Possible to trigger, but backgrounds unknown at low dilepton mass
- Production of J/ and  in the forward region
-  Useful in discriminating NRQCD vs CEM, colour-singlet vs octet?
-  Can reconstruct excited states of cc and bb (different JP) using ’s
- Heavy quark spectroscopy (excellent  det. and particle ID)
-  Bc spectroscopy and decays, ~104 fully reconstructed (~103 Run II)
-  Spectroscopy of other b and c hadrons (many excited states)
-  Light quark spectroscopy via B and D meson decays

## QCD Physics at BTeV

- Search/measure more exotic quark states
-  Must be able to trigger on these states (lifetime or muons in decay)
-  qqQ and qQQ and even QQQ baryons
-  pentaquarks and tetraquarks with b and c quarks
- More QCD Physics at BTeV?
-  Besides concerns of uncertainties in extracting CP-violating/CKM    measurements in B decays, not much focus on possible QCD physics
-  Not trying to sell QCD physics at BTeV, but this is an excellent opportunity to see what could be measured at BTeV and get collaborators who might want to do this type of physics

## Summary

- BTeV is a proposed experiment to study CP violation, rare and forbidden b & c decays in the forward region
- Goal for BTeV is to discover New Physics, or help interpret New Physics found elsewhere, using b & c decays; &
- Measure Standard Model “fundamental constants”
- Although QCD physics has not been a focus for BTeV there will be many interesting areas of study due to detection in the forward region, excellent photon detection & particle ID, and excellent efficiency for b & c hadron reconstruction
- This is an excellent opportunity to see if BTeV can do the type of QCD physics you are interested in.

## Proceed to Backup Slides

## Brief History and Status of BTeV

-  May 1997 - EOI, 161 pages
-  Dec. 1997 - Addendum, 62 pages - address PAC concerns
-          BTeV becomes a R&D project
-  May 1999 - Preliminary TDR, 373 pages (full BTeV)
-  May 2000 - Proposal, 429 pages, submitted to Fermilab
-    June 2000  PAC unanimously recommends Stage 1 approval
-                      Approval from Director (2-arm)
-  Mar. 2002 - Proposal update, 126 pages (request from Lab, 1-arm)
-           PAC unanimously recommends approval of descoped BTeV
-           Approval from Director (1-arm)
-  Oct. 2002 - Fermilab conducts cost review of BTeV (Temple)
-  Mar. 2003 - Review of BTeV by P5
-     Oct. 2003 - P5 supports building BTeV and recommends earliest construction
-  Mar. 2004 - Temple review of BTeV cost range and schedule range
-        ......

## Continual and Growing interest in BTeV

-   Despite long review and approval process and problems for
-     universities getting funding (e.g. for R&D):

-  There is very strong interest in the physics and technology of BTeV

- Most of these are senior members - expect to grow to 300.

**BTeV Collaborators**

## Schedule

-   If we get DOE approval and funding:

-   We welcome new collaborators!

- We are very excited about BTeV and eager to get construction funded and started!