摘要:

I reportBphysics results from the CLEO collaboration, highlighting measurements of the Cabibbo‐Kobayashi‐Maskawa matrix elements |Vcb| and |Vub|. I report a recent measurement of |Vub| through study of theq2dependence ofB¯→ &pgr;lv¯andB¯→ &rgr;lv¯. I also describe new measurements of the inclusive semileptonic branching fractionB(B¯ → Xev¯) and of moments of the hadronic invariant mass spectrum inB¯ → Xlv¯, with impact on |Vcb|. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1807287

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

We discuss recentBphysics results from DØ. The measurements presented here correspond to an integrated luminosity of ∼ 115 pb−1of data collected at the Tevatron, between April 2002 and June 2003, at a center of mass energy of thepp¯collision of 1.96 TeV. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1807288

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

We report on recent heavy quark results from CDF in Run II. We focus on a selection of mature analyses that demonstrate the capabilities of the experiment to extract interesting physics from the data. A few of the results presented have already been submitted for publication and papers are being prepared for most of the others. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1807289

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

We present a measurement of the time dependentCPasymmetries in the decayB0 → &fgr;Ks0using a sample of approximately 120 millionBB¯pairs collected with theBABARdetector at the PEP‐II asymmetric‐energyBmeson factory at SLAC. The values of theCP‐violating parameters derived from a time‐dependent fit to the&fgr;Ks0sample areC&fgr;K= −0.38 ± 0.37 ± 0.12 andS&fgr;K= 0.45 ± 0.43 ± 0.07, where the first uncertainty is statistical and the second systematic. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1807290

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

We report measurements of time‐dependentCPviolation in the neutralBmeson system using a data sample corresponding to 140 fb−1collected by the Belle detector at the KEKBe+e−collider. OneBmeson decaying into aCPeigenstate is fully reconstructed and the flavor of the accompanyingBmeson is identified by its decay products. TheCPviolation parameters are determined from the distribution of proper time intervals between the twoBdecays. Here, we cover a precise measurement of the Standard ModelCPviolation parameter sin(2&fgr;1), as well asCPasymmetry measurements in neutralBmeson decays intoJ/&psgr; &pgr;0and &pgr;+&pgr;−decays. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1807291

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

CDF and DØ are caught between the idealistic projections from the mid‐1990’s based on the Run I results and their TDR’s on one side, and realistic extrapolations from the recent Run II measurements on the other. In this paper, we report only on the latter, and describe recent progress in other areas. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1807292

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

The current status of some methods to determine the weak phase &ggr; of the Cabibbo‐Kobayashi‐Maskawa (CKM) matrix elementVub*usingBdecays is discussed, and comments are made on accuracy achievable in the next few years. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1807293

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

The main aim of the BaBar and Belle experiments is to test the Standard Model explanation ofCPviolation in theBsystem through measurements of the angles of the Unitarity Triangle. One angle (&bgr;/&fgr;1) is already well measured by the two collaborations. This paper describes some of the recent results from the two experiments from channels which are sensitive to the remaining angles. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1807294

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

I reviewCP‐violating signals of physics beyond the Standard Model in theBsystem. I examine the prospects for finding these effects at future colliders, with an emphasis on hadron machines. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1807295

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

Thebb¯production cross section has been measured in collisions of 920 GeV protons off a nuclei target using the HERA‐Bdetector. The identification ofbb¯events was done via inclusive bottom quark decays intoJ/&psgr; by exploiting the longitudinal separation of theJ/&psgr; →l+l−decay vertices from the primary proton nucleus interaction, where both the &mgr;+&mgr;−and thee+e−decay channels have been reconstructed. The first measurement, using data collected during a short period in 2000, yields a cross section in the combined analysis of&sgr;(bb¯) = 32−12+14(stat)−7+6(sys)nb/nucleon. On the most recent data samples taken in 2002/03, a much more accurate measurement with the uncertainties reduced to 10&percent; is expected. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1807296

出版商:AIP    

年代:1904

数据来源: AIP