A search for the decay of the {tau} lepton to seven charged pions and at most one {pi}{sup 0} was performed using the BABAR detector at the PEP-II e{sup +}e{sup -} collider. The analysis uses data recorded on and near the {Upsilon}(4S) resonance between 1999 and 2003, a total of 124.3 fb{sup -1}. They observe 7 events with an expected background of 11.9 {+-} 2.2 events and calculate a preliminary upper limit of BR({tau}{sup -} {yields} 4{pi}{sup -} 3{pi}{sup +}({pi}{sup 0}){nu}{sub {tau}})

We have searched for the decay of the[tau] lepton into seven charged particles and zero or one[pi][sup 0]. The data used in the search were collected with the CLEO II detector at the Cornell Electron Storage Ring (CESR) and correspond to an integrated luminosity of 4.61 fb[sup 1]. No evidence for a signal is found. Assuming all the charged particles are pions, we set an upper limit on the branching fraction, B([tau][sup -][yields] 4[pi][sup -]3[pi][sup+]([pi][sup 0])[nu][sub[tau]])

The {tau}{sup -} {yields} {pi}{sup -}{pi}{sup -}{pi}{sup +}{pi}{sup 0}{pi}{sup 0}{nu}{sub {tau}} and {tau}{sup -} {yields} 3h{sup -} 2h{sup +} {nu}{sub {tau}} decays have been studied using the BABAR experiment at the PEP-II e{sup +}e{sup -} storage ring. Preliminary branching fractions are given for the {tau}{sup -} {yields} {pi}{sup -}{pi}{sup -}{pi}{sup +}{pi}{sup 0}{pi}{sup 0}{nu}{sub {tau}} and to the sub-channels {tau}{sup -} {yields} {eta}{pi}{sup -} {pi}{sup 0}{nu}{sub {tau}} and {tau}{sup -} {yields} {omega}(782){pi}{sup -}{pi}{sup 0}{nu}{sub {tau}}. A preliminary upper limit is given on the branching fraction for the {phi}(1020){pi}{sup -}{pi}{sup 0}{nu}{sub {tau}} mode. In addition a preliminary measurement of the branching fraction of the {tau}{sup -} {yields} 3h{sup -}2h{sup +} {nu}{sub {tau}} decay (h = {pi}, K) is presented.

A search for the decay of the? lepton to seven charged pions and one or zero?° mesons was performed using the BABAR detector at the PEP-II asymmetric-energy ee− collider. The analysis uses 232.2 fb−1 of data at center-of-mass energies on or near the?(4S) resonance. We observe 24 events with an expected background of 21.6 ± 1.3 events. Without evidence for a signal, we calculate an upper limit of?(?− → 4?−3?+)(?°)?{sub?}

A search for the decay of the {tau} lepton to five charged and two neutral pions is performed using data collected by the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider. The analysis uses 232 fb{sup -1} of data at center-of-mass energies on or near the {Upsilon}(4S) resonance. We observe 10 events with an expected background of 6.5{sub -1.4}{sup +2.0} events. In the absence of a signal, we set the limit on the branching ratio {Beta}({tau}{sup -} {yields} 3{pi}{sup -}2{pi}{sup +}2{pi}{sup 0}{nu}{sub {tau}})

Abstract: A search for the decay of the tau lepton to rare multi-pion final states is performed using the BABAR detector at the PEP-II asymmetric-energy ee− collider. The analysis uses 232 fb−1 of data at center-of-mass energies on or near the Upsilon(4S) resonance. In the search for the tau− -> 5pi−2pi2pi0nu[tau] decay, we observe 10 events with an expected background of 6.5+2̇0−1.4 events. In the absence of a signal, we calculate the decay branching ratio upper limit B(tau− -> 5pi−2pi+2pi0nu[tau]) 3.4x10−6 at 90% confidence level. This is more than a factor of 30 improvement over the previously established limit. In addition, we search for the exclusive decay mode tau− - 2omega.pi−nu[tau] with the further decay of omega -> pi−pi+pi0. We observe 1 event, expecting 0.4+1̇0−0.4 background events, and calculate the upper limit B(tau− -> 2omega.pi−nu[tau])