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Paul Kienle Excellence Cluster Universe Technische Universität München

Role of Λ (1405) in the Formation of X(K - pp) from the Energy Dependence of the pp X+K + Reaction at 2.50 GeV and 2.85 GeV Inciden Energy. Paul Kienle Excellence Cluster Universe Technische Universität München. M²(p Λ ) and  M²(K+) Spectra : LAP, SAP.

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Paul Kienle Excellence Cluster Universe Technische Universität München

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  1. Role of Λ(1405) in the Formation of X(K-pp)fromtheEnergyDependence of theppX+K+Reactionat 2.50 GeV and 2.85 GeV IncidenEnergy Paul Kienle Excellence Cluster Universe Technische Universität München

  2. M²(pΛ) and M²(K+) Spectra: LAP, SAP M²(pΛ) and M²(K) spectrawith LAP cutsshowverysimilarbroadpeaksat 5.14 GeV/c²

  3. M(K+) Spectra for LAP and SAP For PT(p) > 0.3GeV/c an intensebroadpeakwith M = 2267 MeV/c² and  = 118 MeV isshown

  4. K+ Angular Distribution atTp = 2.85 GeV The K+ angular distributionswith LAP cutsshownoindication of high angular momentum transfer but hightransversemoment um transfer.

  5. Resultsfor pp  K+ + X at 2.85 GeV • Mass MX and widthX of „X“ • X productioncrosssection X  (Λ*)  0.20 x (Λtot)  large X formationispossibleforD(p-p and *-p)  1.7 fm X is a compactobject  Momentumtransfer For LAP pt  0.3 GeV/c  X is a compactobject  Large B and  only NY absorption  large X

  6. EnergyDependence of MissingMassM(pK+) Λ* productionat 2.50 GeV is 10% of theproductionat 2.85 GeV

  7. Invariant MassM(pΛ) Spectra at 2.85GeVand 2.50 GeV IncidentEnergy

  8. Total p+p Λ+p+K+ Cross SectionasFunction of Tp

  9. EnergyDependence of Reaction Cross SectionsEmpericalPredictions

  10. Relative Momentum of p-Λ* asFunction of Tp

  11. Λ*p StickingProbabilityasFunction of Tp M. Hassavand and Y. Akaishi priv. comminication

  12. Summary • In pp collisionstheratio of theproductioncrosssectionfor X(2265) RXobs=X(2.50)/X(2.85)=0.010.10 • RXexpected= X(2.50)/X(2.85)0.50 • RΛ*expected= Λ*(2.50)/Λ* (2.85)0.10exp. value • High formation of X(2265) requireshighΛ*p stickingprobabilitywhichrequireshighΛ*-p momentumavailableonlyatTp=2.85 GeV • High momentumΛ* in theentrancechannel form thecompact X(2265) in 2.85 GeV pp collisions • Thisis additional evidenceforthecompactness of X(2265)

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