Measurements of $B_c^+$ production and mass with the $B_c^+ \to J/\psi \pi^+$ decay

Aaij, R; Abellan Beteta, C; Adametz, A; Adeva, B; Adinolfi, M; Adrover, C; Affolder, A; Ajaltouni, Z; Albrecht, J; Alessio, F

doi:10.1103/PhysRevLett.109.232001

Measurements of $B_c^+$ production and mass with the $B_c^+ \to J/\psi \pi^+$ decay

LHCb

Collaboration

Sep, 2012

15 pages

Published in:

Phys.Rev.Lett. 109 (2012) 232001

e-Print:

1209.5634 [hep-ex]

DOI:

10.1103/PhysRevLett.109.232001

PDG:

{{\mathit B}_{{{c}}}^{+}}

\rightarrow

{{\mathit J / \psi}{(1S)}}{{\mathit \pi}^{+}}

Report number:

LHCB-PAPER-2012-028,
CERN-PH-EP-2012-275

Experiments:

CERN-LHC-LHCb

View in:

pdf

reference search128 citations

Citations per year

Abstract: (arXiv)

Measurements of

B_c^+

production and mass are performed with the decay mode

B_c^+ \to J/\psi \pi^+

using 0.37 fb

^{-1}

of data collected in

pp

collisions at

\sqrt{s}=7

TeV by the LHCb experiment. The ratio of the production cross-section times branching fraction between the

B_c^+ \to J/\psi \pi^+

and the

B^+ \to J/\psi K^+

decays is measured to be

(0.68 \pm 0.10\,({\rm stat.}) \pm 0.03\,({\rm syst.}) \pm 0.05\,({\rm lifetime}))

% for

B_c^+

and

B^+

mesons with transverse momenta

p_{\rm T}>4

GeV/

c

and pseudorapidities

2.5<\eta<4.5

. The

B_c^+

mass is directly measured to be

6273.7 \pm 1.3\,({\rm stat.}) \pm 1.6 \,({\rm syst.})

MeV/

c^2

, and the measured mass difference with respect to the

B^+

meson is

M(B_c^+)-M(B^+) = 994.6 \pm 1.3\,({\rm stat.}) \pm 0.6\,({\rm syst.})

MeV/

c^2

.

Note:

14 pages including author list, 3 figures. v3, corrected the eaten "%" in the production ratio, only affects the arXiv abstract

13.85.Ni
14.40.Lb
14.40.Nd
mass difference: (B/c+ B+)
LHC-B
p p: interaction
B/c+: hadroproduction
B/c+: hadronic decay
J/psi(3100): leptonic decay
channel cross section: branching ratio: measured

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Measurements of Bc+B_c^+Bc+​ production and mass with the Bc+→J/ψπ+B_c^+ \to J/\psi \pi^+Bc+​→J/ψπ+ decay

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Measurements of $B_c^+$ production and mass with the $B_c^+ \to J/\psi \pi^+$ decay