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Romero, B. Adeva, O. Vázquez Doce University of Santiago de Compostela

Romero, B. Adeva, O. Vázquez Doce University of Santiago de Compostela. IH and SFD hits are associated to upstream tracks (MSGC). Define upstream mass for individual IH and SFD TDC hits :. where Δ t = corrected time-of-flight between IH or SFD and VH. Pion (  +  - ) signal veto cuts :

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Romero, B. Adeva, O. Vázquez Doce University of Santiago de Compostela

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  1. Romero, B. Adeva, O. Vázquez Doce • University of Santiago de Compostela

  2. IH and SFD hits are associated to upstream tracks (MSGC) Define upstream mass for individual IH and SFD TDC hits : where Δt = corrected time-of-flight between IH or SFD and VH Pion (+ -) signal veto cuts : (around Kaon mass) Actual mass measurement : TWO METHODS HAVE BEEN USED TO ISOLATE THE K+K- SIGNAL : Prompt events with p<1.5 GeV/c • independent detectors used , very small background correlation • charge confusion is irrelevant with equal-mass pairs

  3. MAXIMUM LIKELIHOOD FIT • is + - fraction 1- is K+ K- the fraction R(x) is the squared-mass resolution function: R(x) is:  detector group dependent  approximately mass-scale independent  non-symmetric around peak value in general

  4. All upstream TDC detectors (IH and SFD) are used to measure the squared-mass

  5. Coulomb interaction of detected K+K- pairs is strong as expected Q-values calculated under K+K- hypothesis Monte Carlo Sakharov factor with correct Bohr momentum

  6. Yet another method: distinguish between positive and negative masses K+K- signal Caveat : underlying correlation due to IH slab width

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